Question

Who raised the flag of independence at the congress session of 1929?

Answer 1

Jawahrlal Nehru formalised the demand of purna swaraj in Dec 1929 at the Lahore session of Congress

So I think he was the one to raise the flag.

Answer 2

Jawaharlal Nehru was chosen the president of the congress. On the midnight of December 31, 1929,he raised the first swaraj flag.