(d) p – 6, q – 5, r – 4, s – 3, t – 1,u – 2 Explain why can alkali and alkaline earth metals not be obtained by chemical reduction method. (d) Mangoes Answer: Question 17. Question 4. (c) Bananas 1. (a) MgSO4.7H2O (A) reacts with water to form (C) with liberation of hydrogen compound (D). (b) CaSO4.½H2O, Question 64. Answer: Copper and chlorine compound makes a blue firework. (b) Ionization energy : Li > Na > K > Rb In all cases the Ref. Give the systematic names for the following: Question 33. Question 26. Question 57. Fetching data from CrossRef. Answer: Question 17. (a) [noble gas] ns2 Answer: Prove that calcium oxide is a basic oxide. (d) 2CaSO4.2H2O (b) Lithium, Question 84. (d) NaHCO3 Question 27. In which process, fused sodium hydroxide is electrolysed for extraction of sodium? (b) Cs, Question 87. (c) (ii) and (iii), Question 17. Gd-doped ceria electrolytes (GDC, 10 at.% Gd) were prepared using a eutectic mixture of Li and Na carbonates as sintering aid (NLC - 0, 1, 3 and 5 mol%), using two processing routes (ceramic and chemical). 2. Magnalium – A mixture of the alkaline earth metal magnesium and aluminium boosts all fire works colours, particularly makes the blue brighter. For example,Li2CO3 +heat -> Li­2O +CO2MgCO3 +Heat -> MgO +CO2Na2CO3 +heat -> no effect.The stabilities of carbonates of alkaline earth metals increase on … D. Strontium. The main pigment in plants is chlorophyll which contains …………… The most common oxidation state of alkali metals is …………. Li < K< Na < Rb < Cs All the compounds are crystalline solids and their solubility in water is guided by both lattice enthalpy and hydration enthalpy. (c) CaSO4.2H2O, Question 61. of the whole article in a thesis or dissertation. 2. (c) NaOH State as to why Question 4. (a) lithium Li+ forms largest hydrated cations because it has the highest hydration energy. Lithium cannot be used in making photoelectric cells. 1. At high temperatures carbonates begin K, Rb and Cs gave super oxides. (b) CaNCN (c) Magnesium Answer: Ca(OH)2 + CO2 → CaCO2 + H2O, Question 37. 1. (d) Beryllium List-II It is used for the preparation of many inorganic compounds such as NaOH and Na. Which of the above statements is/are not correct? (d) rubidium (d) none of these (a) Cd All the bicarbonates (except which exits in solution) exist as solids and on heating form carbonates. 2. Answer: For e.g. Question 1. Answer: (b) both assertion and reason are true but reason is not the correct explanation of assertion Washing soda Alkali metals dissolve in liquid ammonia to form blue and conducting solution. Gypsum is used in the production of Plaster of Paris, which is used as a sculpting material. (d) (i) and (iii) (v) Heating calcium carbonate (d) BaO2 (b) Rb+ Therefore, these are soft and have low melting point. Which of the following compounds will not evolve H2 gas on reaction with alkali metals? This means that their lattice enthalpies are more, when compared to the sodium and potassium compounds. (b) basic Why? (a) zero Ca2+ ion plays an important role in maintaining regular heart beat. Answer: Answer: Lithium shows diagonal relationship with (b) Liquid helium Statement-II: Since BeCl2 is a covalent compound, it is soluble in organic solvent. (c) assertion is true but reason is false All the Group 2 carbonates are very sparingly soluble. Which of the following is used in devising photoelectric cells? List out the uses of magnesium. Answer: B. Answer: It is used in the textile industries for mercerising cotton fabrics. Answer: Answer: (b) magnesium (diagram pending), Question 9. There is little data for beryllium carbonate, but as it reacts with water, the trend is obscured. 8) While the hydroxides and carbonates of sodium and potassium are readily soluble in water, the corresponding salts of magnesium and calcium are only sparingly soluble. Answer: Question 14. Alkali metals exhibit +1 oxidation states in their compounds. How alkali metals react with oxygen? C. NaHCO3 Answer: (d) Li2CO3 Hint: (iii),The second ionization enthalpy of alkali metals are zero. On the other hand, in lithium chloride (LiCl) the lattice enthaipy is comparatively very small. (ii) Calcium nitrate acts a coagulator in making tofu. (6) Sulfates are soluble except for calcium and barium. Oxygen partial pressure influences uranate SiO3 NaOH As observed in alkali metals, beryllium shows a diagonal relationship with aluminium. The sulphates of alkaline earth metals are all white solids. (c) kerosene. Hint: (d) Sr ‘Blue john’ – CaF2 (A variety of fluorite), Question 23. The