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Question

Which metal(s) out of the following reacts with very dilute nitric acid to produce nitric acid?


A

Aluminium (Al)

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B

Manganese (Mn)

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C

Magnesium (Mg)

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D

Sodium (Na)

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Solution

The correct options are
B

Manganese (Mn)


C

Magnesium (Mg)


Magnesium (Mg) and manganese (Mn) are the only metals that react with very dilute nitric acid ( 1% nitric acid) to liberate hydrogen gas. With other metals, nitric acid is not used even in its dilute form because it is a strong oxidizing agent and oxygen formed due to decomposition oxidizes the hydrogen to give water, thus defeating the purpose of the reaction.


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