1. Aqueous solution of NH4X is acidic in nature, ‘X’ would not be the following-
OH, Cl, Br, I
Ans: OH
2. The molarity of 20% (W/W) NaOH solution is 5 M. The density of the solution is-
Ans: 1.0 g/ml
3. The freezing point of equimolal aqueous solutions will be highest for -
Ans: C6H12O6
4. Which of the following when added to ammonia buffer brings about greater change in its pH -
HCl, NaOH, Water, NH4OH
Ans: NH4OH
5. At 300 K the solute in 0.1 M K4 [Fe(CN)6] solution is 100% ionised. The osmotic pressure of the solution is -
Ans: 12.3 atm
6. The value of hydrolysis constant of Sodium acetate is (Ka of acetic acid is 2 × 10-5) -
Ans: 5 × 10-10
7. The pH of a buffer solution changes by 0.1 unit on the addition of 4 grams of NaOH. The buffer capacity is -
Ans: 4
8. Both the cation and the anion interact with water in the aqueous solution of the following Salt-
HCOOK, NH4Cl, CH3COONH4, CSI
Ans: CH3COONH4
9. 100 ml of solution contains 34.2 gm of Aluminium sulphate. The molarity of the solution is -
Ans: 1 M
10. When HCl gas is passed through NaCl saturated solution, NaCl is precipitated. This is due to -
Ans: Common ion effect
11. 'x' g Na2CO3 is present in 100 ml 'y' M Na2CO3 solution. The ratio of x and y is -
Ans: 10.6
12. The molality and molarity of an agueous solution are 1.0 m and 0.75 M respectively. The weight of solvent present in 10 ml of that solution is -
Ans: 7.5 g
13. For an aqueous solution density is less than 1 g/ ml. The relation between its molarity (M) and molality (m) is -
Ans: m > M
14. At certain high temperature TK, pH of 0.05 MBa(OH)2 is 11.6990. At TK, ionic product of water is -
Ans: 2 × 10-14 M2
15. Read the following statements
I) For the Salt Ag2S3 Ksp = 108S5
II) Among IIA Group hydroxides Be(OH)2 has lowest Ksp at 25°C.
III) The Molar solubility of PbI2 in 0.2 M Pb(NO3)2 solution in terms of ‘Ksp’ is [Ksp/0.8]1/2
Ans: All three
16. When equal volumes of following solutions are mixed, then precipitation of AgCl will occur only with (Ksp of AgCl = 1.8 × 10-10)-
Ans: 10-4 M Ag+1 and 10-4 MCl-
17. A small amount of HCl, is added to a buffer containing acitic acid and sodium acetate. The following reaction is responsible for constant pH of the solution?
Ans: CH3COO- + H+ --> CH3COOH
18. Which of the following 0.1 M solutions will have lowest pH?
CH3COOH, HCl, NH4OH, KOH
Ans: HCl
19. ‘X’ L of 10 N HCl and ‘Y’ L of 2 M HCl are mixed. Molarity of resultant solution is ‘Z’. X, Y and Z are respectively?
Ans: 6, 6, 6
20. Which of the following are not correct
A) Cl - is a Lewis acid
B) pH of 10-3 M HCl is 3
C) In acid solution pH < pOH
D) Bronsted - Lowry theory fails to explain basic nature of NH3
Ans: A, D