A \( \mathrm{NH}_{4} \mathrm{OH} \)
B \( \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{2} \)
C NaOH
D \( \mathrm{NH}_{4} \mathrm{SCN} \)
E \( \mathrm{NH}_{4} \mathrm{Cl} \)
Correct Answer: Option A
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