1.

Which gas is evolved by the treatment of magnesium with very dilute solution of HNO_(3)

Answer»

`N_(2)`
`NO_(2)`
`H_(2)`
`H_(2)O`

Solution :Magnesium and DILUTE `HNO_(3)` reacts to produce `H_(2)` gas this nitrate decomposes on heating to give `NO_(2)` and `O_(2)`
`Mg +underset("nitric acid")underset("Dilute")(2HNO_(3)) to Mg(NO_(3))_(2)+underset("Hydrogen")(H_(2)uarr)`
`2Mg(NO_(3))_(2) OVERSET(DELTA)to2MgO +4NO_(2)+O_(2)`


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