Question

Consider the following statements.

i. $\mathrm{Fe}$ filings can be separated from $\mathrm{FeS}$by rolling a magnet over $\mathrm{FeS}$.

ii.$\mathrm{S}$ powder can be separated from $\mathrm{FeS}$ by dissolving $\mathrm{FeS}$in Carbon disulphide.

iii. A mixture of $\mathrm{Fe}$ filings and $\mathrm{S}$ powder can be separated either by a magnet or by using Carbon disulphide.

Identify the correct statements:

• A. (i) and (iii)
• B. (ii) and (iii)
• C. (i) and (ii)
• D. (iii) only

Answer 1

The correct option is A

(i) and (iii)

Explanation for the correct option:

1. $\mathrm{Fe}$ (Iron) filings can be separated from $\mathrm{FeS}$(Iron sulphide) by rolling a magnet over $\mathrm{FeS}$because $\mathrm{FeS}$ is not attracted towards magnet but, $\mathrm{Fe}$ filings will be attracted towards magnet and can easily be separated therefore, first statement is correct.
2. The statement (ii), i.e., $\mathrm{S}$(Sulphur) powder can be separated from $\mathrm{FeS}$ by dissolving $\mathrm{FeS}$in Carbon disulphide $\left({\mathrm{CS}}_2\right)$ is incorrect because Iron Sulphide does not dissolves in Carbon disulphide $\left({\mathrm{CS}}_2\right)$.
3. The last statement i.e., a mixture of $\mathrm{Fe}$ filings and $\mathrm{S}$ powder can be separated either by a magnet or by using Carbon disulphide is also correct because Iron is magnetic and can be separated by rolling magnet over it and Sulphur $\left(\mathrm{S}\right)$ is soluble in Carbon disulphide $\left({\mathrm{CS}}_2\right)$.

Explanation for the incorrect options:

Option (B) is incorrect as the combination of statement (ii) and (iii) should not be the correct choice as statement (ii) is a wrong statement.

Option (C) is incorrect as the combination of statement (i) and (ii) should not be the correct choice as statement (ii) is a wrong statement.

Option (D) is incorrect because both the statements (i) and (iii) are correct but not just statement (iii), therefore this option will be a wrong choice.

Hence, option (A) is correct.