Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

Explanation

Nitric acid (`HNO_(3)`) is e strong oxidising 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 and itseiy HN03 gets reduced to `NO_(2)" or NO or "N_(2)O`. So, in the reaction of metais (except Mn and Mg), with dilute nitric acid, no hydrogen gas is evolved.