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(a) Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid. (b) Name two metals

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(a) Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid.

(b) Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.

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Metals do not liberate hydrogen gas with nitric acid because nitric acid is a strong oxidizing agent. So, as soon as hydrogen gas is formed in the reaction between a metal and dilute nitric acid, the nitric acid oxidises this hydrogen to water.

(b) Magnesium and manganese.

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