Compound $(A)$ and $(B)$ are :

N a_{2} C r O_{4}

H_{2} S O_{4}

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N a_{2} C r_{2} O_{7}

H C l

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N a_{2} C r O_{5}

H_{2} S O_{4}

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N a_{4} [F e (O H)_{6}]

H_{2} S O_{4}

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Solution

The correct option is C $N a_{2} C r O_{4}$ , $H_{2} S O_{4}$
$F e C r_{2} O_{4}$ reacts with sodium hydroxide in presence of air to form $N a_{2} C r O_{4} (A)$
$2 F e C r_{2} O_{4} + 4 N a O H + \frac{9}{2} O_{2} \to 4 N a_{2} C r O_{4} A + F e_{2} O_{3} + 2 H_{2} O$ .
$N a_{2} C r O_{4} (A)$ and $H_{2} S O_{4} (B)$ react with each other to form $N a_{2} C r_{2} O_{7}$
$2 N a_{2} C r O_{4} A + H_{2} S O_{4} B \to N a_{2} C r_{2} O_{7} + N a_{2} S O_{4} + H_{2} O$

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Similar questions

F e C r_{2} O_{4}

N a_{2} C O_{3}

7 O_{2}

\to

N a_{2} C r O_{4}

H_{2} S O_{4}

\to

N a_{2} C r_{2} O_{7}

2 K C l

\to

H_{2} S O_{4}

N a_{2} C r_{2} O_{7} + 3 S O_{2} + H_{2} S O_{4} \to 3 N a_{2} S O_{4} + C r_{2} (S O_{4})_{3} + H_{2} O

In the following series of reactions

$N a C l + A \to B + H C l$ , $B + c o k e \to N a_{2} S + C O$

$N a_{2} S + C \to N a_{2} C O_{3} + C a S A$ , $B$ and $C$ are respectively

N a_{2} C r O_{4} + H_{2} S O_{4} \to

Choose the reaction which shows heating of metallic chloride with concentrated H₂SO_4.

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