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:

  1. $NaNO _3$ when heated, it decomposes in two stages as:

$$ \begin{aligned} & NaNO _3 \xrightarrow{T<500^{\circ} C} NaNO _2+\frac{1}{2} O _2 \\ & NaNO _2 \xrightarrow{T>800^{\circ} C} Na _2 O+N _2+O _2 \end{aligned} $$



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