Select the correct statement with respect to sodium peroxide ?

Options

A. It decolourises the acidifed `KMnO_4` solution
B. On heating with oxygen at `450^@C` and 300 atm pressure, it becomes paramagnetic
C. It is obtained along with sodium metal, when sodium oxide is heated to a temperature more than `400^@C`
D. It gives both hydrogen peroxide and oxygen gas with water as well as with sulphuric acid.

Answer

A,B,C

Explanation

(A)`2MnO_4^(-)("pink")+16H^(+)+5O_2^(2-)to2Mn^(2+) + 8 H_2O +5O_2`
(B)`Na_2O_2 + O_2 underset(300^@ "atm")overset(gt 450^@C)to2NaO_2` (`O_2^(-)` contains one unpaired electron in `pi^(**)MO`).
(C )`2Na_2O overset(400^@C)toNa_2O_2 + 2Na`
(D) gives only `H_2O_2`