distinctive character of beryllium is mainly due to its small size, high electronegativity and high polarizing power, when compared to other elements in the same block. (iv) Solid potassium hydroxide with CO2 (b) Na and K impart colour to the flame but Mg does not. When carbon dioxide is passed through lime water, it turns milky due to the formation of calcium carbonate. Within the group, as we go down, the ionization enthalpies of alkali metals decreases due to the increase in atomic size. 2. Answer: A corresponding trend in the slopes of the acidic solubility also How CO2 reacts with it? Write about the important uses of calcium. C. Dentistry For alkali metals, which one of the following trends are incorrect? Explain the action of halogen with alkaline earth metals. Na + H2O → NaOH + ½H2 The reducing property of alkali metals follows the order 1. CaSO4 .2H2O Hint: Answer: (a) Magnesium chloride (ii) Lithium carbonate is more soluble than sodium carbonate in water. (b) CaN2 As the electrons returns to their normal level, they release their extra energy as a colourful burst of light. Question 6. This may take some time to load. H2O (a) CaSO4.2H2O Answer: Chemical properties of alkali metals: Alkali metals are highly reactive in nature. Question 27. Getter in vacuum tubes How is gypsum synthesized? (b) Sodium Therefore, the hydroxi des and carbonates of these metals are only sparingly soluble in water. Why alkali metals and alkaline earth metals are called s-block elements? Consider the following statements. C. Magnesium (a) [noble gases] ns1 All the alkali metals on exposure to air burn vigorously, forming oxides on the surface of the metals. with lead, lithium is used to make white metal bearings for motor engines, with aluminium to make aircraft parts and with magnesium to make armour plates.It is also used in thermonuclear reactions. It is used as a common salt (or) table salt for domestic purpose. Lithium directly react with carbon to form an ionic compound lithium carbide. Question 18. (b) dead burnt plast, Question 63. The main pigment for the absorption of light in plants is chlorophyll which contains magnesium. Mild antiseptic Answer: Question 37. 7. Gypsum is formed, due to evaporation, sulphur present in water bonds with oxygen to form a sulphate. (d) Francium Question 60. The solubility of metal halides depends on their nature, Lattice enthalpy and hydration enthalpy of the individual ions. Answer: (c) Baking soda, Question 91. Answer: Gypsum is usually white, colorless or grey in colour. Gypsum can also be synthesized from coal-fired power plants, as a by-product of flue-gas de suiflirization. Question 11. Hint: This occurs because in alkali metals the second electron is to be removed from a cation, which has already acquired a noble gas configuration. 1. Answer: These ions perform important biological functions such as maintenance of ion balance and nerve impulse conduction. D. Cement Casts of statues (d) Ca(HCO3)2 D. Rubidium The general molecular formula of rock salt or table salt is ………. (d) Barium Answer: Potassium reacts even more violently. Question 13. Prove this statement. Answer: Question 53. Answer: Question 39. (a) both (A) and (R) are correct and (R) is the correct explanation of (A). Consider the following statements. Answer: Alkali metal oxides M2O, M2O2 and MO2 are easily hydrolyzed by water to form the hydroxides Above 373K, the monohydrate becomes completely anhydrous and changes to a white powder called soda ash. Find the wrong statement ………… (b) NaCl, Question 10. Explain. (c) high, Question 12. This phenomenon is called as efflorescence. (c) Its salts are rarely hydrolyzed Why are lithium salts commonly hydrated and those of the other alkali metal ions usually anhydrous? The calcium concentration in plasma is regulated at about 100 mgL. (b) strontium (d) Sodium + lithium B. Barium Answer: B. Ca(OH)2 Answer: Question 28. Physical properties of alkali metals : Question 20. Which one of the following is covalent in character? (iii) Rubidium with oxygen gas Answer: (b) both assertion and reason are true but reason is not the correct explanation of assertion (a) iron List-I Thus they need large amount of energy for excitation of electrons to higher energy levels, which is not possible in Bunsen flame. (b) CaF2 Answer: (c) rubidium How would you explain the following observations? Answer: List-II Answer: (a) Beryllium (c) CsBr The thermal stability of carbonates increases with the increasing basic strength of metal hydroxides on moving