The Marsh test is described as follows :

In this test, if ${\mathrm{SbH}}_3$ and ${\mathrm{BiH}}_3$ mixture is sent then Which of the following statement is correct?

 

The Marsh test is an arsenic detection technique that is so sensitive that it may be used to find trace quantities of arsenic in food or the contents of the stomach. The sample is put in a flask with sulfuric acid and zinc devoid of arsenic.

In this test, if  ${\mathrm{SbH}}_3$ and ${\mathrm{BiH}}_3$ the mixture is sent then Sb and Bi both will be deposited at the left 

Hence the correct option is D.