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Question

In brown ring test, a freshly prepared ferrous sulphate solution is used because:


A

Ferrous sulphate when exposed to atmosphere oxidizes to ferric sulphate.

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B

Ferrous sulphate when exposed to atmosphere reduces to ferric sulphate.

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C

Ferric sulphate doesn't give a brown ring.

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D

Ferric sulphate will also give a brown ring but will not stay for a longer times.

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Solution

The correct options are
A

Ferrous sulphate when exposed to atmosphere oxidizes to ferric sulphate.


C

Ferric sulphate doesn't give a brown ring.


In brown ring test, a freshly prepared ferrous sulphate solution is used because on exposure to the atmosphere , it oxidizes to ferric sulphate which will not give brown ring.

12FeSO4+3O2>4Fe2(SO4)3+2Fe2O3


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