Unit5 Solutions qns

Unit5 Solutions qns - 1 QUEST TUTORIALS Head Office :...

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Unformatted text preview: 1 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 UNIT 5 SOLUTIONS 1. Conc. HCl has a density of 1.19 g.ml and is about 36.5% by weight HCl. The Molarity and normality of the solution is (a) 11.9 and 11.9 (b) 11.9 and 23.8 (c) 12.07 and 12.07 (d) 5.95 and 11.90 2. 100 ml of N/2 HCl 30 ml of N/10 HNO 3 and 75 ml of N/5 H 2 SO 4 are mixed together. The normality of the resulting acid solution is (a) 0.2 N (b) 0.4 N (c) 0.6 N (d) 0.8 N 3. The volume of 0.25 M H 3 PO 4 necessary to neutralised 25 ml of 0.30 M Ca(OH) 2 is (a) 8.3 ml (b) 20 ml (c) 50 ml (d) 40 ml 4. I 2 can be estimated quantitatively by titration with a standard solution of which one of the following (a) Na 2 SO 3 (b) Na 2 S 2 O 3 (c) Na 2 S (d) Na 2 SO 4 5. The mole fraction of C 6 H 6 in a solution containing 37.5 g of camphor in 39.0 g of benzene was 0.667. The molecular weight of camphor is found to be (a) 37.5 (b) 150 (c) 112.5 (d) 300 6. A certain aqueous solution contains ethanol and sucrose. If the mole-fraction of ethanol is 0.15 and that of sucrose is 0.43, what is the mole-fraction of water in the solution ? (a) 0.28 (b) 0.50 (c) 0.42 (d) none of these 7. The density of 1.68 MH 2 SO 4 is 1.102. The molality of the solution is (a) 1.68 (b) 0.84 (c) 3.6 (d) 1.79 8. 500 ml of 0.1 M solution of AgNO 3 are added to 500 ml of 0.1 M KICl, the concentration of nitrate ion in the resulting solution is (a) 0.05 (b) 0.10 (c) 0.20 (d) 0.01 9. In a certain binary solution, the molality is 0.0090 and the mole fraction of solute is 2.7 10 4 . The M.W. of solvent is found to be (a) 24.3 (b) 333 (c) 30 (d) none of these 10. For a dilute solution, the relation between molality (m) and the mole-fraction of solute (x 2 ) is given by (a) x 2 = Mw 1 /1000 m (b) x 2 = mMw 1 /1000 (c) x 2 = 100 m/Mw 1 where Mw 1 stands for the M.W. of (d) the solvent (e) the solute 11. The label on the bottle of H 2 SO 4 indicates 80% H 2 SO 4 by weight, density is 1.727; the molarity and normality of H 2 SO 4 is (a) 14.0 and 28.0 (b) 7.0 and 14.0 (c) 18.4 and 36.8 (d) 1.4 and 2.8 12. Naphtalein is fairly soluble in (a) water (b) ethyl alcohol (c) benzene (d) H 2 SO 4 13. Critical solution temperature of phenolwater system is 66C. It means (a) at 66C, phenol and water become completely miscible (b) at 66C, phenol and water separate with two layers (c) above 66C, phenol and water become miscible in all proportions (d) none of these 14. A solid (X) is added to a mixture of benzene and water. After shaking well, 10 ml of the benzene layer was found to contain 0.13 g of X while 100 ml of water layer contained 0.22 g of X. The value of distributions or partition co-efficient is (a) 0.059 (b) 0.59 (c) 59 (d) 5.9 15. A binary mixture which forms an ideal solution has all the following except (a) has only very weak interaction between solute and solvent molecules (b) can be separated into its two components by repeated distillation (c) has a vapour pressure intermediate between the vapour pressure of pure...
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Unit5 Solutions qns - 1 QUEST TUTORIALS Head Office :...

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