State how $N H_{4} O H$ is used for identifying $C u^{2 +}$ cations, the balanced equation is represented as:

{C u S O}_{4} + {4 N H}_{4} O H \to {({N H}_{4})}_{2} {S O}_{4} + C u {(O H)}_{2} + 2 {N H}_{4} O H

\to [C u {({N H}_{3})}_{4}] {S O}_{4} + {4 H}_{2} O

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{C u S O}_{4} + {N H}_{4} O H \to {({N H}_{4})}_{2} {S O}_{4} + C u {(O H)}_{2} + 2 {N H}_{4} O H

\to [C u {({N H}_{3})}_{4}] {S O}_{4} + {4 H}_{2} O

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{2 C u S O}_{4} + {2 N H}_{4} O H \to {({N H}_{4})}_{2} {S O}_{4} + C u {(O H)}_{2} + 2 {N H}_{4} O H

\to [2 C u {({N H}_{3})}_{4}] {S O}_{4} + {4 H}_{2} O

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{C u S O}_{4} + {2 N H}_{4} O H \to {({N H}_{4})}_{2} {S O}_{4} + C u {(O H)}_{2} + 2 {N H}_{4} O H

\to [C u {({N H}_{3})}_{4}] {S O}_{4} + {4 H}_{2} O

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Solution

The correct option is A ${C u S O}_{4} + {4 N H}_{4} O H \to {({N H}_{4})}_{2} {S O}_{4} + C u {(O H)}_{2} + 2 {N H}_{4} O H$ $\to [C u {({N H}_{3})}_{4}] {S O}_{4} + {4 H}_{2} O$

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