how does baking powder make the cake soft and spongy?

What is Baking powder ?

Dough kept overnight in warm weather become soft and spongy because of

How is bleaching powder prepared ?

How does a bone move?

How can be idli made soft and smooth?

Which substance is used in bakeries to get soft and spongy cake ? What is its reaction ?

How does yeast reproduce ?

How does a stem help the plant?

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?