why no hydrogen gas is released when metal react with dilute nitric acid
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It does, if the nitric acid is dilute. If the HNO3 is concentrated the gas produced is a mixture of oxides of nitrogen, because concentrated nitric acid is a powerful oxidizing agent and can oxidize free hydrogen to water.
It does, if the nitric acid is dilute. If the HNO3 is concentrated the gas produced is a mixture of oxides of nitrogen, because concentrated nitric acid is a powerful oxidizing agent and can oxidize free hydrogen to water.
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