down the group.Thus the order is The bicarbonates of all the alkali metals are known. (b) Ca(OH)2 formally request permission using Copyright Clearance Center. Answer: All the alkaline earth metals combine with halogen at elevated temperature to form their halides. (b) methane BeCl2 (vapour) D. Coolant in nuclear reactor For e.g., Be + Cl2 → BeCl2. Explain the action of sodium with water. Answer: Question 46. Sodium hydroxide being a strong base, completely dissociated in aqueous medium. (b) Lithium + aluminium (a) CaSO4.2H2O (d) K+ Answer: 4Li + O2 → 2Li2O (Lithium monoxide) (ii) Solubility : All the carbonates of alkali metals are generally soluble in water and their solubility increase rapidly on descending the group. Corresponding authors, a (a) Ca(CN)2 This is known as retrograde solubility, which is a distinguishing characteristic of gypsum. How this changes along the group? Draw the structure of BeCl2 in different physical states. Some of the Group 2 metal halides are covalent and soluble in organic solvents. Your email address will not be published. Magnesium (b) Li. Why? (s) Strontium – (4) Apple green (d) sodium (b) CaF2 Write the chemical equations for the reactions involved in Solvay process of preparation of sodium carbonate. 1. Answer: 1. What is meant by retrograde solubility? Consider the following statements. The suspension of slaked lime in water is known as (NEET Phase – II) Its alloys with nickel which readily emits electrons hence used in electron tubes and in spark plug electrodes. It alloys with aluminium to improve its mechanical, fabrication and welding property. (d) Calcium, Question 29. Answer: Answer: Question 26. Answer: Question 29. Answer: It is obtained by heating gypsum at 393 K. Question 42. (b) dead burnt plast Question 24. (a) Lithium 4. Your email address will not be published. Answer: (c) Ca3(PO4)2 in the refining of titanium in the “Kroll” process. Match the list-I and list-II using the correct code given below the list. Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals. Why is Li2CO3 decomposed at a lower temperature whereas Na2CO3 at higher temperature? Answer: (a) Nitrates (b) Carbonates (c) Sulphates. Among the following pairs. Answer: Lithium forms only monoxide, sodium forms the monoxide and peroxide and the other elements form monoxide, peroxide and superoxides. Answer: (c) gypsum plaster Explain how alkali metal oxide reacts with water? Answer: (d) magnesium, Question 66. (iii) Calcium plays an important role in neuromuscular function, interneuronal transmission and in blood coagulation. (a) CaO Why is Li2CO3 decomposed at a lower temperature, whereas Na2CO3 at higher temperature? The solutions are paramagnetic and on standing slowly liberate hydrogen resulting in the formation of amide. What are the uses of potassiunt and its compounds? Due to small size, the ionization enthalpies of Be and Mg are much higher than those of other alkaline earth metals. (b) Statements-I and II are correct and statement-II is the correct explanation of statement-I. Beryllium halides are covalent whereas magnesium halides are ionic why? Calcium. Compare the alkali metals and alkaline earth metals with respect to –. occurs and again the possible routes and products are discussed. List-II Answer: (d) both assertion and reason are false (c) kerosene Which of the above statements is/are not correct? C. CaSO4 .2H2O Answer: (a) Epsurn If you are the author of this article you do not need to formally request permission C. Gypsum (b) low As a de oxidizer, desulfurizer or decabonizer for various ferrous and non-ferrous alloys. Answer: (c) blue (c) CaCO3 2. Rock salt is major source of …………. Alkali metals are highly electropositive in nature. It is formed as mineral rich water, rises to the surface through capillary action and then evaporates. Question 62. Which of the above statements is/are not correct? from the dissolution of uranates, but gave grey melts that became yellow only on heating above 600°C. Which one of the following is used in toothpaste, shampoo and hair products? (b) CrO5 (d) lilac What happens when excess of CO2 reacts with calcium carbonate? The addition of limited amount of water breaks the lump of lime. What are the distinctive behaviour of beryllium? ½2H2O Sodium reacts so rapidly with water with the evolution of heat. (d) both assertion and reason are false it in a third party non-RSC publication you must When it drops back to its actual energy level, the excess energy is emitted as light whose wavelength is in the visible region produces colour. Which of the following is the least thermally stable? (a) +1, Question 11. 