2. Sample Papers
  3. NEET

NEET Sample Paper NEET Sample Test Paper-20

  • question_answer
    Heating of ore in presence of air to remove sulphur impurities is called

    A)  Smelting                     

    B)  Roasting        

    C)       Calcination      

    D)       None of these

    Correct Answer: B

    Solution :

    Roasting is the process of heating the ore in excess supply of air below its melting point. During roasting, the following changes- occur. Moisture is driven away. Volatile impurities are removed. Impurities like sulphur, phosphorus, arsenic are removed as oxides. The ore undergoes oxidation to form metal oxide or sulphate. Hence, the correct option is (b).


You need to login to perform this action.
You will be redirected in 3 sec spinner