Chemical Equilibrium Test

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Chemical Equilibrium Test - 40

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Weekly Quiz Competition

Question 1
4 / -1

A buffer solution has equal volumes of 0.2 M NH₄ OH and 0.02 M NH₄Cl. The pK_b of the base is 5. The pH is equal to

A
10

B
9

C
4

D
7
Question 2
4 / -1

Assertion (A) The pH of a buffer solution containing equal moles of acetic acid and sodium acetate is 4.8 (pK_a of acetic acid is 4.8).
Reason (R) The ionic product of water at 25°C is 10^-4 mo1² L^-2. The correct answer is

A
Both A and R are true and R is the correct explanation of A.

B
Both A and R are true and R is not the correct explanation of As.

C
A is true but R is not true.

D
A is not true but R is true.
Question 3
4 / -1

The compound whose 0.1 M solutions is basic, is

A
ammonium acetate

B
ammonium chloride

C
ammonium sulphate

D
sodium acetate
Question 4
4 / -1

Which of the following reactions will be favoured at low pressure?

A

B

C

D
Question 5
4 / -1

For the manufacture of ammonia by Haber’s process, i.e.

A
High temperature, high pressure

B
Low temperature, low pressure

C
High temperature, low pressure

D
Low temperature, high pressure
Question 6
4 / -1

The equilibrium constant in a reversible chemical reaction at a given temperature

A
depends on the initial concentration of the reactants

B
depends on the concentration of one of the products at equilibrium

C
does not depend on the initial concentrations of reactants

D
is not characteristic of the reaction
Question 7
4 / -1

Which of the following substances on dissolving in water will give a basic solution?

A
Na₂CO₃

B
Al₂(SO₄)₃

C
NH₄Cl

D
KNO₃
Question 8
4 / -1

A mixture of a weak acid (say acetic acid) and its salt with a strong base (say sodium acetate) is a buffer solution. Which other pair of substances from the following may have a similar property?

A
HCl and NaCl

B
NaOH and NaNO₃

C
KOH and KCl

D
NH₄OH and NH₄Cl
Question 9
4 / -1

Silver nitrate solution is gradually added to an aqueous solution containing 0.01 M each of chloride, bromide and iodide ions. The correct sequence in which the halides will be precipitated is

A
Br^–, Cl^–, I^–

B
I^–, Cl^–, Br^–

C
I^–, Br^–, Cl^–

D
Br^–, I^–, Cl^–

Solution
Question 10
4 / -1

Which one of the following is NOT a buffer solution?

A
0.8 MH2S + 0.8 M KHS

B

C
3 M H₂CO₃ + 3 M KHCO₃

D
0.05 MKClO₄ + 0.05 MHClO₄