Modern Indian History
Rabindranath Tagore surrendered his knighthood in protest against

Jallianwala Bagh tragedy
All listed here
Martial law in the Punjab
Rawlatt Acts

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Modern Indian History
When did M.K Gandhi participated in the Second Round Table Conference?

Signing the Gandhi-Irwin Pact of March, 1931
Fruitful talks with Sapru
Receiving assurances that independence was fast coming
Getting assurance from the Muslim League that it would not oppose his claim to represent the whole of India

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