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Which of the following pigment is an anti-corrosive pigment?

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Which of the following pigment is an anti-corrosive pigment?

(a) Prussian blue

(b) Zinc chrome

(c) Titanium dioxide

(d) Carbon black

The question was asked in a job interview.

My question is based upon Natural Products topic in division Natural Products of Chemical Technology

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The correct option is (b) Zinc chrome

The best I can explain: Apart from prime pigments Ultramarine blue, Prussian blue, phthalocyanine blue, titanium dioxide, carbon black etc anti-corrosive pigments like zinc chrome and basic lead sulfates are developed.

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