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Chemistry Question on Thermodynamics

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

A

CaO+H2O→Ca(OH)2CaO+H_{2}O \to Ca \left(OH\right)_{2}

B

SrO+H2O→Sr(OH)2SrO+H_{2}O \to Sr \left(OH\right)_{2}

C

BaO+H2O→Ba(OH)2BaO+H_{2}O \to Ba \left(OH\right)_{2}

D

MgO+H2O→Mg(OH)2MgO +H_{2} O \to Mg \left(OH\right)_{2}

Answer

CaO+H2O→Ca(OH)2CaO+H_{2}O \to Ca \left(OH\right)_{2}

Explanation

Solution

The correct answer is (A) : CaO+H2O→Ca(OH)2CaO+H_{2}O \to Ca \left(OH\right)_{2}
Due to smaller size of calcium hydration energy will be maximum.