CBSE Class 11 Chemistry Chemical Equilibrium MCQs Set 03

Question: Which of the following is not a Lewis acid?
a) SiF₄
b) C₂H₄
c) BF3
d) FeCl₃
Answer: b

Question: A 20 litre container at 400 K contains CO_2(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving he movable piston fitted in the container. The maximum volume of the container, when pressure of CO₂ attains its maximum value, will be (Given that : SrCO_3(s) ⇌ SrO(s) + O_2(g), K_p = 1.6 atm)
a) 10 litre
b) 4 litre
c) 2 litre
d) 5 litre
Answer: d

Question: For the reversible reaction, N_2(g) + 3H_2(g) ⇌ 2NH_3(g) + heat The equilibrium shifts in forward direction
a) by increasing the concentration of NH3(g)
b) by decreasing the pressure
c) by decreasing the concentrations of N2(g) and H2(g)
d) by increasing pressure and decreasing emperature.
Answer: d

Question: Repeated use of which one of the following fertilizers would increase the acidity of the soil?
a) Ammonium sulphate
b) Superphosphate of lime
c) Urea
d) Potassium nitrate
Answer: a

Question: The values of Kp₁ and Kp₂ for the reactions, X ⇌ Y + Z ...(i) A ⇌ 2B ...(ii) are in the ratio 9 : 1. If degree of dissociation of X and A be equal, then total pressure at equilibrium (i) and ii) are in the ratio
a) 36 : 1
b) 1 : 1
c) 3 : 1
d) 1 : 9
Answer: a

Question: Which is the strongest acid in the following?
a) HClO₄
b) H2SO₃
c) H2SO₄
d) HClO₃
Answer: a

Question: If the concentration of OH– ions in the reaction Fe(OH)₃(s) ⇌ Fe³⁺_(aq) + 3OH– _(aq) is decreased by 1/4 times, then equilibrium concentration of Fe³⁺ will increase by
a) 64 times
b) 4 times
c) 8 times
d) 16 times.
Answer: d

Question: Aqueous solution of acetic acid contains
a) CH₃COO^– and H⁺
b) CH₃COO^–, H₃O⁺ and CH₃COOH
c) CH₃COO^–, H₃O⁺ and H⁺
d) CH₃COOH, CH₃COO^– and H⁺
Answer: b

Question: The percentage of pyridine (C₅H₅N) that forms pyridinium ion (C₅H₅N + H) in a 0.10 M aqueous pyridine solution (Kb for C₅H₅N = 1.7 × 10^–9) is
a) 0.0060%
b) 0.013%
c) 0.77%
d) 1.6% 
Answer: b

Question: Which of the following statements is correct for a reversible process in a state of equilibrium?
a) ΔG° = –2.30 RT log K
b) ΔG° = 2.30 RT log K
c) ΔG = –2.30 RT log K
d) ΔG = 2.30 RT log K
Answer: a

Question: The hydrogen ion concentration of a 10^–8 M HCl aqueous solution at 298 K (Kw = 10–14) is
a) 1.0 × 10^–8 M
b) 1.0 × 10^–6 M
c) 1.0525 × 10^–7 M
d) 9.525 × 10^–8 M 
Answer: c

Question: The strongest conjugate base is
a) SO₄^2–
b) Cl–
c) NO₃^–
d) CH₃COO^– 
Answer: d

Question: KMnO4 can be prepared from K₂MnO₄ as per the reaction,3MnO₄ 2– + 2H₂O ⇌ 2MnO4 – + MnO₂ + 4OH– The reaction can go to completion by removing OH– ions by dding
a) CO₂
b) SO₂
c) HCl
d) KOH
Answer: a

Question: At 100°C the Kw of water is 55 times its value at 25°C. What will be the pH of neutral solution? (log 55 = 1.74)
a) 7.00
b) 7.87
c) 5.13
d) 6.13
Answer: d

Question: The approximately pH of0.005 molar sulphw·ic acid is
a) 0.005
b) 2 
c) 1
d) 0.01
 Answer: b

Question: The ionization constant of ammonium hydroxide is 1.77 × 10^–5 at 298 K. Hydrolysis constant of ammonium chloride is
a) 6.50 × 10^–12
b) 5.65 × 10^–13
c) 5.65 × 10^–12
d) 5.65 × 10^–10 
Answer: d

Question: What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed?
a) 2.0
b) 7.0
c) 1.04
d) 12.65 
Answer: d

Question: Which of the following solutions will have pH = 9 at 298 K? 
a) 1 X 10^-9 M HCl solution
b) 1 x 10^-5 M NaOH solution
c) 1 X 10^-9 M KOH solution
d) Both 1 X 10^-9 M HCl solution and 1 x 10^-5 M NaOH solution
Answer: b

Question: Conjugate base for Bronsted acids H₂O and HF are
a) H₃O⁺ and H₂F⁺, respectively
b) OH^– and H₂F^+, respectively
c) H₃O⁺ and F^–, respectively
d) OH^– and F^–, respectively.
Answer: d

Question: Find out the solubility of Ni(OH)₂ in 0.1 M NaOH. Given that the ionic product of Ni(OH)₂ is 2 × 10^–15.
a) 2 × 10^–13 M
b) 2 × 10^–8 M
c) 1 × 10^–13 M
d) 1 × 10⁸ M
Answer: a

Question: pH of a 0.0001 M HCI solution is 
a) 4.0
b) 2 .0
c) 6 .0
d) 7.0
Answer: a

Question: If the value of equilibrium constant for a particular reaction is 1.6 × 1012, then at equilibrium the system will contain
a) mostly products
b) similar amounts of reactants and products
c) all reactants
d) mostly reactants. 
Answer: a

Question: The pH ofa solution obtained by mixing 50 mL of 1 N HCl and 30 mL of 1 N NaOH is (log 2.5 = 0.3979)
a) 3.979
b) 0.6021
c) 12.042
d) 1.2042
Answer: b

Question: Which one of the following compounds is not a protonic acid?
a) B(OH)₃
b) PO(OH)₃
c) SO(OH)₂
d) SO₂(OH)₂ 
Answer: a

Question: 100 mL of 0.015 M HCI solution is mixed with 100 mL of 0.005 M HCI. What is the pH of the resultant solution?
a) 2.5
b) 1.5 
c) 2
d) 1
Answer: c

Question: In HS–, I–, R – NH₂, NH₃ order of proton accepting tendency will be
a) I^– > NH₃ > R – NH2 > HS^–
b) NH_{3 >} R ^– NH₂ > HS^– > I^–
c) R ^– NH₂ > NH₃ > HS^– > I^–
d) HS^– > R ^– NH₂ > NH₃ > I^–
Answer: c

Question: A 0.01 M ammonia solution is 5% ionised, its pH will be
a) 11.80
b) 10.69 
c) 7.22
d) 12 .24
Answer: b

Question: Which compound is electron deficient?
a) BeCl₂
b) BCl₃
c) CCl₄
d) PCl₅ 
Answer: b

Question: Aqueous solution of which of the following compounds is the best conductor of electric current?
a) Hydrochloric acid, HCl
b) Ammonia, NH₃
c) Fructose, C₆H1₂O₆
d) Acetic acid, C₂H₄O₂
Answer: a

Question: In which of the following equilibrium Kc and Kp are not equal?
a) 2NO^(g) ⇌ N_2(g) + O_2(g)
b) SO_2(g) + NO_2(g) ⇌ SO_3(g) + NO_(g)
c) H2_(g) + I_2(g) ⇌ 2HI_(g)
d) 2C_(s) + O2(g) ⇌ 2CO_2(g) 
Answer: d