Which of the following option is incorre...

Which of the following option is incorrect

A

`Fe_(2)O_(3)` can be reduce by coke as well as aluminium.

B

Red bauxite is concentrate by leaching method.

C

Impure Zn is purified by either distilation or electrolytic refining method

D

Pig rion is a purest form of iron.

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The correct Answer is:

D

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