Assertion :In acidic medium, $K_{2} C r_{2} O_{7}$ exists as $C r_{2} O_{7}^{2 -}$ (orange) while in basic medium it is converted to $C r O_{4}^{2 -}$ (yellow). Reason: $K_{2} C r_{2} O_{7}$ is hygroscopic in nature and changes colour on reaction with water.

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 C Assertion is correct but Reason is incorrect
In acidic medium :
Cr $_{2} O_{7}^{2 -}$ (orange) +14 H $^{+}$ $\to$ 2Cr $^{3} +$ (colourless) +7 H $_{2}$ O
In Basic Medium:
Cr $_{2} O_{7}^{2 -}$ (orange) +2 OH $^{-}$ $\to$ 2CrO $_{4}^{2 -}$ (yellow) +H $_{2}$ O
So, change in color is due to formation of different ions in different mediums.

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Reason (R) Addition of water in acidic medium proceeds through the formation of primary carbocation.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
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Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

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Assertion :In acidic medium, K2Cr2O7 exists as Cr2O2−7 (orange) while in basic medium it is converted to CrO2−4(yellow). Reason: K2Cr2O7 is hygroscopic in nature and changes colour on reaction with water.

The correct option is C Assertion is correct but Reason is incorrectIn acidic medium : Cr2O2−7(orange) +14 H+ → 2Cr3+ (colourless) +7 H2OIn Basic Medium:Cr2O2−7(orange) +2 OH− → 2CrO2−4(yellow) +H2OSo, change in color is due to formation of different ions in different mediums.

Assertion :In acidic medium, $K_{2} C r_{2} O_{7}$ exists as $C r_{2} O_{7}^{2 -}$ (orange) while in basic medium it is converted to $C r O_{4}^{2 -}$ (yellow). Reason: $K_{2} C r_{2} O_{7}$ is hygroscopic in nature and changes colour on reaction with water.