When a mixture of NaCl , K 2 Cr 2 O 7 and conc. H 2 SO 4 is heated in a dry test tube, a red vapor (X) is evolved. This vapor (X) turns an aqueous solution of NaOH yellow due to the formation of Y . X and Y, respectively, are:

Question

When a mixture of NaCl , K 2 Cr 2 O 7 and conc. H 2 SO 4 is heated in a dry test tube, a red vapor (X) is evolved. This vapor (X) turns an aqueous solution of NaOH yellow due to the formation of Y . X and Y, respectively, are: (A) CrCl 3 and Na 2 Cr 2 O 7 (B) CrCl 3 and Na 2 CrO 4 (C) CrO 2 Cl 2 and Na 2 CrO 4 (D) Cr 2( SO 4)3 and Na 2 Cr 2 O 7

Tardigrade Admin · Accepted Answer

4 NaCl + K 2 Cr 2 O 7+6 H 2 SO 4 arrow 4 NaHSO 4+2 KHSO 4 +2 CrO 2 Cl 2( X )+6 H 2 O CrO 2 Cl 2+4 NaOH longrightarrow Na 2 CrO 4( Y )+2 NaCl +2 H 2 O X = CrO 2 Cl 2 Y = Na 2 CrO 4

Q. When a mixture of $N a Cl, K_{2} C r_{2} O_{7}$ and conc. $H_{2} S O_{4}$ is heated in a dry test tube, a red vapor (X) is evolved. This vapor (X) turns an aqueous solution of $N a O H$ yellow due to the formation of $Y . X$ and $Y$ , respectively, are:

$C r C l_{3}$ and $N a_{2} C r_{2} O_{7}$

$C r C l_{3}$ and $N a_{2} C r O_{4}$

$C r O_{2} C l_{2}$ and $N a_{2} C r O_{4}$

$C r_{2} (S O_{4})_{3}$ and $N a_{2} C r_{2} O_{7}$

$4 N a Cl + K_{2} C r_{2} O_{7} + 6 H_{2} S O_{4} \to 4 N a H S O_{4} + 2 KH S O_{4}$
$+ 2 C r O_{2} C l_{2} (X) + 6 H_{2} O$
$C r O_{2} C l_{2} + 4 N a O H ⟶ N a_{2} C r O_{4} (Y) + 2 N a Cl + 2 H_{2} O$
$X = C r O_{2} C l_{2}$
$Y = N a_{2} C r O_{4}$

Q. When a mixture of NaCl,K2​Cr2​O7​ and conc. H2​SO4​ is heated in a dry test tube, a red vapor (X) is evolved. This vapor (X) turns an aqueous solution of NaOH yellow due to the formation of Y.X and Y, respectively, are:

CrCl3​ and Na2​Cr2​O7​

CrCl3​ and Na2​CrO4​

CrO2​Cl2​ and Na2​CrO4​

Cr2​(SO4​)3​ and Na2​Cr2​O7​