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📚 STS JST PAST PAPER 2026
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Which of the following changes is endothermic?
📚 STS JST PAST PAPER 2026
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Which of the following changes is endothermic?
A
H2(g) + Cl2(g) → HCl(g)
B
H2O(l) → 2H2(g) + O2(g)
C
H2O(l) → H2O(g)
D
2H2(g) + O2(g) → 2H2O(l)
💡
Explanation:
Decomposition of water requires energy input (endothermic) to break bonds between hydrogen and oxygen.
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