3. in High temperature: Question 18. Carbonates decompose to form oxide, when heated to high temperatures. Answer: (ii) Beryllium does not have d-orbitais in its valence shell. The half life period of francium is …………. The Solvay process is represented by the below chemical equations: Question 29. (a) Beryllium 2Na + 2H2O → 2NaOH + H2↑ + heat, Question 16. (d) Gypsum plaster Deoxidiser in copper refining Answer: (ii) Lithium is a very soft metal and even it can be cut with a knife. Spodumene and lepidolite are the minerals of ………… It combines with acidic oxides at high temperature. A colourless solid substance (A) on heating evolved CO2 and also gave a white residue, soluble in water. Answer: (c) Limestone (d) amphoteric Answer: So, solubility should decrease from Li to Cs. Answer: (i) Lithium metal with nitrogen gas Sodium Answer: A. Beryllium (d) (i) and (ii), Question 20. (b) sodium (b) Statements-I and II are correct but statement-II is not the correct explanation of statement-I. Answer: possible dissolution routes of mono- and diuranates are discussed. (c) Down process Information about reproducing material from RSC articles with different licences 1. Efflorescence is the formation of powdery deposit on the surface of rock as a result of loss of moisture or water on exposure to air. Solubility of carbonates decreases down the group. (d) Ca(HCO3)2 M + (x + v)NH3 → [M(NH3)x]+ + [e(NH3)y]– Answer: How sodium metal reacts with – It is used in the manufacture of soap, paper, artificial silk and a number of chemicals. Sodium carbonate is highly used in laundering. Among the alkaline earth metals, which is radioactive in nature? B. Ca(OH) 2 is slightly soluble. (a) Statements-I and II arc correct but statement-II is not the correct explanation of statement-I. in the removal of sulphur from iron and steel. (b) water Answer: (d) francium When caesìum salt is subjected to flame test, the colour produced is Answer: (c) Density : Li < Na < K < Rb Plaster of paris Correct statement is beryllium salts are easily hydrolyzed, Question 18. The carbonates tend to become less soluble as you go down the Group. What happens when potassium Is treated with water? Crimson red But carbonates of alkaline earth metals are insoluble in water. Correctly match the list-I and list-II using the code given below the list. A. (a) Nitrates (b) Carbonates (c) Sulphates. (b) Pt Answer: Question 6. Group I elements form strong hydroxides on reaction with water which are strong alkaline in nature. (a) +4 Hint: 2. Question 21. (c) blue (d) heating calcium oxide with carbon What are the uses of sodium and its compounds? List-II Which of the following alloy is used in making white metal bearings for motor engines? (c) CaSO4.2H2O 3. Why are potassium and caesium. Answer: Write about the uses of sodium bicarbonate. (c) Calcium D. Barium. Question 74. Explain the various periodic trends in the alkali metals down the group. (c) CaCl2 (b) MI < MBr < MCl < MF (a) MgCl2 V. A. Volkovich Answer: (c) Na2O2 3. Celestite and strontianite are the ores of ……….. (b) Mg2+ ions are important in the green parts of the plants The name ‘Blue John’ is given to which of the following compounds? Answer: Answer: It plays an important role in agriculture as a soil additive, conditioner and fertilizer. Write balanced chemical equation for each of the following chemical reactions. Sacrificial anode Alkali metals have low ionization enthalpies. Mention the uses of Plaster of Paris. Potassium ions are the most abundant cations within cell fluids, where they activate many enzymes, participate in the oxidation of glucose to produce ATP and with sodium, are responsible for the transmission of nerve signals. P4O10. Potassium and caesium have much lower ionization enthalpy than that of lithium. CaCO3 + CO2 + H2O → Ca(HCO3)2 (Calcium bi-carbonate). Statement-II: Due to its lowest ionization energy, cesium is considered as the most electropositive element. This happens mostly in arid areas or desert terrains, where there is rapid loss of water. Alkali Metals: Question 6. Lorimer, Alkali Metal and Ammonium Halides in Water and Heavy Water (Binary Systems) (1991) Download (PDF) Volume 48: F. Getzen, G. Hefter and A. Maczynski, Esters with Water. M (OH) 2 + H 2 SO 4 → MSO 4 + 2H 2 O MCO 3 + H 2 SO 4 → MSO 4 + CO 2 + H 2 O . Thus Li+ has more covalent character than LiF. (b) Smaller the size (internuclear distance), more is the value of lattice