Q. $K_{2} C r_{2} O_{7}$ on heating with aqueous $N a O H$ gives

1952 182 The d-and f-Block Elements Report Error

A

$C r_{4}^{2 -}$

B

$C r (O H)_{3}$

C

$C r_{2} O_{4}^{2 -}$

D

$C r (O H)_{2}$

Solution:

Correct answer is (a) $C r_{4}^{2 -}$