Question

Lithium nitrate and sodium nitrate, when heated separately, respectively, give :

• A. $LiNO _2$ and $NaNO _2$
• B. $Li _2 O$ and $Na _2 O$
• C. $Li _2 O$ and $NaNO _2$
• D. $LiNO _2$ and $Na _2 O$

Answer 1

Answer: (C)

$Li _2 O , NaNO _2$
As per NCERT Lithium nitrate when heated gives lithium oxide, $Li _2 O$, whereas other alkali metal nitrates decompose to give the corresponding nitrite.
$4 LiNO _3 \longrightarrow 2 Li _2 O +4 NO _2+ O _2$
$2 NaNO _3 \longrightarrow 2 NaNO _2+ O _2$
However, the decomposition product of $NaNO _3$ are temperature dependent process as shown in the below reaction.