JEE Main 2013 Chemistry question

In which of the following exothermic reactions, the heat liberated per mole is the highest ?

(1)Correct
(2)
(3)
(4)

Answer: (1)

Solution

The hydration enthalpy of the oxide (and hence the heat liberated) is largest for the smaller, more polarising cation among those that react readily; CaO slaking is the

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Question ID VK-104205