Question

In a bakery, baking powder was not added while preparing cake the cake obtained was hard and small in size. what is the reason for this?

Answer 1

Because a key ingredient was obviously missed.

Baking powder is a chemical leavening agent. The really short version is that it magically causes the cake to rise by the release of gas.

Basically it is a chemical way of inflating your cake like a balloon.

Not having this leavening agent will cause your cake to indeed be harder and smaller in size.

(Baking powder is a dry chemical leavening agent, a mixture of a carbonate or bicarbonate and a weak acid.)