Q26 / 180 · KCET 2024 · Chemistry

Which one of the following nitrate will decompose to give $\mathrm{NO}_2$ on heating ?

  • A
    $\mathrm{NaNO}_3$
  • B
    $\mathrm{KNO}_3$
  • C
    $\mathrm{RbNO}_3$
  • Correct answer
    D
    $\mathrm{LiNO}_3$

Solution

Among the given nitrates, only $\mathrm{LiNO}_3$ will give $\mathrm{NO}_2$ on heating. While all other nitrates will give oxygen. i.e. $\mathrm{LiNO}_3 \xrightarrow{\Delta} 2 \mathrm{Li}_2 \mathrm{O}+4 \mathrm{NO}_2+\mathrm{O}_2$ $2 \mathrm{MNO}_3 \xrightarrow{\Delta} 2 \mathrm{MNO}_2+\mathrm{O}_2$ (where, $M=\mathrm{Na}, \mathrm{K}, \mathrm{Rb}$ )

Hence, the correct answer is option: 'D'.

Relevant Questions