Question

Which of the following salts on heating gives a mixture of two gases?

• A. $Ba(N{O}_3{)}_2$
• B. $NaN{O}_3$
• C. $KN{O}_3$
• D. $RbN{O}_3$

Answer 1

The correct option is A $Ba(N{O}_3{)}_2$

$\left(A\right)$ $Ba(N{O}_3{)}_2$

$Reason$ : The elements in the group 2 includes beryllium($Be$), magnesium($Mg$), calcium($Ca$), strontium($Sr$), barium($Ba$) and radium($Ra$).

The group 2 nitrates, on heating, gives metal oxide, nitrogen dioxide and oxygen gas.

For example - $2Ba\left(N{O}_3{)}_2\right(s)$ $\to$ $2BaO\left(s\right)$ + $4N{O}_2\left(g\right)$ + $O_2\left(g\right)$

Group 2 nitrates also become more thermally stable down the group.