When did the partition of Bengal take place?

The correct answer is 1905.

Partition of Bengal (1905) was a territorial reorganization of the Bengal Presidency that separated the predominantly Hindu western areas from the predominantly Muslim eastern areas. Partition of Bengal was announced by Lord Curzon, the then-Viceroy of India, on July 20, 1905. The reorganization took effect on October 16, 1905. It was one of the most significant events in Indian history, which shaped India’s national movement.