Match Column-I with Column-II
Column-I
(P) Nitriding
(Q) Annealing
(R) Tempering
(S) Quenching
Column-II
(I) Process of heating steel to redness and then cooling it very slowly

Question

Match Column-I with Column-II
Column-I
(P) Nitriding
(Q) Annealing
(R) Tempering
(S) Quenching
Column-II
(I) Process of heating steel to redness and then cooling it very slowly
(II) Process of heating steel in presence of NH3 and producing hard coating of Iron Nitride on the surface of steel
(III) Process of heating steel to redness and then cooling it suddenly by plunging it into water or oil
(IV) Process of heating quenched steel to a temperature well below redness and then cooling it slowly

Prashant Kotian · Accepted Answer

Correct answer: B. Step 1: Chromite ore is processed to obtain chromium(III) oxide (Cr2O3). Step 2: Chromium is extracted by the reduction of Cr2O3 via the alumino-thermite process: Cr2O3 + 2Al -> Al2O3 + 2Cr. Step 3: Therefore, aluminium powder is used as the reducing agent, which corresponds to option (c).

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