Question

Read the following statements carefully.

(I) Sulphide ores are converted into oxides by heating strongly in the absence of air or oxygen.

(II) Impurities such as soil, sand etc, present in ores are called gangue.

Now, choose the correct option.

• A.
  Only statement (I) is correct
• B.
  Only statement (II) is correct
• C.
  Both the statements are correct
• D.
  Both the statements are incorrect

Answer 1

The correct option is B

Only statement (II) is correct
Sulphide ores are converted into oxides by heating strongly in the presence of excess air because it is easier to obtain metal from its oxide, as compared to its sulphides. This process is called roasting. Ores mined from the earth contain large amounts of impurities such as soil, sand, etc., called gangue, which must be removed from the ore before the extraction of the metal.

Hence, the correct answer is option (b).