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