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The black precipitate of nickel sulphide dissolves in aqua regia and the reaction takes place as follows:
$3 N i S + 2 H N O_{3} + 6 H C l \overset{}{\to} 3 N i C l_{2} + 2 N O + 3 S + 4 H_{2} O$
After treatment with aqua regia nickel-chloride is obtained which is soluble in water. when dimethyl glyoxime is added to the aqueous solution of nickel chloride, made alkaline, by adding $N H_{4} O H$ solution, a brilliant red precipitate is obtained. Find sum of the number of $N i - N$ linkages and $N i - C$ linkages in brilliant red precipitate.

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answer is 4.

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Detailed Solution

${[N i {(d m g)}_{2}]}^{0}$

Have four $N i - N$ linkage

Have zero $N i - C$ linkage

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