Which of the following, on thermal decomposition, form both acidic and basic oxides along with $\mathrm{O}_2$ ?

(i) $\mathrm{NaNO}_3$

(ii) $\mathrm{Ca}\left(\mathrm{NO}_3\right)_2$

(iii) $\mathrm{Be}\left(\mathrm{NO}_3\right)_2$

(iv) $\mathrm{LiNO}_3$

The correct option is

Which one of the following alkaline earth metals does not form hydride when it is heated with hydrogen directly?

Identify the correct statements from the following.

(A) $$\mathrm{BeSO}_4$$ is soluble in water.

(B) BeO is an amphoteric oxide.

(C) CO can be obtained by heating $$\mathrm{CaCO}_3$$ at $$1070-1270 \mathrm{~K}$$.

The pair of elements that form both oxides and nitrides, when burnt in air are

Assertion (A) MgSO$$_4$$ is readily soluble in water.

Reason (R) The greater hydration enthalpy of Mg$$^{2+}$$ ions overcome is lattice enthalpy.

Identify A and B from the following reaction,

$$\mathrm{NaNO}_3 \xrightarrow{\Delta} x A+y B$$

Which of the following does not form double salts?

In the preparation of baking soda, H$$_2$$O and CO$$_2$$ in ratio ......... is used to react with Na$$_2$$CO$$_3$$.

Which metal oxide among the following gives H$$_2$$O$$_2$$ on treatment with dilute acid?

Assertion (A) K, Rb and Cs form superoxides.

Reason (R) The stability of superoxides increases from K to Cs due to decrease in lattice energy.

When borax is dissolved in water, it gives an alkaline solution. The alkaline solution consists the following products