Question

Rama heated a mixture of iron filling and sulfur in a hard glass test tube for some time till a grey black product was found. she cooled the test tube and then added 2 ml carbon disulfide to it and shook the content of the test tube.

The observation made by her was likely to be shown above

• A. I
• B. II
• C. III
• D. IV

Answer 1

The correct option is A

I

Explanation of correct option

Rama heated a mixture of iron filling and sulfur in a hard glass test tube for some time till a grey black product was found. this product is iron sulfide.
$\mathrm{Fe}+\mathrm{S}\stackrel{∆}{\to }\mathrm{FeS}$

When 2 ml carbon disulfide is added to it There will be no reaction between ${\mathrm{CS}}_2$ and $\mathrm{FeS}$. because iron sulfide $\mathrm{FeS}$ is an ionic compound and ${\mathrm{CS}}_2$is a non-polar molecule. The solution remains colorless.

Hence, Option(A) is correct option.