MCQ
Which of the following endothermic processes are spontaneous?
- AMelting of ice
- BEvaporation of water
- CHeat of combustion
- ✓Both $(a)$ and $(b)$
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Acidified $K _2 Cr _2 O _7$, alkaline $KMnO _4, CuSO _4, H _2 O _2, Cl _2, O _3, FeCl _3, HNO _3$ and $Na _2 S _2 O _3$. The total number of reagents that can oxidise aqueous iodide to iodine is