Statement-I: In the reaction of Fe2+aq. with Cr2O72-aq. the O.N. of Cr changes from +7 to +3. Statement-II: The reaction of Fe2+aq. with Cr2O72-aq. is a redox reaction.

# Statement-I: In the reaction of  ${\mathrm{Cr}}_{2}{\mathrm{O}}_{7}^{2-}\left(\mathrm{aq}.\right)$ the O.N. of Cr changes from +7 to +3. Statement-II: The reaction of  ${\mathrm{Cr}}_{2}{\mathrm{O}}_{7}^{2-}\left(\mathrm{aq}.\right)$ is a redox reaction.

1. A

Both Statement-I and Statement-II are correct

2. B

Statement-I is correct and Statement-II is incorrect

3. C

Statement-I is incorrect and Statement-II is correct

4. D

Both statement-I and Statement-II are incorrect

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### Solution:

$\stackrel{+6}{{\mathrm{Cr}}_{2}}{O}_{7}$ gives $\stackrel{+3}{\mathrm{Cr}}$

$6{\mathrm{Fe}}^{2+}\left(\mathrm{aq}\right)+{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}^{2-}\left(\mathrm{aq}\right)+14{\mathrm{H}}^{+}\left(\mathrm{aq}\right)\to 2{\mathrm{Cr}}^{3+}\left(\mathrm{aq}\right)+7{\mathrm{H}}_{2}\mathrm{O}\left(\mathrm{l}\right)$$+6 {\mathrm{Fe}}^{+3}$

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