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There are four packets of bleaching powd...

There are four packets of bleaching powder, baking powder, washing soda, p.o.p in a shop. Which question is suitable to pose to select correct pack for cooking?

A

`a`. Which one produces `H_2`, gas on heating?

B

`b`. Which one produces `CO_2`, gas on heating?

C

`c`. Which one produces `Cl`, gas on heating?

D

`d`. Which one produces `O_2`, on heating?

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