Which one of the following statements is correct when is passed through acidified solution? [2016]

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Solution

Q.
Which one of the following statements is correct when $S O_{2}$ is passed through acidified $K_{2} C r_{2} O_{7}$ solution [2016]

1 $S O_{2}$ is reduced.

2 Green $C r_{2} {(S O_{4})}_{3}$ is formed.

3 The solution turns blue.

4 The solution is decolourised.

Ans.
(2)

$K_{2} {Cr}_{2} O_{7} + H_{2} {SO}_{4} + 3 {SO}_{2} ⟶ K_{2} {SO}_{4} + \underset{(Green)}{{Cr}_{2} {({SO}_{4})}_{3}} + H_{2} O$

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Solution

Q. Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution [2016]

1 SO2 is reduced.

2 Green Cr2(SO4)3 is formed.

3 The solution turns blue.

4 The solution is decolourised.

Ans. (2) K2Cr2O7+H2SO4+3SO2 ⟶ K2SO4+Cr2(SO4)3(Green)+H2O

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Q.
Which one of the following statements is correct when $S O_{2}$ is passed through acidified $K_{2} C r_{2} O_{7}$ solution [2016]

1 $S O_{2}$ is reduced.

2 Green $C r_{2} {(S O_{4})}_{3}$ is formed.

Ans.
(2)

$K_{2} {Cr}_{2} O_{7} + H_{2} {SO}_{4} + 3 {SO}_{2} ⟶ K_{2} {SO}_{4} + \underset{(Green)}{{Cr}_{2} {({SO}_{4})}_{3}} + H_{2} O$