Assertion : ${C O}_{2}$ containing $H_{2} O$ changes yellow ${C r O}_{4}^{2 -}$ into ${C r}_{2} O_{7}^{2 -}$ . Reason: Aqueous ${C O}_{2}$ is acidic $(H_{2} {C O}_{3} ⇌ H^{+} + {H C O}_{3}^{-})$ which converts ${C r O}_{4}^{2 -}$ into ${C r}_{2} O_{7}^{2 -}$ .

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
Chromate ion is yellow in colour whereas dichromate ion is orange in colour. When an acid is added to a solution of chromate ion, the colour changes from yellow to orange due to formation of dichromate ion.
${C O}_{2}$ containing $H_{2} O$ changes yellow ${C r O}_{4}^{2 -}$ into orange ${C r}_{2} O_{7}^{2 -}$ as aqueous ${C O}_{2}$ is acidic
$(H_{2} {C O}_{3} ⇌ H^{+} + {H C O}_{3}^{-})$
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Assertion :CO2 containing H2O changes yellow CrO2−4 into Cr2O2−7. Reason: Aqueous CO2 is acidic (H2CO3⇌H++HCO−3) which converts CrO2−4 into Cr2O2−7.

Assertion : ${C O}_{2}$ containing $H_{2} O$ changes yellow ${C r O}_{4}^{2 -}$ into ${C r}_{2} O_{7}^{2 -}$ . Reason: Aqueous ${C O}_{2}$ is acidic $(H_{2} {C O}_{3} ⇌ H^{+} + {H C O}_{3}^{-})$ which converts ${C r O}_{4}^{2 -}$ into ${C r}_{2} O_{7}^{2 -}$ .