Which of the following is not correct ?

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Dissolution of ${NH}_{4} Cl$ in excess of water is an endothermic process

Neutralisation process is always exothermic

The absolute value of enthalpy (H) can be determined experimentally

The heat of reaction at constant volume is denoted by $Δ E$

answer is C.

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Detailed Solution

Enthalpy (H) is relative with respect to hydrogen. Its absolute value cannot be determined experimentally. Enthalpy is the amount of internal energy contained in a compound whereas entropy is the amount of intrinsic disorder within the compound. Enthalpy is zero for elemental compounds such hydrogen gas and oxygen gas; therefore, enthalpy is nonzero for water (regardless of phase).

Hence the correct answer is (C) The absolute value of enthalpy (H) can be determined experimentally.

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