<P> The decision to effect the Partition of Bengal ( Bengali : বঙ্গভঙ্গ ) was announced on 19 July 1905 by the Viceroy of India , Lord Curzon . The partition took place on 16 October 1905 and separated the largely Muslim eastern areas from the largely Hindu western areas . The Hindus of West Bengal who dominated Bengal 's business and rural life complained that the division would make them a minority in a province that would incorporate the province of Bihar and Orissa . Hindus were outraged at what they recognised as a `` divide and rule '' policy , where the colonisers turned the native population against itself in order to rule , even though Curzon stressed it would produce administrative efficiency . The partition animated the Muslims to form their own national organization on communal lines . Bengal was reunited by Lord Hardinge in 1911 in an effort to appease Bengali sentiment . It was reunited for the following reasons : 1 . Swadeshi movement riots protested against it . 2 . Hindus thought the east Bengal would have their own courts and policies . </P>
who was working as the viceroy of india at the time of bengal 's separation in 1905
Lord Curzon