Among the following compounds the one which liberates the maximum amount of heat when dissolved in the same amount of water. (Heat of solution at 25 $^{0}$ C is given in brackets)

K C l (Δ H = + 1.02 K . c a l)

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H N O_{3} (Δ H = - 7.83 K . c a l)

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H C l (Δ H = - 17.74 K . c a l)

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N H_{4} C l (Δ H = + 5.05 K . c a l)

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Solution

The correct option is C $H C l (Δ H = - 17.74 K . c a l)$
Maximum amount of heat is released in case of HCl as its $Δ H$ is least

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