Q.1
Which of the following is Bronsted acid as well as a Bronsted base?
  • a) BF3
  • b) NH3
  • c) H2O
  • d) Na2CO3
Q.2
The pKa of weak acid, HA is 4.The pKb of a weak base, BOH is 4.The pH of an aqueous solution of the corresponding salt, BA will be [ AIEEE 2008]
  • a)9.22
  • b) 9.58
  • c)4.79
  • d)7.01
Q.3
The molar solubility ( in molL-1) of a parinly soluble salt MX4 is 's" . The corresponding solubility product is Ksp, .'s' is given in terms of Ksp by the relation
  • a) s=(256Ksp)1/5
  • b) s=(128Ksp)1/4
  • c) s=(Ksp/128)1/4
  • d)s=(Ksp/256)1/5
Q.4
The pKa of HCN is 9.The pH of solution prepared by mixing 2.5 moles of KCN and 2.5 moles of HCN in water and making up total to 500 ml is ..[ IIT 1992]
  • a)9.30
  • b) 7.30
  • c)10.30
  • d)8.30
Q.5
An aqueous solution of sodium carbonate has a pH greater than 7 because
  • a) Carbonate ions react with H2O
  • b) Na+ ions react with water
  • c) It contains more hydroxide ions than carbonate ions
  • d) It contains more carbonate ions than H2O molecules
Q.6
The precipitate of CaF2 ( Ksp=1.7 ×10-10) is obtained when equal volumes of the following are mixed
  • a)10-4 M Ca2+ + 10-4 M F-
  • b) 10-2 M Ca2+ + 10-3 M F-
  • c)10-5 M Ca2+ + 10-3 M F-
  • d)10-3 M Ca2+ + 10-5 M F-
Q.7
The solubility product of salt having general formula MX2 in water is , 4 ×10-The concentration of M2+ ions in the aqueous solution of the salt is [ AIEEE 2005]
  • a) 2.0 × 10-6 M
  • b) 1.0 × 10-4 M
  • c)1.6 × 10-4 M
  • d)4.0 × 10-10 M
Q.8
hydrogen ion concentration in mol/L in solution of pH=5.4 will be [ AIEEE 2005]
  • a) 3.98 × 108
  • b) 3.88 × 106
  • c)3.68 ×10-6
  • d)3.98 × 10-6
Q.9
In the hydrolysis of salt of weak acid and weak base, the hydrolysis constant Kh is equal to [ orissa JEE 2003]
  • a)
    ch-8_qn-68choice_img_no1.png
  • b)
    ch-8_qn-68choice_img_no2.png
  • c)
    ch-8_qn-68choice_img_no3.png
  • d)
    ch-8_qn-68choice_img_no4.png
Q.10
The pKa of a weak acid (HA) is 4.The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is [ AIEEE 2007]
  • a)7.0
  • b) 4.5
  • c)2.5
  • d)9.5
Q.11
1M NaCl and 1M HCl are present in a na aqueous solution . the solution is [ AIEEE 2002]
  • a) Not a buffer solution with pH < 7
  • b) Not a buffer solution with pH >7
  • c)A buffer solution with pH < 7
  • d)A buffer solution with pH > 7
Q.12
Compound whose 0.1M solution is basic is .. [ IIT 1986]
  • a) Ammonium acetate
  • b) Ammonium chloride
  • c)Ammonium sulphate
  • d)Sodium Acetate
Q.13
The pH of a solution obtained by mixing 50ml of 0.4M HCl with 50ml of 0.2 M NaOH is
  • a) - log2
  • b) - log2×10-1
  • c) 1.0
  • d) 2.0
Q.14
The solubility of A2 X3 is y mol dm-Is solubility product is ..[ IIT 1997]
  • a)6y4
  • b) 64y4
  • c)36y5
  • d)108y5
Q.15
The pH at the equivalence point of titration may differ from 7.0 because of
  • a) The self ionization of water
  • b) Hydrolysis of the salt formed
  • c)The indicator used
  • d)The concentration of the standard solution
Q.16
The pKb for fluoride ion at 25°C is 10.83, the ionization constant of hydrofluoric acid at this temperature is ... [ IIT 1997]
  • a) 1.74 × 10-2
  • b) 3.52 × 10-5
  • c)6.57 ×10-4
  • d)5.38 ×10-2
Q.17
Hydrogen ion concentration of an aqueous solution is 1 × 10-4M. The solution is diluted with equal volume of water. Hydroxyl ion concentration of the resultant solution in terms of mol dm-3 is [ Karnataka CET 2001]
  • a) 1 × 10-8
  • b) 1 × 10-6
  • c) 2 × 10-10
  • d) 0.5× 10-10
Q.18
Which of the following can not act a a Lewis acid or Bronsted acid?
