Write the balanced chemical equation for the reaction $K_{2} C r_{2} O_{7}$ and Ferrous sulphate.

(i)

C r_{2} O_{7}^{- 2} + 6 F e^{+ 2} + 14 H^{\oplus} \to 2 C r^{+ 3} + 6 F e^{+ 3} + 7 H_{2} O

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(i)

2 C r_{2} O_{7}^{- 2} + 6 F e^{+ 2} + 16 H^{\oplus} \to 4 C r^{+ 3} + 6 F e^{+ 3} + 8 H_{2} O

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(i)

C r_{2} O_{7}^{- 2} + 8 F e^{+ 2} + 16 H^{\oplus} \to 2 C r^{+ 3} + 8 F e^{+ 3} + 8 H_{2} O

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None of these

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Solution

The correct option is B (i) $C r_{2} O_{7}^{- 2} + 6 F e^{+ 2} + 14 H^{\oplus} \to 2 C r^{+ 3} + 6 F e^{+ 3} + 7 H_{2} O$
Option (A) is correct. In presence of dilute sulphuric acid, potassium dichromate oxidizes ferrous sulphate to ferric sulphate, potassium dichromate is reduced to chromium sulphate. Orange colour of solution turns green. The balanced chemical reaction is as shown.
$6 F e S O_{4} + K_{2} C r_{2} O_{7} + 7 H_{2} S O_{4} ⟶ 3 F e_{2} (S O_{4})_{3} + K_{2} S O_{4} + C r_{2} (S O_{4})_{3} + 7 H_{2} O$
The net ionic equation is as shown.
$C r_{2} O_{7}^{- 2} + 6 F e^{+ 2} + 14 H^{+} \to 2 C r^{+ 3} + 6 F e^{+ 3} + 7 H_{2} O$

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Similar questions

Q. Balance by Ion electon method,

C r_{2} O_{7}^{- 2} + F e^{+ 2} \to C r^{+ 3} + H_{2} O

(in acidic medium).

How many $H_{2} O$ should be added to the RHS of the following equation to balance number of oxygen atoms on the left ?

$6 F e^{2 +} + C r_{2} O_{7}^{2 -} + 14 H^{+} ⟶ 6 F e^{3 +} + 2 C r^{3 +} +$ ___________

Q. Complete the following reactions.

(i) C r_{2} O_{7}^{2 -} + 3 S O_{2} + 2 H^{+} \to 2 C r^{3 +} +

____

+ H_{2} O

(i i) 2 M n O_{4}^{-} + 5 S O_{3}^{2 -} + 6 H^{+} \to 2 M N^{2 +} +

____

3 H_{2} O

(i i i) C r_{2} O_{7}^{2 -} + 6 F e^{2 +} + 14 H^{+} \to 2 C r^{3 +}

____

7 H_{2} O

Q. Complete the following chemical equation:
(i)

C r_{2} O_{7}^{2 -} + 6 F e^{2 +} + 14 H^{+} \to

(ii)

2 C r O_{4}^{2 -} + 2 H^{+} \to

(iii)

2 M n O_{4}^{-} + 5 C_{2} O_{4}^{2 -} + 16 H^{+} \to

Q. In acidic medium

C r_{2} O_{7}^{- 2}

is an oxidising agent

C r_{2} O_{7}^{- 2} + 14 H^{+} + 6 e^{-} \to 2 C r^{+ 3} + 7 H_{2} O

[E^{\circ} {C r}_{2} O_{7}^{- 2} / C r^{+ 3} = 1.33 V]

The electrode potential of half cell at pH = 1 keeping concentration of other species unity is:

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Write the balanced chemical equation for the reaction K2Cr2O7 and Ferrous sulphate.

Write the balanced chemical equation for the reaction $K_{2} C r_{2} O_{7}$ and Ferrous sulphate.