Question

Select the correct statement(s):
This question has multiple correct options
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 are non-magnetic
D.$Mn{{O}_{2}}$ is non-magnetic and impurities are magnetic.

Answer 1

Gravity suspension method is defined as an industrial method for separating two components, it can either be a suspension or dry granular mixture. The components of the mixture have different weights. It is used for removal of impurities.

Complete step-by-step answer: A. In the gravitational separation method, it is practical to separate the components with gravity. Here, they use gravity as a dominant force. In this method, the material is lifted with help of vacuum over an inclined vibrating screen covered deck. This is the working principle of gravity separation method. This method is used to remove impurities that are present in oxides and carbonates there by oxides and carbonates are concentrated. Therefore, this option is correct.
B. Magnetic separation methods use magnets to separate components of mixtures. This method is used for detaching non magnetic material with the material that is magnetic. This method is not useful for all components. It is only useful for ferromagnetic materials. These materials are strongly affected by magnetic fields. Hence, non magnetic substances are separated with this method. Therefore, this option is incorrect.
C. $F{{e}_{3}}{{O}_{4}}$which is known as magnetite is magnetic in nature and shows high conductivity whereas its impurities are non magnetic in nature. Hence, this option is correct
D. $Mn{{O}_{2}}$is magnetic in nature and shows high conductivity whereas its impurities are non magnetic in nature. Therefore, this option is incorrect.

Hence, the correct options are A and C.

Note: It is necessary to understand the meaning of ferromagnets and ferromagnetism. Ferromagnetism is defined as a mechanism where specific materials are attracted to magnets. It is responsible for the phenomenon of magnetism in magnets. Ferromagnets are the materials that follow this phenomenon. Examples of these materials are iron, cobalt.