Addition of high proportions of manganese makes steel useful in making rails of railroads, because maruganese(I) give hardness to steel(II) helps the formation of oxides of iron(m) can remove oxygen and sulphur(IV) can show highest oxidation state of +7
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a
(I), (II) and (III)
b
(II) and (IV)
c
(I) and (III)
d
(I), (III) and (IV)
answer is C.
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Detailed Solution
Manganese steel, an alloy of exceptional durability that found uses in the construction of railroad rails and rock-crushing machinery. Manganese steel containing 12 - 14 per centmanganese, it provides a hard, wear-resistant etc.