Match Column-I with Column-II
(P) Nitriding
Column-II
(I) Process of heating steel to redness and then cooling it very slowly
(II) Process of heating steel in presence of \( \mathrm{NH}_{3} \) 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 querinad steel to a temperature well below reapess and then cooling it slow \( y \)
\( \begin{array}{rrrr}\mathrm{P} & \mathrm{Q} & \mathrm{R} & \mathrm{S} \\ \text { (a) } \text { II } & \text { I } & \text { III } & \text { IV }\end{array} \)
\( \begin{array}{ccccc} & \text { P } & \text { Q } & \text { R } & \text { S } \\ \text { (b) } \text { II } & \text { I } & \text { IV } & \text { III }\end{array} \)
(c) I II IV III
(d) I II III IV
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