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Oxides of Nitrogen

Which of the ...

Question

Which of the following compound is used in detection of metal ions such as $C u^{+ 2}, A g^{+}$ ?

A

P H_{3}

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B

N H_{3}

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C

N_{2}

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D

F e C l_{3}

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Solution

The correct option is A $N H_{3}$
Due to the presence of lone pair of electrons of nitrogen atom ammonia acts as Lewis base. It donates the electron pair and forms linkage with metal ions.
$C u^{+ 2} + 4 N H_{3} \to [C u (N H_{3})_{4}]^{2 -}$
$A g^{+} + C l^{-} \to A g C l$
$A g C l + 2 N H_{3} \to [A g (N H_{3})_{2}] C l$

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