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In which of the following combinations of $HCl$ and $NaOH$ , the heat energy liberated is maximum

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$25 ml$ of $0.1 M HCl + 25 ml$ of $0.1 M NaOH$

$10 ml$ of $0.1 M HCl + 40 ml$ of $0.1 M NaOH$

$35 ml$ of $0.1 M HCl + 15 ml$ of $0.1 M NaOH$

$30 ml$ of $0.1 M HCl + 20 ml$ of $0.1 M NaOH$

answer is C.

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Detailed Solution

Heat liberated ∝moles of salt formed ……….(i)

The reaction for the given reactant is, $HCl + NaOH \to NaCl + H_{2} O$

In combination, A 1 millimole of product is formed from a given amount of reactant.

In combination B 2 millimole of product is formed from a given amount of reactant.

In combination C 2.5 millimole of product is formed from a given amount of reactant.

In combination D 1.5 millimole of product is formed from a given amount of reactant.

Hence based on (i) maximum heat is liberated in case C.

Hence option C is the correct answer.

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