Q.1
Four species are listed below (i) HCO3-   (ii) H+ (iii) HSO4-   (iv) HSO3F Which one of the following is the correct sequence of their acid strength [ AIEEE 2008]
  • a) iii < i < iv < ii
  • b) iv < ii < iii < i
  • c)ii < iii < i < iv
  • d)i < iii < ii < iv
Q.2
Among the following acids, which has the lowest pKa value?
  • a) CH3COOH
  • b) HCOOH
  • c)(CH3)2CHOOH
  • d)CH3CH2COOH
Q.3
Which of the following bases is the weakest?
  • a) C9H7N :  Kb=6.3 ×10⁻¹⁰
  • b) C2H5NH2 :  Kb=5.6 ×10⁻⁴
  • c) C6H5NH2 :  Kb=3.8 ×10⁻¹⁰
  • d)NH4OH :   Kb=1.6 ×10⁻⁶
Q.4
A solution which is 10-3 M each in Mn2+, Fe2+, Zn2+ and Hg2+ is treated with 10-16M sulphide ion. If Ksp of MnS, FeS, ZnS and HGS are 10-15,10-23, 10-20 and 10-54 respectively, which one will precipitate first.. [ IIT 2003]
  • a) FeS
  • b) MnS
  • c) HgS
  • d) ZnS
Q.5
On adding 0.1M solution each of [Ag+], [Ba2+], [Ca2+] in a Na2SO4 solution, species first precipitated is [Ksp of BaSO4=10-11, Ksp of CaSO4=10-6, Ksp of Ag2SO4=10-5]
  • a)Ag2SO4
  • b) BaSO4
  • c)CaSO4
  • d)All of these
Q.6
Precipitation takes place when the ionic product [ Roorkee 1983]
  • a) Equals the solubility product
  • b) Exceeds the solubility product
  • c)Is less than the solubility product
  • d)Is almost zero
Q.7
At 25°C, the dissociation constant of Ch3COOH and NH4OH in aqueous solution are almost same ( 10-5). If pH of some acetic acid solution is 3.0 The pH of solution of NH4OH of same concentration at the same temperature would be [ Roorkee 1990]
  • a) 3.0
  • b) 4.0
  • c)10.0
  • d)11.0
Q.8
Species acting both as Bronsted acid and base is
  • a)HSO4-
  • b) Na2CO3
  • c)NH3
  • d)OH-
Q.9
The pH of 0.1M aqueous solution of weak acid ( HA) isIts degree of dissociation is
  • a) 1%
  • b) 10%
  • c)50%
  • d)25%
Q.10
An acid buffer solution can be prepared by mixing equimolar amount of ..[ IIT 1981]
  • a) Formic acid and sodium formate
  • b) NH4Cl and NH4OH
  • c)H2SO4 and NA2SO4
  • d)CH3CONH2 and KOH
Q.11
pKa of acetic acid is 4.The concentration of CH3COONa is 0.01 M. The pH of CH3COONa ia [ Orissa JEE 2004]
  • a) 8.37
  • b) 4.37
  • c) 4.74
  • d) 0.474
Q.12
Which of the following salts undergoes anionic hydrolysis?
  • a) CuSO4
  • b) Na2CO3
  • c)NH4Cl
  • d)FeCl3
Q.13
An acidic buffer solution can be prepared by mixing solution of .. [ IIT 1981]
  • a)Sodium acetate and acetic acid
  • b) Ammonium chloride and ammonium hydroxide
  • c)Sulphuric acid and sodium sulphate
  • d)Sodium chloride and sodium hydroxide
Q.14
aht is the decreasing order of strength of the bases:
ch-8_que_no-59_img_no1.png
  • a)
    ch-8_qn-59choice_img_no1.png
  • b)
    ch-8_qn-59choice_img_no2.png
  • c)
    ch-8_qn-59choice_img_no3.png
  • d)
    ch-8_qn-59choice_img_no4.png
Q.15
Which of the following is Bronsted acid as well as a Bronsted base?
  • a) BF3
  • b) NH3
  • c) H2O
  • d) Na2CO3
Q.16
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.17
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.18
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.19
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.20
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.21
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.22
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.23
Compound whose 0.1M solution is basic is .. [ IIT 1986]
  • a) Ammonium acetate
  • b) Ammonium chloride
  • c)Ammonium sulphate
  • d)Sodium Acetate
Q.24
The pH of a solution obtained by mixing 50ml of 0.4M HCl with 50ml of 0.2 M NaOH is
  • a) - log2
  • c) 1.0
  • d) 2.0
  • b) - log2×10⁻¹
Q.25
The solubility of A2 X3 is y mol dm-Is solubility product is ..[ IIT 1997]
  • a)6y4
  • b) 64y4
  • c)36y5
  • d)108y5
Q.26
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.27
Which of the following can not act a a Lewis acid or Bronsted acid?
  • a)CCl4
  • b) SnCl4
  • c)AlCl3
  • d)BF3
Q.28
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.29
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.30
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
0 h : 0 m : 1 s