Explain what to meant by efflorescence? Solubility: The solubility of the sulphates in water decreases down the groups i.e. 2. CaSO4 .2H2O For example, a typical Group 2 carbonate like calcium carbonate decomposes like this:. 1. The carbonates of alkaline earth metals also decompose on heating to form oxide and carbon dioxide. (a) Alkali metals, Question 9. (c) Na2CO3 .10H2O. Which alkali metal ion forms largest hydrated ion in aqueous solution? (b) Lithium (d) KOH, Question 86. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to Answer: The reactivity of alkali metals increases from Li to Cs. (a) alcohol It is used in the manufacture of soap, paper, artificial silk and a number of chemicals. (a) Beryllium It alloys with aluminium to improve its mechanical, fabrication and welding property. (u) potassium – violet (3). (b) sodium (c) Beryllium Answer: (a) +1, Question 11. 2. The reproducible grey colour is due to a minor contribution from intervalence bands resulting from the (b) Ca Lithium shows diagonal relationship with (a) Beryllium The metal whizzes around the surface of water. (a) burnt alum (b) Lithium + lead, Question 81. List-II Mention the uses of beryllium. Based on this, NaOH is much more soluble due to exothermic nature than sodium chloride. Sodium carbonate decahydrate commonly known as washing soda Na2CO3. Lithium forms only monoxide, sodium forms the monoxide and peroxide and the other elements form monoxide, peroxide and superoxides. X forms X2SO2. 2MO2 + 2H2O → 2M+ + 2OH– H2O2 + O2. Which is used in dehydrating oils? (b) white metal bearings Li2CO3 + ∆ → Li2O + CO2↑ (a) CaCO3 (c) Liquid Na metal, Question 85. Similarities between beryllium and aluminium: Question 40. Answer: Question 53. Go to our Potassium is lighter than sodium. Plaster of paris Hydroxides of beryllium are in nature. Answer: (b) +2 (c) (i) and (iii) Their carbonates are soluble in water except Li. (c) acidic (d) heating calcium oxide with carbon For reproduction of material from all other RSC journals and books: For reproduction of material from all other RSC journals. Why group 2 elements are called alkaline earth metals? Answer: Answer: Question 4. Answer: (ii) Superoxides of alkali metals are blue in colour. Answer: Question 16. Answer: (b) quick lime (b) Gypsum, Question 60. The metal present in deposits of nitre is …………… Question 26. Hydration energy of Li+ is more and hence Li+ is stabilized in aqueous medium. 3. (a) Ca2+ ions are not important in maintaining the regular beating of the heart (ii) Lithium is a very soft metal and even it can be cut with a knife. The magnitude of lattice enthalpy is quite small in case of sodium and potassium compounds, hence they are readily dissolved in water, when compared to magnesium and calcium compounds. When gypsum is added to cement by mixing with an adequate quantity of water, it forms a plastic mass that gets into a hard solid in 5 to 10 minutes. These rules are to be applied in the order given. 1. Uses of NaHCO3. Question 34. (b) Beryllium (b) Lithium + aluminium Prove that gypsum is a natural insulator. Question 14. Why is LiF almost insoluble in water, whereas LiCl soluble not only in water but also In acetone? (b) Mg2+ ions are important in the green parts of the plants List-I All the carbonates of alkaline earth metal are more soluble in the presence of CO 2 due to the formation of corresponding bicarbonates. (d) CaCO3.MgCO3 B. Which of the above statements is/are not correct. Answer: Question 37. (b) [noble gases] ns2 np6 Superoxide O2- has 3 electron bond. Question 73. (b) Na+, K+, Question 24. Answer: The carbonates (M 2 CO 3) of alkali metals are remarkably stable upto 1273 K, above which they first â¦ Why are alkali metals always univalent? Answer: Answer: (b) strontium, Question 30. Liquid Na metalli Alkali metal hydroxide being basic in nature react with oxoacid ( such as H 2 CO 3), H 3 PO 4 HNO 3, H 2 SO 4 etc.) (a) KO2, Question 77. (b) CaCO3 1. Therefore, the hydroxi des and carbonates of these metals are only sparingly soluble in water. Alkali metals hydroxides are highly basic in nature. X-ray detector Alkali metals have only one valence electron per metal atom. (c) Potassium (d) (ii) only (b) Na+, K+ It is used in the textile industries for mercerising cotton fabrics. Answer: Explain the action of sodium with water. Question 1. The exceptions are those containing Ag +, Hg +2, and Pb +2. Answer: (c) Magnesium Answer: (b) both assertion and reason are true but reason is not the correct explanation of assertion B. Magnesium Answer: (c) Radium Water in the human body as in the blood and inside cells, contain dissolved calcium ions. The order of decreasing ionisation enthalpy in alkali metals is (i) Na > Li > K > Rb (ii) Rb < Na < K < Li What are the elements present in group 2? Lithium is used to make electrochemical cells. Li2CO3 is a covalent compound, whereas Na4CO3 is an ionic compound. Which of the above statements is/are not correct? Answer: (d) (i) and (ii) (c) Na, K, Question 4. Consider the following statements. Hydroxides and oxides are basic in nature. Question 3. (c) Its salts are rarely hydrolyzed (b) potassium Answer: (a) According to Fazan’s rule, Li+ ion can polarise I– ion more than the F– ion due to bigger size of the anion. (c) Sr, Question 35. All the Group 2 carbonates are very sparingly soluble. They are generally soluble in water and stable towards heat. (d)sodium, Question 8. From Li to Cs, thermal stability of carbonates increases. Which one of the following is used in purification of sugar and as drying agent? Therefore it becomes very difficult to remove the second electron from the stable noble gas configuration, giving rise to very high second ionization energy values. (a) Caesium Assertion (A): Sodium hydrogen carbonate is used in baking cakes and pastries. Lithium cannot be used in making photoelectric cells because out of all the alkali metals, it has highest ionization energy and thus cannot emit electrons when exposed to light. Question 70. 9:31 (c) assertion is true but reason is false But carbonates of alkaline earth metals are insoluble in water. (c) Mg Which of the following fruits contain maximum of potassium? On the other hand, in lithium chloride (LiCl) the lattice enthalpy is comparatively very small. (b) +2, Question 36. Describe Solvay process (or) how is washing soda (or) sodium carbonate prepared in industries? A. BeCO 3 is least stable and BaCO 3 is most stable. Atomic and ionic radii of alkaline earth metals are smaller than alkali metals, on moving down the group, the radii increases. Magnesium atom has small size so electrons are ’ strongly bound to the nucleus. Statement-II: Since BeCl2 is a covalent compound, it is soluble in organic solvent. Magnesium carbonate (the most soluble one I have data for) is soluble to the extent of about 0.02 g â¦ Answer: The name ‘Blue John’ is given to which of the following compounds? The heat evolved increases the stability. Hint: Prove this statement. Which of the above statements is/are not correct? Hint: Soluble alkaline metal carbonate compounds. (d) Statement-I is wrong but statement-II is correct. The carbonates (M2CO3) of alkali metals are remarkably more stable up to 1270 K above which they first melt and then decompose to form their oxides, whereas Li2CO3 is less stable and (c) Barium Hint: Answer: Question 31. Explain with equation. Question 1. 1. (s) strontium – crimson red (5) (d) Calcium (d) lilac (c) Na2CO3 Answer: (b) dead burnt plast, Question 63. Alkali Metals: Question 6. When the alkali metals salts moistened with concentrated hydrochloric acid are heated on a platinum wire in a flame, they show characteristic coloured flame. Answer: Among the following, which is the fifth most abundant element? It is used in the purification of bauxite and petroleum refining. (iii) Beryllium has low electronegativity and very low ionization enthalpy as compared to other alkaline earth metals. (ii) MgO is weakly basic. Answer: (a) Magnesium How is it obtained? (b) Lattice enthalpy of LIF is maximuni among all the alkali metal halides. Which one of the following gives red colour in flame test? Answer: (b) NaHCO3 IE1of alkaline earth metals are higher than that of alkali metals, but IE2 of alkaline earth metals are smaller than that of alkali metals. Alkali metals are so reactive and they have to be stored under oil. 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Temperature whereas Na2CO3 at higher temperature, barium and Radium Grignard reagent in organic solvents convert the water... Dead burnt Plaster ’ gas configuration the monoxide and not the correct explanation of statement-I of!, and become basic melts are never found in free supply of air X-ray tubes turns milky due to attraction. And coins Li to Cs, due to lower ionization enthalpy down the group because of their low ionization of! Be stored under oil that sodium hydroxide is electrolysed for extraction of sodium carbonate reagent used in baking a..., rises to the surface of the following is used in photoelectric cells Instructions for using Copyright Clearance Center for! Television and other electronic tubes lime mixed with soda gives solid soda lime hydroxide ) 2 CaSO4... The cations have smaller sizes and more magnitude of positive charge the answer limited amount energy. The least thermally stable ] ns2 plays an important role in agriculture a! 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