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

Chemical Equilibrium| First Year Chemistry Past Paper MCQs

7 of 30 questions (Page 2 of 5)

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8 The pH of 10⁻³ mol dm⁻³ of an aqueous solution of HCl is:
Correct Answer: A
Explanation: Strong acid: pH = -log[H⁺] = -log(10⁻³) = 3.
9 Formation of NH₃ is exothermic. Low temperature favors forward reaction. However, in Haber's process temperature used is:
Correct Answer: C
Explanation: Compromise between kinetics and equilibrium: 400-450°C is used industrially.
10 The unit of equilibrium constant (Kc) for the reaction: N₂ + 3H₂ ⇌ 2NH₃ will be:
Correct Answer: D
Explanation: Kc = [NH₃]²/([N₂][H₂]³) ⇒ units = (mol dm⁻³)²/(mol dm⁻³)(mol dm⁻³)³ = mol⁻² dm⁶.
11 When KCl is added to a saturated solution of KClO₃, the equilibrium is shifted to the:
Correct Answer: B
Explanation: Common ion effect (K⁺) reduces solubility, shifting equilibrium toward solid KClO₃.
12 In which of the following reactions Kc and Kp will be equal:
Correct Answer: D
Explanation: Kp = Kc when Δn = 0 (N₂ + O₂ ⇌ 2NO has same moles of gas on both sides).
13 When HCl is passed through saturated solution of NaCl, the solubility of NaCl is:
Correct Answer: B
Explanation: Common ion effect (Cl⁻) reduces NaCl solubility.
14 pH of rain water is:
Correct Answer: C
Explanation: Normal rainwater pH ≈ 5.6 (due to dissolved CO₂), but polluted rain can be lower.
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