Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Addition of high proportions of manganese makes steel useful in making rails of rail roads, because manganese (1) gives hardness to steel (2) helps the formation of oxides of iron (3) can remove oxygen and sulphur (4) can show highest oxidation state of +7A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: D
Solution :
Manganese when added to steel, provides it hardness and can remove oxygen and sulphur from it.
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