Which one of the following is an endothermic reaction ?
- A. \\( CH_4 (g) + 2O_2 (g) \\rightarrow CO_2 (g) + 2O_2 (g) \\)
- B. \\( C_6H_{12}O_6 (aq) + 6O_2 (g) \\rightarrow 6CO_2 (g) + 6H_2O (l) \\)
- C. \\( N_2 (g) + 3H_2 (g) \\rightarrow 2NH_3 (g) \\)
- D. \\( 2Pb(NO_3)_2 (s) \\rightarrow 2PbO (s) + 4NO_2 (g) + O_2 (g) \\) ✓
Correct Answer: D. \\( 2Pb(NO_3)_2 (s) \\rightarrow 2PbO (s) + 4NO_2 (g) + O_2 (g) \\)
Explanation
The decomposition of lead nitrate requires heating to take place, making it an endothermic reaction. The others are exothermic.
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