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a
Plastic containers are preferred to glass bottles
b
Urea is added as preservative
c
The inside of the glass bottle is preferably coated with wax
d
All the above
answer is D.
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Detailed Solution
H2O2 is stored in wax coated glass (or) plastic bottles in drak, with a small quantity of urea as stabilizer.Presence of metal surface, traces of alkali [present in glass etc., ] increases H2O2 decomposition.