Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of

Question

Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of (A) CrO2-4  (B) Cr2(SO3)3  (C) CrSO4  (D) Cr2(SO4)3

Tardigrade Admin · Accepted Answer

K 2 Cr 2 O 7 is oxidising reagent. K 2 Cr 2 O 7 +3 Na 2 SO 3+4 H 2 SO 4 longrightarrow 3 Na 2 SO 4+ K 2 SO 4+ Cr 2( SO 4)3+4 H 2 O

Q. Acidified $K_{2} C r_{2} O_{7}$ solution turns green when $N a_{2} S O_{3}$ is added to it. This is due to the formation of

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

$C r_{2} (S O_{3})_{3}$

$C r S O_{4}$

$C r_{2} (S O_{4})_{3}$

$K_{2} C r_{2} O_{7}$ is oxidising reagent.
$K_{2} C r_{2} O_{7} + 3 N a_{2} S O_{3} + 4 H_{2} S O_{4} ⟶ 3 N a_{2} S O_{4} + K_{2} S O_{4} + C r_{2} (S O_{4})_{3} + 4 H_{2} O$

Q. Acidified K2​Cr2​O7​ solution turns green when Na2​SO3​ is added to it. This is due to the formation of

CrO42−​

Cr2​(SO3​)3​

CrSO4​

Cr2​(SO4​)3​