NEET Chemistry: General Principles of Metallurgy questions with solutions

Q1. Casseterite ore consists of magnetic impurity named as:

1. chromite
2. wolframite
3. magnetite
4. Limonite

Answer: magnetite

Cassiterite (SnO2) is often associated with magnetic impurities, and magnetite is the strongly magnetic iron oxide commonly present. Because of its magnetic nature, it can be separated from cassiterite by magnetic separation.

Q2. In the purification of zirconium by Van Arkel process which halogen is used?

1. Flourine
2. Chlorine
3. Bromine
4. lodine

Answer: lodine

In the Van Arkel process, impure zirconium is converted into a volatile tetrahalide and then decomposed on a hot filament to deposit pure metal. The halogen used is iodine because zirconium iodide is sufficiently volatile for this transport step.

Q3. Ores contain a large amount of impurities, which is called as:

1. ore
2. gangue
3. dust
4. particulate

Answer: gangue

Gangue is the name for the unwanted impurities present in an ore. The ore is the valuable mineral itself, while gangue is the non-useful material mixed with it.

Q4. Iron pipes are often coated with a layer of Zinc in order to prevent them from corrosion. This process is termed as:

1. electroplating
2. annealing
3. galvanization
4. vulcanization

Answer: galvanization

Coating iron or steel with zinc protects it from corrosion because zinc acts as a barrier and also corrodes preferentially. This zinc-coating process is called galvanization.