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(C) The reaction of $EH_{3}$ with $K_{2}HgI_{4}$ (Nessler's reagent) in an alkaline medium to form a brown precipitate of basic mercury$(II)$amido-iod

Vedclass · Accepted Answer

$1402$

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(C) The reaction of $EH_{3}$ with $K_{2}HgI_{4}$ (Nessler's reagent) in an alkaline medium to form a brown precipitate of basic mercury$(II)$amido-iodine is a characteristic test for ammonia $(NH_{3})$.Therefore, the element $E$ is nitrogen $(N)$.The first ionization enthalpy values for the first elements of groups $13, 14, 15$, and $16$ are $B$ $(801 \ kJ \ mol^{-1})$, $C$ $(1086 \ kJ \ mol^{-1})$, $N$ $(1402 \ kJ \ mol^{-1})$, and $O$ $(1314 \ kJ \ mol^{-1})$.Since $E$ is $N$, its first ionization enthalpy is $1402 \ kJ \ mol^{-1}$.

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