enthalpy since internuclear distance is expected to be least in the LiF. (c) Statement-I is wrong but statementII is correct. Why alkali metals are soft and have low melting points? (ii) Superoxides of alkali metals are blue in colour. (c) Transmitting nerve signals, Question 25. Thus, the second electron can be removed more easily in the case of group 2 elements than in group I elements. Question 21. It is otherwise called as Glauber’s salt. to access the full features of the site or access our. Solubility of hydroxides: Consider the following statements. (b) Mg, Question 43. (a) superoxide and paramagnetic In the case of alkaline earth metals, the second electron is to be removed from a monovalent cation, which still has one electron in the outermost shell. (c) Lithium on being heated in air mainly forms the monoxide and not the peroxide. Anode : 2OH– → H2O + 1/2 O2 + 2e–. Question 29. (iii) Gypsum plays an important role in soap making. in the manufacture of sodium carbonate and slaked lime. From Li to Cs, thermal stability of carbonates increases. Be(OH)2 is amphoteric in nature as it reacts with both acid and alkali. (d) Barium (ii) MgO is weakly basic. Hint: Question 12. Since group 1 hydroxides and carbonates due to large size contain higher hydration energy than the lattice energy so, they are easily soluble in water. , T. R. Griffiths, D. J. RbO2 is a super oxide which contains Rb+ and O2- ions. Alkali metals due to lower ionization enthalpy are more electropositive than the corresponding group 2 elements. This reduces the size of atomic and ionic radii. Fray and R. C. Thied, School of Chemistry, Uniersity of Leeds, Leeds, UK, Department of Materials Science and Metallurgy, Uniersity of Cambridge, Pembroke Street, Cambridge, UK, British Nuclear Fuels plc., Sellafield R & D, Sellafield, Seascale, Cumbria, UK, Instructions for using Copyright Clearance Center page. e.g., MgCl2 and CaCl2 exist as MgCl2.6H2O and CaCl2.6H2O, while NaCl and KCl do not form such hydrates. The aqueous solution of calcium hydroxide is known as lime water and a suspension of slaked lime in water is known as milk of lime. Question 11. Therefore lithium chloride dissolves in water. Deficiency of magnesium results into convulsion and neuromuscular irritation. (b) Lithium + lead, Question 81. What is slaking of lime? Because it decomposes on heating to generate bubbles of carbon dioxide, leaving holes in cakes or pastries and making them light and fluffy. A detailed investigation of the dissolution of alkali metal uranates in carbonate melts under the influence of CO 2 and O 2 partial pressures has been performed between 450 and 800°C. What are the common physical and chemical features of alkali metals? Therefore, alkaline earth metals are harder than alkali metals. 3. Question 30. 1. Answer: (a) NaI C. Potassium (c) Na, K (a) (i) only Answer: 2K + 2H2O → 2KOH + H2↑ + heat. Alkali metals are so reactive and they have to be stored under oil. LiCl is soluble in water whereas LiBr and LiI are soluble In organic solvent. (a) Grapes Which of the following has highest hydration energy? (d) Li2CO3 Alkali metals dissolve in liquid ammonia to form blue and conducting solution. This reaction being reversible, CO2 is removed as soon as it is produced to enable the reaction to proceed to completion. Department of Materials Science and Metallurgy, Uniersity of Cambridge, Pembroke Street, Cambridge, UK, c Alkali metals are stored under oil. (c) CaSO4.2H2O, Question 57. (a) heating calcium in oxygen Most chlorides (Cl-), bromides (Br-) or iodides (I-) are soluble. 10H2O. (d) Li is the best reducing agent in aqueous solution. Beryllium oxide is heated with carbon and chloride to get BeCl2. For example, a typical Group 2 carbonate like calcium carbonate decomposes like this:. Benzene can be used to store an alkali metal, because other substances react with alkali metal as below: Write a note about physical appearance of gypsum. Explain with equation. (c) Zn Answer: Magnesium carbonate (the most soluble Group 2 carbonate) has a solubility of about 0.02 g per 100 g of water at room temperature. Answer: Question 47. Missile construction Statement-I: BeCl2 is soluble in organic solvent. 2M + X2 → 2M+X– (M = Li, Na, K, Rb and Cs) (X F, Cl, Br and I), Question 15. List-I of oxygen-deficient polyuranates under these conditions. It is used in the manufacture of glass, paper and paint. Li+ > Na+ > K+ > Rb+ > Cs+. (b) ethanol (c) CaSO4.2H2O Answer: 2. Explain the action of soda lime with – 2MO2 + 2H2O → 2M+ + 2OH– H2O2 + O2. 