Which of the following statement(s) is/are true/false?

A. The following reaction is an example of a reversible reaction:

N2(g) + 3H2(g) ⇌ 2NH3(g)

B. The following reaction is an example of a thermal decomposition reaction:

CaCO3(s) (rm underrightarrow {heat}) CaO(s) + CO2(g)

  1. Both A and B are false.
  2. Only B is true.
  3. Both A and B are true.
  4. Only A is true.
Both A and B are true.

Correct Answer: Option 3: Both A and B are true.

Key Points

  • A reversible reaction is one that can proceed in both forward and backward directions.
  • The reaction N2(g) + 3H2(g) ⇌ 2NH3(g) is indeed reversible, as the formation of ammonia can be reversed to produce nitrogen and hydrogen.
  • A thermal decomposition reaction involves breaking down a compound into simpler substances by heating.
  • The reaction CaCO3(s) → CaO(s) + CO2(g) exemplifies thermal decomposition, where calcium carbonate decomposes into calcium oxide and carbon dioxide when heated.

Why Other Options Are Wrong

  • Option 1: Both A and B are false – This is incorrect as both statements A and B are true.
  • Option 2: Only B is true – This is incorrect as statement A is also true.
  • Option 4: Only A is true – This is incorrect as statement B is also true.

Quick Tip for Exam

When encountering questions about reaction types, remember to identify the characteristics of each reaction. Reversible reactions can shift between products and reactants, while thermal decomposition requires heat to break down compounds. Familiarize yourself with common examples to strengthen your understanding.

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