Question

Mr. Das is _ his chamber ( at / on / in ) ​

Answer 1

Mr. Das is in his chamber .

Explanation:

The preposition of place can be understood with three articles namely “in”, “on” and “at”.

The preposition “in” is used along with the following:

Name of the country –  Example: In America

Name of the city – Example: In Chennai

To depict neighborhood – Example: In Manhattan

Enclosed space – Example: In the cinema

In the given sentence Das is spotted in a Chamber which is a enclosed space, thus it is right to say that Mr.Das is in his chamber.