sblock Elements - Result Question 31
####41. Sodium nitrate decomposes above $\approx 800^{\circ} C$ to give
(a) $N _2$
(b) $O _2$
(c) $NO _2$
(d) $Na _2 O$
$(1998,2 M)$
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Answer:
Correct Answer: 41. $(a, b, d)$
Solution:
- $NaNO _3$ when heated, it decomposes in two stages as:
$$ \begin{aligned} & NaNO _3 \xrightarrow{T<500^{\circ} C} NaNO _2+\frac{1}{2} O _2 \\ & NaNO _2 \xrightarrow{T>800^{\circ} C} Na _2 O+N _2+O _2 \end{aligned} $$
