Assertion :Green solution of potassium manganate (VI) $K_{2} M n O_{4}$ turns purple and a brown solid is precipitated when $C O_{2}$ is bubbled into the solution. Reason: $C O_{2}$ in aqueous solution gives bicarbonate and is acidic. $C O_{2} + H_{2} O ⇌ H_{2} C O_{3} ⇌ H^{+} + H C O_{3}^{-}$ (purple by oxidation) and $M n O_{2}$ (brown solid, by reduction)

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$K_{2} M n O_{4} + C O_{2} ⟶ K M n O_{4}      P u r p l e + M n O_{2}      B r o w n s o l i d + K_{2} C O_{3}$
As $C O_{2}$ in aqueous solution gives bicarbonate and thus $K_{2} M n O_{4}$ and oxidized $(K M n O_{4})$ .

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Assertion :Green solution of potassium manganate (VI) K2MnO4 turns purple and a brown solid is precipitated when CO2 is bubbled into the solution. Reason: CO2 in aqueous solution gives bicarbonate and is acidic. CO2+H2O⇌H2CO3⇌H++HCO−3 (purple by oxidation) and MnO2 (brown solid, by reduction)

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for AssertionK2MnO4+CO2⟶KMnO4Purple+MnO2Brownsolid+K2CO3As CO2 in aqueous solution gives bicarbonate and thus K2MnO4 and oxidized (KMnO4).