(D) The process described is known as $quenching$. When steel is heated to a high temperature (red heat) and then rapidly cooled by plunging it into c

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(D) The process described is known as $quenching$. When steel is heated to a high temperature (red heat) and then rapidly cooled by plunging it into cold water or oil,the internal structure of the steel changes. This rapid cooling prevents the formation of softer phases and results in the formation of martensite,which is a very hard and brittle phase of steel. Therefore,this treatment makes the steel hard and brittle.

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

Medium

$A$ piece of steel is heated until redness and then plunged into cold water or oil. This treatment of iron makes it:

A
soft and malleable
B
hard but not brittle
C
more brittle
D
hard and brittle

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Class 12

Chemistry Questions

Chapter

General Principles and Processes of Isolation of Elements

Subtopic

Mix Examples of General Principles and processes of Isolation of Elements

Match List-$I$ (Substances) with List-$II$ (Processes) used for their production.

List-$I$ (Substances) List-$II$ (Processes)

$(a)$ Sulphuric acid $(i)$ Haber process

$(b)$ Steel $(ii)$ Bessemer process

$(c)$ Sodium hydroxide $(iii)$ Leblanc process

$(d)$ Ammonia $(iv)$ Contact process

Choose the correct option for $a-b-c-d$.

List-$I$ (Substances)	List-$II$ (Processes)
$(a)$ Sulphuric acid	$(i)$ Haber process
$(b)$ Steel	$(ii)$ Bessemer process
$(c)$ Sodium hydroxide	$(iii)$ Leblanc process
$(d)$ Ammonia	$(iv)$ Contact process