Question

In the isolation of metals, the Calcination process usually results in formation of……
(A) Metal Hydroxide
(B) Metal Oxide
(C) Metal Carbonate
(D) Metal Sulphide

Answer 1

Hint:
In Calcination, ore is heated at very high temperatures in the presence of air. There are no other reagents added during the process of calcination except air.

Complete step-by-step answer:
- Calcination is a process in which the ore is heated at very high temperatures in limited presence of oxygen. So, Basically it is a Decomposition reaction. Nothing is added or substituted in the molecule during this process.
- So, when an ore undergoes a calcination process it gives Metal Oxides as the product.
E.g. \[CaC{O_3}\xrightarrow{{Heat}}CaO + C{O_2}\]
So, Correct answer is (B) Metal Oxide
- Also in case you don’t know the right answer, but knowing that it is a kind of a decomposition reaction, then we should not choose Metal carbonates as they easily get decomposed into oxides, so they themselves cannot be obtained as an end product of the calcination process.
- Usually Metal oxides have the highest stability against heat out of the compounds given in the options.

Additional Information:
Below are the examples of the calcination reaction used in industries.
- Phase transformation of some materials
- Decomposition of minerals that have water of crystallization i.e. removes water content from hydrated ores
- Decomposition of carbonate ores of metal
- Refining of fuels i.e. to remove volatile materials from petroleum coke

Note:
- Do not get confused by different isolation methods available. Just try and relate the name of the process to the reaction which is occurring the particular method.