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CHEMISTRY TODAY | APRIL ‘17 63
22. H 2 can be obtained from 28. The solubility in water of sulphates down the Be carbonates decreases in that order. The thermal stability of carbonates and sulphates of alkaline earth metals (D) Mixture of (S) increases from Be to Ba as we move from top to bottom stereoisomers in the group. A B C D (a) R P, S P Q, R 27. Which of the following metal carbonates (b) P P, S Q, R R de<strong>com</strong>poses on heating? (c) R P, S Q R (a) MgCO 3 (b) Na 2 CO 3 (c) K 2 CO 3 (d) Rb 2 CO 3 (a) the reaction of water with ionic hydrides (b) water gas by oxidation of CO into CO 2 (by steam) which can be easily removed by dissolving in H 2 O (c) electrolysis of water (d) reaction of NaOH with Zn. 76 23. Isotones of 32Ge are group is Be > Mg > Ca > Sr > Ba. This is due to (a) high heat of solvation for smaller ions like Be 2+ (b) increasing molecular weight (c) decreasing lattice energy (d) increase in melting points. Matrix Match Type 29. Match the molecules given in Column I with their 77 77 (a) 32Ge (b) 33 As (c) 77 34Se (d) 78 characteristics given in Column II. 34Se Column I Column II Integer Answer Type – (A) O 2 (P) Bond order 2.5 and paramagnetic 24. (B) N 2 (Q) Bond order 1.5 and paramagnetic + (C) N 2 (R) Bond order 1 and paramagnetic (D) B Total number of deuterium atoms in the final 2 (S) Bond order 3 and diamagnetic A B C D product is (a) Q S P R 25. How many of the following metals liberate (b) P S R Q dihydrogen from water either at room temperature (c) R P Q S or on heating? (d) Q S R P Zn, Mg, Na, Al, Ti, Cr, W 26. The equilibrium constant K sp for the given reaction 30. Match the terms given in Column I with the <strong>com</strong>pounds given in Column II. is found to be x × 10 –10 . Column I Column II AgCl (s) Ag + (aq) + Cl – (aq) (A) Markovnikov (P) HBr Using the data ∆G° f (AgCl) = –109.4 kJ, product ∆G° f (Ag + ) = 77.1 kJ and ∆G° f (Cl – HO 2 2 , hv ) = – 131.2 kJ. The value of x is (B) Anti- Comprehension Type Markovnikov (Q) BeO and Be(OH) 2 are amphoteric while the oxides and product hydroxides of other alkaline earth metals are basic. The solubility of hydroxides increases as we move down the group from Be to Ba but the solubility of sulphates and (C) Peroxide effect (R) Keys are published in this issue. Search now! J No. of questions attempted No. of questions correct Marks scored in percentage …… …… …… Check your score! If your score is > 90% EXCELLENT WORK ! You are well prepared to take the challenge of final exam. 90-75% GOOD WORK ! You can score good in the final exam. 74-60% SATISFACTORY ! You need to score more next time. < 60% NOT SATISFACTORY! Revise thoroughly and strengthen your concepts. 64 CHEMISTRY TODAY | APRIL ‘17
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Volume 26 No. 4 April 2017 Managing
Page 5 and 6:
(R) K[Co(NH ) (NO ) 4 ] 1. The volu
Page 7 and 8: 24. m-Bromoaniline can be prepared
Page 9 and 10: (a) (b) (c) (d) CH CH C CH CH CH C
Page 11 and 12: 20. (d) : CH 2 5 alk. KMnO 4 ( A) C
Page 13 and 14: 41. (a) : According to Gibbs’-Hel
Page 15 and 16: 5. Compound 'X' C 7 H 8 O, is insol
Page 17 and 18: (c) (d) O HC 2 O O HC 2 O O CH CH C
Page 19 and 20: 4. As 2 S 3 sol carries a negative
Page 21 and 22: 15. Cl CHONa + EtOH 2 5 Heat Possib
Page 23 and 24: (c) If θ = 10°, the charge underg
Page 25 and 26: (c) (d) NH 2 O heat NH HO 2 C CO 2
Page 27 and 28: (c) Dil. HCl followed by reaction w
Page 29 and 30: 33. Which of the following reaction
Page 31 and 32: Balz-Schiemann reaction : tetrauoro
Page 33 and 34: 26. (c) : HC 3 HC 3 -H O CH 2 3 H +
Page 35 and 36: 12. At equimolar concentration of F
Page 37 and 38: (a) 1s 2 , 2s 2 2p 6 , 3s 2 3p 6 3d
Page 39 and 40: Fraction of M present as M 2+ = 88
Page 41: 26. (b) : According to Gay-Lussac
Page 47 and 48: CONCEPT MAP PERIODICITY IN PROPERTI
Page 49 and 50: Class XII This specially designed c
Page 51 and 52: JEE MAIN / JEE ADVANCED / PETs Only
Page 53 and 54: CHEMISTRY MUSING SOLUTION SET 44 24
Page 55 and 56: Isothermal reversible expansion :
Page 57: (a) H 2 O/H + , BH 3·THF/H 2 O 2·
Page 61 and 62: 7. Predict the product for the foll
Page 63 and 64: 7. (d) : Cyclopropane is under seve
Page 65 and 66: 46. If the first and the (2n - 1) t
Page 67 and 68: 1 (a) 6 2 ms − (b) 4 2 (c) 7 m s
Page 69 and 70: tension, viscous force, weight but
Page 71 and 72: (a) HN 2 SO 3 H (b) (NH 2 ) 2 CO (c
Page 73 and 74: SOLUTIONS PAPER-I 1. (a) : The phot
Page 75 and 76: 11. (a, d) : As, F 1 = k 1 x, F 2 =
Page 77 and 78: Given that, at equilibrium, ⎛ n
Page 79 and 80: 2 ∫ 53. (3) : (| x− 2| + [ x])
Page 81 and 82: percentage change in v = 1 2 perce
Page 83 and 84: Again, c 2 a 2 b 2 = + + 2a⋅b
Page 85: 90 CHEMISTRY TODAY | APRIL ‘17
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