Question

Select the correct statement(s):

• A. Gravity separation method is used in concentration of oxide ore and carbonate ore
• B. Magnetic separation method is used for separation of non - magnetic rutile and magnetic impurity of chlorapatite
• C. $F{e}_3{O}_4$ is magnetic and impurities non - magnetic
• D. $Mn{O}_2$ is non - magnetic and impurities magnetic

Answer 1

Answer: (A), (C)

The correct options are
A Gravity separation method is used in concentration of oxide ore and carbonate ore
C $F{e}_3{O}_4$ is magnetic and impurities non - magnetic

As a general rule of thumb, gravity separation is indeed used for oxide and carbonate ores.
Rutile is definitely magnetic whereas chlorapatite is not. Likewise, $Mn{O}_2$ is magnetic.