why conc .hno3 is not needed to prepare h2s gas in blaboratory
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It is because nitric acid is a strong oxidising agent (because it decomposes to yield nascent oxygenas:2HNO3 →2NO2 + H2O + [O])and it oxidises the hydrogen formed to water.Only 1% dilute and cold nitric acid reacts with magnesium and manganese to liberate Hydrogen gas.
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