Assertion :While blowing a soap bubble, to increase the size of a soap bubble, we have to increase the air pressure within the soap bubble.
Reason :To increase the size of soap bubble, more air has to be pushed into the bubble.

We know that to increase the size of soap bubble, more air has to be pushed into the bubble i.e. the reason is true. But pushing more air increases the size of the bubble, in turn increasing the radius of the bubble. And we know that excess pressure is inversely proportional to the radius of the bubble. That means, pressure inside bubble decreases as we increase the size of the bubble since pressure outside the bubble is always equal to atmospheric pressure. Hence assertion is incorrect but Reason is correct.