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What is the composition of aqua-regia that corrodes noble metals such as platinum, gold?

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What is the composition of aqua-regia that corrodes noble metals such as platinum, gold?

(a) 3 parts of nitric acid and 1 part of hydrochloric acid

(b) 3 parts of hydrochloric acid and 1 part of nitric acid

(c) 1 part of hydrofluoric acid and 3 part of hydrochloric acid

(d) 3 parts of hydrofluoric acid and 1 part of hydrochloric acid

The question was asked in an online interview.

This intriguing question comes from Materials in portion Materials of Corrosion Engineering

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The correct answer is (b) 3 parts of hydrochloric acid and 1 part of nitric acid

The explanation: The composition of aqua regia is 3 parts of hydrochloric acid and 1 part of nitric acid. It corrodes/dissolves noble metals such as gold, platinum, and palladium.

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