(B) The process of heating steel to a high temperature and then cooling it slowly is known as $annealing$,not $quenching$. $Quenching$ refers to the p

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Steel can be softened by heating it to a high temperature for a prolonged time and then cooling slowly. This is called quenching.

(B) The process of heating steel to a high temperature and then cooling it slowly is known as $annealing$,not $quenching$. $Quenching$ refers to the process of cooling a material rapidly,such as by dipping it in water or oil,which makes the steel hard and brittle. Therefore,the statement in option $B$ is incorrect.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Mix Examples of General Principles and processes of Isolation of Elements

Easy

Which of the following statements is wrong?

A
Heating to a high temperature and then cooling suddenly,e.g.,by dipping in water,makes steel hard and brittle.
B
Steel can be softened by heating it to a high temperature for a prolonged time and then cooling slowly. This is called quenching.
C
Tempering of hardened steel is done by heating it to just below red heat at controlled temperature and duration.
D
Phosphorus impurity makes steel ‘cold short’.