Dinitrogen gas is evolved when sodium nitrite is heated below \( 500^{\circ} \mathrm{C} \) : \( ...

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Dinitrogen gas is evolved when sodium nitrite is heated below \( 500^{\circ} \mathrm{C} \) :
\( \mathrm{P} \)
(A) alone
(B) with ammonium chloride
(C) with sodium chloride
(D) with potassium nitrate
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