Question

the Chief Minister gave him a prize choose the suitable passive voice

Answer 1

A prize was given to him by the chief Minister.
OR
A prize was given by the Chief Minister to him !
Or
He was given a prize by the Chief Minister.

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Answer 2

The sentence after converting into passive voice – A prize was given to him by the Chief Minister or He was given a prize by the Chief Minister.

The sentence is given in active voice. A

n active voice can be referred as the form or set of the forms of any verb in which the subject can be typically the thing or person performing any action and it can take the direct object.