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.
Create a free account to view solution
View Solution FreeMore s-Block Elements Questions
Chemical (A) is used for water softening to remove temporary hardness. A reacts with Na2 CO3 to generate caustic soda. W...When hydrated MgCl2. 6H2O is strongly heated :...Consider the following statements ;S1 : Beryllium and Magnesium are inert to oxygen and water. S2 : Concentrated solutio...The more commonly used baking powder contains about 30% NaHCO3, 20% NaAl(SO4)2 10% Ca(H2PO4)2 and 40% starch. Which of t...Consider the following statements ;S1 : Ozone reacts with dry KOH forming a deep red/orange coloured compound and libera...