Single Choice

Which of the following reactions do not result in the preparation of potassium dichromate from chromate? (I) 4$$FeCr_2O_4$$ + 8$$Na_2CO_3$$+ $$7O_2$$$$\rightarrow$$ (II) $$Na_2CrO_4$$ + $$H_2SO_4$$ $$\rightarrow$$ (III) $$Na_2Cr_2O_7$$+ $$2KCl$$$$\rightarrow$$

A(I) and (II)
Correct Answer
B(II) and (III)
C(I) and (III)
D(I), (II) and (III)

Solution

(i) $${ 4FeCr }_{ 4 }{ O }_{ 4 }+8{ Na }_{ 2 }{ CO }_{ 3 }+7{ O }_{ 2 }\rightarrow 8{ Na }_{ 2 }{ CrO }_{ 4 }+2{ Fe }_{ 2 }{ O }_{ 3 }+8{ CO }_{ 2 }$$

(ii) $$2{ Na }_{ 2 }{ CrO }_{ 4 }+{ H }_{ 2 }{ SO }_{ 4 }\rightarrow { Na }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }+{ Na }_{ 2 }{ SO }_{ 4 }+{ H }_{ 2 }O$$

(iii) $${ Na }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }+2KCl\rightarrow { K }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }+2NaCl$$

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