Question

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

• A. Ba(NO3)2
• B. NaNO3
• C. KNO3
• D. RbNO3

Answer 1

Answer: (A)

Ba(NO3)2

Answer 2

Ba(NO3)2 $\overset{\quad\Delta\quad}{\rightarrow}$ BaO + 2NO2 + $\frac{1}{2}$O2 ; Alkali metal nitrates gives only O2 gas.

Alkali metal nitrates give only O2 on heating below 500ºC according to following reaction,

MNO3 $\longrightarrow$MNO2 + $\frac{1}{2}$O2