Multiple choice

Which of the following statements is/are false? P. Sulphide ores are concentrated by froth floatation process. Q. Calcination is the process of heating the ores strongly in the presence of excess air. R. Roasting is the process of heating the ores strongly in the absence of air. S. The impurities present in the ores are called gangue.

  1. Only P

  2. P and Q

  3. Only R

  4. Q and R

  5. R and S
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because calcination is the process of heating the ores strongly in the absence of air and roasting is the process of heating the ores strongly in the presence of excess air.

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