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Q.

Select the incorrect statement

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a

Pig iron is manufactured by using blast furnace

b

Platinum, indium etc. are known as noble metals because they are inert towards many common reagents.

c

Wrought iron is the purest form of iron.

d

Passivity of iron is due to the formation of thin film of sulphides on its surface

answer is D.

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Detailed Solution

Passivity of iron is due to the formation of thin film of oxides on its surface.
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