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A colored gas is observed with which combination?

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Calcium hydride and water

Lead metal and nitric acid

Sodium carbonate and sulfuric acid

Zinc sulfide and hydrochloric acid

answer is B.

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Detailed Solution

A colored gas is observed with the combination of Lead metal and nitric acid.

Lead (II) nitrate, nitrogen oxide, and water are produced when lead reacts with nitric acid. In which the nitrogen oxide is the colorless gas.

Hence, the correct option is B.

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