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name the metal which reacts with a very dilute HNO3 to evolve hydrogen gas?

Magnesium (Mg) and manganese (Mn) are the metals which react with very dilute HNO3 to evolve H2 gas. 

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MAGNESIUM OR ZINC

Zn + 4HNO3 GIVES RISE TO ZN(NO3)2 + 2H

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SORRY THAT WAS ONLY MAGNESIUM!

Mg + 2HNO3 GIVES RISE TO Mg(NO3)2 + H2

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