Q1. Mole fraction of solvent in 0.2 m binary aqueous solution of camphor (m = molality) (A) 0.996 (B) 0.004 (C) 0.96 (D) 0.976 Q2. Volume V1 ml of 0.1 M K2Cr2O7 is needed for complete oxidation of 0.678g N2H4 in acidic medium. The volume of 0.3 M KMnO4 needed for same oxidation in acidic medium will be 2 (A) V 5 (B) V (C) 113 V (D) can't say 5 1 2 1 1 Q3. Ocidation state of sulphur in Caro's acid, H2SO5 is (A) +8 (B) +6 (C) +3 (D) - 2 Q4. The molarity of Cl- in an aqueous solution which was (w/V) 2% NaCl, 4% CaCl and 6% NH4Cl will be (A) 0.342 (B) 0.721 (C) 1.12 (D) 2.18 Q5. The molar ratio of Fe++ to Fe+++ in a mixture of FeSO and Fe (SO ) having equal number of 4 sulphate ion in both ferrous and ferric sulphate is 2 4 3 (A) 1 : 2 (B) 3 : 2 (C) 2 : 3 (D) can't be determined Q6. How many mg of quick lime is required to remove hardness of 1 Kg of hard water having 366 ppm of HCO3 and Ca as the only cation ++ (A) 72 mg (B) 84 mg (C) 168 mg (D) 170 mg Q7. DNA has density 1.1 gm/ml and its molecular weight is 6 x 103 g/mol. Average volume occupied by its single molecule will be (A) 9.1 x 10-20cc (B) 9.1 x 10-21cc (C) 9.8 x 10-21cc (D) 9.6 x 10-20cc Q8. How many ml of 0.3M K2Cr2O7 (acidic) is required for complete oxidation of 5 ml of 0.2 M SnC2O4 solution (A) 3.33 ml (B) 2.22 ml (C) 11 ml (D) 4.44 ml Q9. In the balanced chemical reaction: aCrO 2 bFe(OH) 4H2O cCr(OH)3 dFe(OH)3 OH the value of a, b, c and d are respectively (A) 1, 4, 3, 1 (B) 1, 3, 1, 3 (C) 1, 3, 4, 1 (D) 3, 4, 3, 1 Q10. In which of the compound(s) Iodine has positive oxidation state (A) Iodoform (B) I2O5 (C) ICl (D) HIO3 Q11. For the conversion of 0.240 g NaH2PO4 in a solution to monohydrogen phosphate, 21.4 ml NaOH solution is needed. The molarity of NaOH solution will be (A) 0.093 (B) 0.93 (C) 0.087 (D) 0.083 Q12. 22.7 ml of N/10 Na2CO3 solution neutralises 10.2 ml of dilute H2SO4. Then the volume of water that must be added to 400 ml of same H2SO4 to make it exactly N/10 is (A) 245 ml (B) 484.6 ml (C) 480 ml (D) 490.2 ml Q13. The volume of NH3(at STP) needed to pass into 30 ml of 1N H2SO4 solution to bring down its strength to M/10 is (A) 0.5 litre (B) 636 ml (C) 537.6 ml (D) 540.3 ml Q14. 1.0 gm of a mixture of CaCO3 and NaCl reacts completely with 120 ml of N/10 HCl. The percentage of NaCl in the mixture is (A) 40% (B) 50% (C) 60% (D) 66% Q15. 50 g of 8% by mass NaOH is mixed with 100 g of 8% by mass of HCl, the resulting solution is (A) acidic (B) basic (C) neutral (D) strongly basis Q16. 0.62g Na2CO3 . xH2O completely neutralises 100 ml of N/10 H2SO4. The value of x muxt be (A) 1 (B) 6 (C) 8 (D) 10 Q17. How many litre of O3 at STP will be needed to completely oxidise 10 ml of 0.4M KI into I2 (A) 0.448 (B) 0.0448 (C) 4.48 (D) 2.24 Q18. How many moles of FeCr2O4 can be oxidised completely by 1 mole of KMnO4 in acidic medium. (A) 7 (B) 5 (C) 7/5 (D) 5/7 Q19. A sample of Ca3(PO4)2 contains 3.