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Question

Marsh test is used for detecting :

A
As
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B
Zn
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C
Al
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D
CH4
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Solution

The correct option is B As
Marsh test is used for the detection of arsenic. To the sample, arsenic-free zinc and sulphuric acid are added. If the sample contains arsenic, then arsine gas (AsH3) is obtained.
As2O3+6Zn+6H2SO42AsH3+6ZnSO4+3H2O

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