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Stoichiometric Calculations

NH3aq reacts ...

Question

$N H_{3} (a q)$ reacts very easily with $C u^{2 +}$ ; if acid is added into aqueous solution of $N H_{3}$ , there is no reaction.
If true enter 1, else enter 0.
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Solution

The correct option is A 1
$N H_{3}$ form deep blue coloured complex with $C u^{2 +}$ and colour change appears rapidly. Acid neutralises $N H_{4} O H (a q N H_{3})$ but reaction appears bit slowly.

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