s-Block ElementsHard

Question

Select the correct statement with respect to sodium peroxide ?

Options

A.It decolourises the acidifed KMnO4 solution.
B.On heating with oxygen at 450oC 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 400oC.
D.It gives both hydrogen peroxide and oxygen gas with water as well as with sulphuric acid.

Solution

(A) 2MnO4- (pink) + 16H+ + 5 O22- →  2Mn2+ + 8 H2O + 5O2.
(B) Na2O2 + O2 2NaO2 (O2- contains one unpaired electron in π* MO).
(C) 2 Na2O Na2O2 + 2 Na.
(D) gives only H2O2.

Create a free account to view solution

View Solution Free
Topic: s-Block Elements·Practice all s-Block Elements questions

More s-Block Elements Questions

Which of the following product is formed when four moles of NO gas reacts with two moles of potassium hydroxide?...Property(ies) of all the alkali metals that increase(s) with their atomic number is (are) :...Sodium metal can be stored under :...Amongst the following hydroxides, the one which has the lowest value of Ksp at ordinary temperature is :...Consider the following statements, S1 : Gypsum contains a lower percentage of calcium than plaster of pairs. S2 : Plaste...