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Q.

An alloy reacted with dilute hydrochloric acid to produce a gas that ‘pops’ a lighted splint. The residue reacted with dilute nitric acid to form a blue solution. Which one of the following pairs of metals is present in the alloy?

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a

Copper and magnesium

b

Lead and zinc

c

Copper and lead

d

Lead and magnesium

answer is C.

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Detailed Solution

Zinc reacts with hydrochloric acid to form hydrogen gas which pops a lighted splint. The residue is copper and magnesium when it reacts with dilute nitric acid to form a blue solution.

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