- Home
- Standard 12
- Chemistry
General Principles and processes of Isolation of Elements
hard
Match Column $-I$ with Column $-II$
| Column $-I$ | Column $-II$ |
| $(P)$ Nitriding | $(I)$ Process of heating steel to redness and then cooling It very slowly |
| $(Q)$ Annealing | $(II)$ Process of heating steel in presence of $NH_3$ and producing hard coating of Iron Nitride on the surface of steel |
| $(R)$ Tempering | $(III)$ Process of heating steel to redness and then cooling it suddenly by plunging it into water or oil |
| $(S)$ Quenching | $(IV)$ Process of heating quenched steel to a temperature well below redness and then cooling it slowly |
A
$P-II,\,\,Q-I,\,\,R-III,\,\,S-IV$
B
$P-II,\,\,Q-I,\,\,R-IV,\,\,S-III$
C
$P-I,\,\,Q-II,\,\,R-IV,\,\,S-III$
D
$P-I,\,\,Q-II,\,\,R-III,\,\,S-IV$
Solution
Nitriding is process of heating steel in presence of $NH _3$ and producing hard coating of Iron Nitride on the surface of steel.
Annealing is process of heating steel to redness and then cooling it very slowly
Tempering is process of heating quenched steel to a temperature well below redness and then cooling it slowly
Quenching is process of heating steel to redness and then cooling it suddenly by plunging it into water or oil
Standard 12
Chemistry
