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.
(B) Na2O2 + O2
2NaO2 (O2- contains one unpaired electron in π* MO).(C) 2 Na2O
Na2O2 + 2 Na.(D) gives only H2O2.
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