Chapter Exam

Chapter-8 Reversible Reactions and Equilibrium — Online MCQ Test

Q: Which symbol is used to represent a reversible reaction?

Answer: B. ⇌ — The double-headed arrow (⇌) represents a reversible reaction where both forward and backward reactions occur simultaneously.

Q: Which factor does NOT directly affect the position of equilibrium?

Answer: D. The presence of a catalyst — A catalyst speeds up both forward and backward reactions equally, so it does not shift the equilibrium position, only helps reach it faster.

Q: Consider the equilibrium: N₂O₄(g) ⇌ 2NO₂(g), ΔH = +58 kJ/mol. Which change will increase the proportion of NO₂ at equilibrium?

Answer: C. Increasing temperature — Since the forward reaction is endothermic (+ΔH), increasing temperature shifts equilibrium right, favoring NO₂ formation and increasing its proportion.

CHEMISTRY · Grade 10 · IGCSE cambridge

Practice Chapter-8 Reversible Reactions and Equilibrium with a free chapter-wise online MCQ test for IGCSE cambridge Grade 10 CHEMISTRY. This chapter covers: Reversible reactions dynamic equilibrium and the conditions used in industrial processes.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-8 Reversible Reactions and Equilibrium — Important Questions & Answers (FAQ)

Frequently asked questions from IGCSE cambridge Grade 10 CHEMISTRY — Chapter-8 Reversible Reactions and Equilibrium, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is a reversible reaction?

A. A reaction that can only proceed in one direction
B. A reaction where reactants can form products and products can reform reactants ✓
C. A reaction that requires a catalyst to proceed
D. A reaction that releases energy continuously

Answer: B. A reaction where reactants can form products and products can reform reactants
A reversible reaction is one where products can decompose back into reactants, represented by the double arrow (⇌) symbol.

Which symbol is used to represent a reversible reaction?

A. →
B. ⇌ ✓
C. ←
D. ⇄

Answer: B. ⇌
The double-headed arrow (⇌) represents a reversible reaction where both forward and backward reactions occur simultaneously.

Which factor does NOT directly affect the position of equilibrium?

A. Temperature
B. Pressure
C. Concentration of reactants
D. The presence of a catalyst ✓

Answer: D. The presence of a catalyst
A catalyst speeds up both forward and backward reactions equally, so it does not shift the equilibrium position, only helps reach it faster.

Consider the equilibrium: N₂O₄(g) ⇌ 2NO₂(g), ΔH = +58 kJ/mol. Which change will increase the proportion of NO₂ at equilibrium?

A. Decreasing temperature
B. Increasing pressure
C. Increasing temperature ✓
D. Using a catalyst

Answer: C. Increasing temperature
Since the forward reaction is endothermic (+ΔH), increasing temperature shifts equilibrium right, favoring NO₂ formation and increasing its proportion.

Why is a lower temperature NOT preferred in the industrial synthesis of ammonia via the Haber Process, despite the forward reaction being exothermic?

A. Lower temperature increases the equilibrium constant more than high temperature
B. Lower temperature makes the reaction rate extremely slow, reducing practical yield per unit time ✓
C. Lower temperature shifts equilibrium backward
D. The catalyst only works at high temperatures

Answer: B. Lower temperature makes the reaction rate extremely slow, reducing practical yield per unit time
While lower temperature favors product formation (exothermic), it drastically slows the reaction rate. Industry uses ~450°C as a compromise between yield and practical production speed.

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