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

Chemical Equilibrium| First Year Chemistry Past Paper MCQs

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1 The unit of equilibrium constant Kc for the reaction H₂ + I₂ ⇌ 2HI is:
Correct Answer: D
Explanation: Kc for this reaction is dimensionless (same number of moles on both sides).
2 Which of the following reactions will be favored to the forward direction at low pressure?
Correct Answer: C
Explanation: Low pressure favors the side with more gas molecules (PCl₅ → 2 molecules).
3 pH of a buffer can be calculated by using:
Correct Answer: B
Explanation: Henderson-Hasselbalch equation: pH = pKa + log([A⁻]/[HA]).
4 In synthesis of ammonia by Haber's process, the optimum condition for pressure is:
Correct Answer: B
Explanation: Haber process typically uses 170-200 atm for optimal NH₃ yield.
5 A solution has pOH = 12. It is:
Correct Answer: A
Explanation: pOH = 12 ⇒ pH = 2 (strongly acidic). Note: Answer key shows 'a' but explanation suggests acidic.
6 In the reaction N₂ + 3H₂ ⇌ 2NH₃, the catalyst used is:
Correct Answer: A
Explanation: Iron (Fe) with promoters (Al₂O₃, K₂O) is the industrial catalyst.
7 The value of equilibrium constant can predict:
Correct Answer: D
Explanation: K indicates both reaction direction (Q vs. K) and extent (large K → favors products).
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