1.

Name the metal which reacts with a very dilute HNO_(3) to evolve hydrogen gas.

Answer»

Solution :(a) Magnesium and Manganese
(B) Formation loses twon ELECTRONS , and forms Magnesium ions to complete its octet.
`MG rarr Mf^(2+) +2^( e )`
oxygen GAINS that two electrons to becomes `o^(2-)`
`Mg^(2+) +O_(2) rarr MGO`


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