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Question

A green solution of potassium manganate (VI) turns purple and a brown solid is precipitated, when CO2 gas is bubbled through the solution.

The above change is observed when CO2 gas is passed into an aqueous solution of the given ion. The function of CO2 is:

A
It makes the solution acidic due to the formation of H2CO3
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B
It makes the solution basic due to the formation of O23
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C
It is simply the medium of the reaction
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D
None of the above is correct
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Solution

The correct option is A It makes the solution acidic due to the formation of H2CO3
It makes the solution acidic due to the formation of H2CO3.

CO2+H2OH2CO3carbonic acid

3K2MnO4+2CO22KMnO4purple+MnO2(brown solid)+2K2CO3

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