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12th Grade > Chemistry

IONIC EQUILIBRIUM MCQs

Total Questions : 30 | Page 1 of 3 pages
Question 1. Review the equilibrium and choose the correct statement 
HClO4 + H2O ⇌ H3O+ + ClO−4            
  1.    HClO4 is the conjugate acid of H2O
  2.    H3O+ is the conjugate base of H2O
  3.    H2O is the conjugate acid of H3O+
  4.    ClO−4 is the conjugate base of HClO4
 Discuss Question
Answer: Option D. -> ClO−4 is the conjugate base of HClO4
:
D
HClO4+H2O⇌H3O++ClO−4
Here HClO4and ClO−4constitute conjugate acid and base pair.
Question 2. Electrolytes when dissolved in water dissociate into their constituent ions. 
The degree of dissociation of an electrolyte increases with
  1.    Increasing concentration of the electrolyte 
  2.    Decreasing concentration of the electrolyte 
  3.    Decreasing temperature 
  4.    Presence of a substance yielding a common ion
 Discuss Question
Answer: Option B. -> Decreasing concentration of the electrolyte 
:
B
The degree of dissociation is inversely proportional to the concentration of the electrolyte.
Question 3. Ammonium hydroxide is a weak base because 
  1.    It has low vapour pressure 
  2.    It is only slightly ionized  
  3.    It is not a hydroxide of any metal
  4.    It has low density
 Discuss Question
Answer: Option B. -> It is only slightly ionized  
:
B
It is a weak electrolyte since slightly ionized.
Question 4. An ionizing solvent has 
  1.    Low value of dielectric constant
  2.    High value of dielectric constant
  3.    A dielectric constant equal to 1
  4.    Has a high melting point
 Discuss Question
Answer: Option B. -> High value of dielectric constant
:
B
Higher the dielectric constant of a solvent, more isits ionising power.
Question 5. The correct statements regarding the acids are 
A) NH3 can act as both bronsted base as well as Lewis base 
B) Dry hydrogen chloride is not Arrhenius acid 
 
C) According to Davy, acid must contain oxygen as necessary element
  1.    A and B
  2.    A and C
  3.    B and C
  4.    A, B and C
 Discuss Question
Answer: Option A. -> A and B
:
A
As NH3has lone pair of electron, it can donate lone pair and can accept a proton,Arrhenius theory is limited to aqueous solutions only
Question 6. The extent of ionization increases                      
  1.    With the increase in concentration of solute
  2.    On addition of excess water to solution
  3.    On decreasing the temperature of solution
  4.    On stirring the solution vigorously
  5.    None of the options are correct.
 Discuss Question
Answer: Option B. -> On addition of excess water to solution
:
B
withdilution of the solution.
Question 7. The dissociation constant of two acids HA1 and  HA2  are  3.14 × 10−4 and 1.96 × 10−5 respectively. The relative strength of the acids will be approximately 
  1.    1:4
  2.    4:1
  3.    1:16
  4.    16:1
 Discuss Question
Answer: Option B. -> 4:1
:
B
α1α2=√Ka1Ka2=√3.14×10−41.6×10−5 = 4:1
Question 8. An electrolyte                    
  1.    Gives complex ions in solution 
  2.    Dissolves in water to give ions 
  3.    Is ionized in the solid state 
  4.    Generates ions on passing electric current
  5.    None of the options are correct.
 Discuss Question
Answer: Option B. -> Dissolves in water to give ions 
:
B
Electrolytes are those substances which on dissolving in water give ions.
Question 9. Total number of moles for the reaction 2HI ⇋ H2 + I2 if α is degree of 
dissociation is    
  1.    2
  2.    1
  3.    2 - α
  4.    1 - α
 Discuss Question
Answer: Option A. -> 2
:
A
Initially 2HI⇋H2+I2
Moles of HI=2,H2=0,I2=0
At equilibrium,
Moles of HI=2−α,H2=α2,I2=α2
Total moles = 2−α+α2+α2=2
Question 10. Which of the following is the strongest conjugate base
 
  1.    Cl−
  2.    CH3COO−
  3.    SO2−4
  4.    NO−2
 Discuss Question
Answer: Option B. -> CH3COO−
:
B
Because it is conjugate base of weak acid.
CH3COOH⇌CH3COO−+H+

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