Q. $K_{2} C r_{2} O_{7}$ in acidic medium converts into

3114 219 AIIMSAIIMS 2013The d-and f-Block Elements Report Error

A

$C r^{2 +}$

19%

B

$C r^{3 +}$

69%

C

$C r^{4 +}$

7%

D

$C r^{5 +}$

5%

Solution:

$C r_{2} O^{2 -} + 14 H^{+} + 6 e^{-} \to 2 C r^{3 +} + 7 H_{2} O$