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Which of the following gases turns the a...

Which of the following gases turns the acdified potassium dischromate paper green

A

`HCl `

B

`H_2S`

C

`CO_2`

D

`SO_2`

Text Solution

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The correct Answer is:
B, D
`H_2S and SO_2` are reducing agents which reduce `underset(("Orange")) (Cr_2O_7^(2-)) " to " underset(("Green"))(Cr^(3+))`.
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