Chemical Equilibrium| First Year Chemistry Past Paper MCQs | mosaicbro.com

Chemical Equilibrium| First Year Chemistry Past Paper MCQs

7 of 30 questions (Page 3 of 5)

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15 The law of mass action was given by:
Correct Answer: C
Explanation: Guldberg and Waage formulated the law of mass action (1864).
16 Le Chatelier's principle is applicable to:
Correct Answer: B
Explanation: Le Chatelier's principle predicts equilibrium shifts in reversible systems.
17 The equilibrium constant for the reverse reaction is:
Correct Answer: B
Explanation: K_reverse = 1/K_forward.
18 In a chemical equilibrium, the rate of forward reaction is:
Correct Answer: C
Explanation: At equilibrium, forward and reverse rates are equal.
19 The equilibrium constant for N₂ + 3H₂ ⇌ 2NH₃ is K. The equilibrium constant for ½N₂ + ³⁄₂H₂ ⇌ NH₃ will be:
Correct Answer: C
Explanation: When reaction is halved, K_new = K^(1/2).
20 For the reaction 2SO₂ + O₂ ⇌ 2SO₃, if Kc = x, then for SO₃ ⇌ SO₂ + ½O₂, Kc will be:
Correct Answer: B
Explanation: Reversed and halved reaction ⇒ K' = 1/√K.
21 The pH of 0.01 M NaOH solution is:
Correct Answer: C
Explanation: pOH = -log(0.01) = 2 ⇒ pH = 14 - 2 = 12.
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