When Na2O2 is kept in moist air it appears white due to presence of :
NaOH
Na2CO3
both a & b
NaHCO3
As we learnt ,
Reaction of Na2 O2 with moist air -
Becomes white due to the formation of NaOH and
- wherein
Na2O2 reacts with moist air and forms NaOH & Na2CO3 due to which it becomes white .