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What percentage of zinc oxide is present in a typical exterior white paint?

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What percentage of zinc oxide is present in a typical exterior white paint?

(a) 15% ZnO

(b) 50% ZnO

(c) 25% ZnO

(d) 10% ZnO

I got this question by my college professor while I was bunking the class.

The question is from Natural Products topic in chapter Natural Products of Chemical Technology

1 Answer

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Best answer
Right option is (c) 25% ZnO

Best explanation: A typical exterior white paint contains 15% TiO2, 25%ZnO, 50% white lead, and 10% pigment extender. Paint with this composition has self cleaning feature by a process called chalking process.

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