Generally, when metals are treated with mineral acids, hydrogen gas is liberated. But, when metals (except $M n$ and $M g$ ) are treated with $H N O_{3}$ , hydrogen is not liberated. Why?

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Solution

Most of the metals do not react with $H N O_{3}$ because nitric acid is a strong oxidising agent. Hence, when metals (except $M n$ and $M g$ ) are treated with nitric acid; hydrogen gas is not liberated. Only magnesium and manganese can produce hydrogen gas with very dilute nitric acid.

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Generally, when metals are treated with mineral acids, hydrogen gas is liberated. But, when metals (except Mn and Mg) are treated with HNO3, hydrogen is not liberated. Why?

Most of the metals do not react with HNO3 because nitric acid is a strong oxidising agent. Hence, when metals (except Mn and Mg) are treated with nitric acid; hydrogen gas is not liberated. Only magnesium and manganese can produce hydrogen gas with very dilute nitric acid.

Generally, when metals are treated with mineral acids, hydrogen gas is liberated. But, when metals (except $M n$ and $M g$ ) are treated with $H N O_{3}$ , hydrogen is not liberated. Why?

Most of the metals do not react with $H N O_{3}$ because nitric acid is a strong oxidising agent. Hence, when metals (except $M n$ and $M g$ ) are treated with nitric acid; hydrogen gas is not liberated. Only magnesium and manganese can produce hydrogen gas with very dilute nitric acid.