  • a)CCl4
  • b) SnCl4
  • c)AlCl3
  • d)BF3
Q.19
Solid Ba(NO3)2 is gradually dissolved in a 1.0 × 10- M, Na2CO3 solution. At what concentration of Ba2+ will a precipitate being to form ? Ksp for BaCO3=5.1 × 10-9) [ AIEEE 2009]
  • a) 4.1 × 10-5M
  • b) 5.1 × 10-5M
  • c) 8.1 × 10-8M
  • d) 8.1 × 10-7M
Q.20
pKa value of two acids A and B are 4 andThe strengths of these two acids are related as ..( Karnataka CET 2001]
  • a) Acid A is 10 times stronger than acid B
  • b) Strength of acid A : strength of acid B=4 :5
  • c)The strength of two acids cannot be compared
  • d)Acid B is 10 times stronger than acid A
Q.21
The pH of 0.1M solution of following increases in the order [ IIT 1999]
  • a) NaCl < NH4Cl < NaCN
  • b) HCl < NH4Cl < NaCl
  • c) NaCN < NH4Cl < NaCl < HCl
  • d) HCl < NaCl < NaCn < NH4Cl
Q.22
For reaction H2(g) + I2(g) ↔ 2HI(g) the equilibrium constant Kp changes with [ IIT 1981]
  • a)Total pressure
  • b) Catalyst
  • c)The amount of H2 and I2 present
  • d)Temperature
Q.23
in the equilibrium reaction involving the dissociation of CaCO3(s) ↔ CaO(s) + CO2(s)the equilibrium constant is given by ...[Pb. CET 1991]
  • a)
    ch-8_qn-82choice_img_no1.png
  • b)
    ch-8_qn-82choice_img_no2.png
  • c)
    ch-8_qn-82choice_img_no3.png
  • d)
    ch-8_qn-82choice_img_no4.png
Q.24
The yield of the product in the reactionA2(g) + 2B(g) ↔ C(g) + Q kJ would be higher at [ MLNR 1988]
  • a) High temperature and high pressure
  • b) High temperature and low pressure
  • c)Low temperature and high pressure
  • d)Low temperature and low pressure
Q.25
The equilibrium constant for the reaction H2(g) + I2(g) ↔ 2HI9g) at a certain temperature isthen the equilibrium constant for the reaction HI9g) ↔ ½ H2(g) + ½I2(g) at the same temperature is ..[Pb. CET1990]
  • a) 7
  • b) 1/7
  • c) 24.5
  • d) 98
Q.26
A liquid is in equilibrium with its vapour at its boiling point. On the average, the molecules in the two phases have equal .. [ IIT 1984]
  • a)Intermolecular force
  • b) Potential energy
  • c)kinetic energy
  • d)both kinetic and potential energy
Q.27
Select the reaction for which the equilibrium constant is written as [MX3]2=K [ MX2]2[X2]
  • a) MX3 ↔ MX2 + ½ X2
  • b) 2MX3 → 2MX2 + X2
  • c)2MX2 + X2 ↔ 2MX3
  • d)MX2 + ½X2 ↔ MX3
Q.28
The equilibrium constant for the reaction H2(g) + I2(g) ↔ 2HI(g) is 32 at given temperature. the equilibrium concentrations of I2 and HI are 0.5×10-3 and 8×10-3 M respectively. the equilibrium concentration of H2 is ..[Pb CET sample paper 1988]
  • a) 1 ×10-3 M
  • b) 0.5 ×10-3 M
  • c)2 ×10-3
  • d)4 ×10-3
Q.29
For which of the following systems at equilibrium at constant temperature, doubling the volume will cause a shift to the right? [ KCET 1992]
  • a) H2(g) + Cl2(g) ↔ 2HCl(g)
  • b) 2CO(g) + O2(g) ↔ 2CO2(g)
  • c) N2(g) + 3H2(g) ↔ 2NH3(g)
  • d) PCl5(g) ↔ PCl3 + Cl2(g)
Q.30
Which of the following will not change the concentration of ammonia in the equilibrium N2(g) + 3H2(g0 ↔ 2NH3(g); ΔH=-x kJ [ Pb. CET 1985]
  • a)Increase of pressure
  • b) Increase of temperature
  • c) Decrease of volume
  • d)Addition of catalyst
0 h : 0 m : 1 s