Consider the following reactions $\mathrm{NiS}+\mathrm{HNO}_{3}+\mathrm{HCl} \rightarrow \mathrm{A}+\mathrm{NO}+\mathrm{S}+\mathrm{H}_{2} \mathrm{O}$ The number of protons that do not involve in hydrogen bonding in the product B is ______.

JEE Main · 2024 · 06 Apr 2024 · Shift 2 · Aldehydes Ketones and Carboxylic Acids

Consider the following reactions

NiS + HNO_{3} + HCl \to A + NO + S + H_{2} O

The number of protons that do not involve in hydrogen bonding in the product B is ______.

Answer: 12

Solution

3 NiS + 2 HNO_{3} + 6 HCl \to 3 NiCl_{2} + 2 NO + 3 S + 4 H_{2} O

generates

Ni^{2 +}

(as A,

NiCl_{2}

). With dimethylglyoxime in ammoniacal medium,

Ni^{2 +}

forms the red, square-planar bis(dimethylglyoximato)nickel(II) complex (B), in which the two O–H groups are tied up in intramolecular O–H···O hydrogen bonds bridging the two ligand units, while the four methyl groups' hydrogens (

4 \times 3 = 12

protons) take no part in hydrogen bonding.

JEE Main · 2024 · 06 Apr 2024 · Shift 2 · Integer answer

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