3. Solubility of hydroxides of alkali metals are higher than that of alkaline earth metals. (a) CaCO3 (b) (ii) only Answer: Question 71. (c) KCI 1. Potassium chloride is used as a fertilizer. (c) Statement-I is correct but statement-II is wrong. Question 51. (b) Coinage metals (d) Al(OH)3 (a) Ca2+ ions are not important in maintaining the regular beating of the heart Question 19. Describe briefly the biological importance of calcium and magnesium. When the alkali metals salts moistened with concentrated hydrochloric acid are heated on a platinum wire in a flame, they show characteristic coloured flame. 6. Why are alkali metals always univalent? An alkali metal (x) forms a hydrated sulphate, X2SO2. (b) Magnesium (a) Be, Question 42. Atypical 70 kg man has 90g of Na and 170 g of K. 5. Answer: So, group 1 elements are called alkali metals. List-I C. Softening of hard water Reactivity of alkali metals with halogen increases down the group because of corresponding increase in electropositive character. (a) Alabaster, Question 58. Heating the carbonates. The loosely held “s” electron in the outermost shell of these elements make them as the most electropositive metals. (c) Due to the small size of Li+ it has a strong positive field, which attracts the negative charge so strongly that it does not permit the oxide ion (O2-) to combine with another oxygen atom to form peroxide ion. (b) Mg Lattice energy of BeO is comparatively higher than the hydration energy. Which one of the following is known as natural insulator? (a) Li+, Rb+ Answer: in alkali metals, as we move down the group. Mention the uses of lithium and its compounds. (b) CaCl2 Ca(OH)2 + CO2 → CaCO3 + H2O. 3. 2. Answer: Both the cation and the electron combine with ammonia to form ammoniated cation and ammoniated electron. Hydroxides and oxides of beryllium are amphoteric in nature. These ions are involved in making muscles move and in sending electricity around the brain and along the nerves. Francium is highly radioactive element in group. (b) p – 1, q – 2, r – 4, s – 5, t – 6, u – 3 (a) Iron This happens because the alkali metal atom readily loses the valence electron in ammonia solution. (c) Its salts are rarely hydrolyzed (c) electrochemical cell 4. Answer: Copper and chlorine compounds makes blue fire work Why? Which of the following ions arc more responsible for transmission of nerve signal? (a) cesium Question 19. The sample holder in X-ray emission studies is made of beryllium. (c) (i) and (iii) Question 34. (b) white metal bearings Compare the properties of beryllium with the other elements in the same group. 2. Their carbonates are soluble in water except Li. (a) Alkali metals, Question 9. Answer: (a) Beryllium Question 1. The exceptions are the alkali metal hydroxides and Ba(OH) 2. Answer: (ii) The calcium concentration in plasma is regulated at 10 mg L-1. The eighth most abundant among the alkaline earth metals is …………. C. Calcium (d) Statement-I is wrong but statement-II is correct. NaHCO3 (a) K2CO3 Why? (a) NaHCO3 is used as an ingredient in baking. They make the teeth and bone hard. Group-1 (alkali metals) carbonates M 2 CO 3: Li 2 CO 3, Na 2 CO 3, K 2 CO 3 etc., bicarbonates MHCO 3: LiHCO 3, NaHCO 3, KHCO 3 etc., Group-2 (alkaline earth metals) carbonates MCO 3: MgCO 3, CaCO 3, BaCO 3 etc., bicarbonates M(HCO 3) 2: Mg(HCO 3) 2, Ca(HCO 3) 2 etc., p-block elements carbonates _ Tl 2 CO 3 and PbCO 3: Transition elements carbonates _ (c) green They have two electrons in the valence shell and their electronic configuration is [noble gas] ns. (c) CaC2N2 Question 70. B. CaCO3 Which metal is used as radiation windows for X-ray tubes? (b) Na+, K+ to form different slats such as metal carbonates, bicarbonates, sulphates, nitrates, etc. 2% of an adult weight is made up of calcium. (b) Cs C. Strontium (c) + 1 (a) Statements-I and II arc correct and statement-II is the correct explanation of statement-I. The low solubiLity of LiF in water is due to its very high Lattice enthalpy (F– ion is very small in size). The correct order of density is The anomalous behaviour of lithium is due to the exceptionally small size of the atom and high polarizing power, which is a ratio of charge to radius and hydration energy. Answer: Question 65. Question 43. Consider the following statements. Li2CO3 is a covalent compound, whereas Na2CO3 is an ionic compound. Question 8. 2M + H2 → 2 M+H– (where M = Li, Na, K, Rb and Cs). Why beryllium has distinctive character? (a) Rb
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