Question

To prepare iron (II) sulphide by heating a mixture of iron filings and sulphur powder, we should use a

• A. copper dish
• B. watch glass
• C. china dish
• D. petri dish

Answer 1

The correct option is C

china dish

Explanation for the correct option:

(C) China dish: Iron (II) sulphide $\left(\mathrm{FeS}\right)$ is prepared by heating a mixture of Iron $\left(\mathrm{Fe}\right)$ filings and Sulphur $\left(\mathrm{S}\right)$ powder in a china dish.

• China dish has an almost bottom made of an insulating material called porcelain.
• It does not react with the components present in the china dish.
• It can also withstand high temperature while heating and does not break.

Explanation for the incorrect options:

(A) Copper dish: Copper is a good conductor of heat which makes it hot very quickly and unsafe to handle in the laboratory.

(B) Watch glass: It is used to evaporate a liquid, covers a beaker, or hold a small amount of a substance.

(D) Petri dish: Petri dish is used to culture micro-organisms in biology or biochemistry laboratories. It is flat at the bottom.

Hence, option (C) is correct.