प्रार्थना समाज की स्थापना कहाँ और किस वर्ष हुई थी?

The Young Bengal Movement (1809-1831), which encouraged free thought, rationalism, and the ideals of liberty and equality among Bengal's youth, was started by which teacher and poet?

To reform the caste-ridden society and to promote social equality, a call for 'one caste, one religion and one god for all human beings' was given by ________.