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Potassium Dichromate

Which of the ...

Question

Which of the following reactions do not result in the preparation of potassium dichromate from chromate?

(I) 4 $F e C r_{2} O_{4}$ + 8 $N a_{2} C O_{3}$ + $7 O_{2}$ $\to$
(II) $N a_{2} C r O_{4}$ + $H_{2} S O_{4}$ $\to$

(III) $N a_{2} C r_{2} O_{7}$ + $2 K C l$ $\to$

(I) and (II)

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(II) and (III)

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(I) and (III)

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(I), (II) and (III)

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Solution

The correct option is A (I) and (II)
(i) ${4 F e C r}_{4} O_{4} + 8 {N a}_{2} {C O}_{3} + 7 O_{2} \to 8 {N a}_{2} {C r O}_{4} + 2 {F e}_{2} O_{3} + 8 {C O}_{2}$

(ii) $2 {N a}_{2} {C r O}_{4} + H_{2} {S O}_{4} \to {N a}_{2} {C r}_{2} O_{7} + {N a}_{2} {S O}_{4} + H_{2} O$

(iii) ${N a}_{2} {C r}_{2} O_{7} + 2 K C l \to K_{2} {C r}_{2} O_{7} + 2 N a C l$

Suggest Corrections

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E_{2}

(I) 4 F e C r_{2} O_{4} + 8 N a_{2} C O_{3} + 7 O_{2} \to

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

(I I I) N a_{2} C r_{2} O_{7} + 2 K C l \to

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F e C r_{2} O_{4} + N a O H + a i r ⟶ (A) + F e_{2} O_{3}

(A) + (B) ⟶ N a_{2} C r_{2} O_{7}

N a_{2} C r_{2} O_{7} + X △ ⟶ C r_{2} O_{3}

C r_{2} O_{3} + Y △ ⟶ C r

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