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Test for Ammonia

Which of the ...

Question

Which of the following gas is a colourless gas which also bleaches?

A

H₂S

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B

SO₂

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C

SO₃

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D

O₂

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Solution

The correct option is B
SO₂

Sulphur dioxide gas is a colourless gas with a smell of burning sulphur i.e., suffocating odour. It turns moist blue litmus red and finally bleaches it. The gas turns lime water turbid.

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