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Magnesium on heating in air gives (A) an...

Magnesium on heating in air gives `(A)` and `(B)`. On reaciton with water `(B)` gives a colourless gas `(C ).(C )` when passed through `CuSO_(4)` solution, gives a blue coloured solution `(D)`. Identify `(A),(B),(C )` and `(D)`.

Text Solution

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Magnesium, `Mg` reacts with `O_(2)` and `n_(2)` present in the air to give
`Mg+underset((air))(O_(2))overset(Delta)(rarr)MgO`
`Mg+underset((air))(N_(2))overset(Delta)(rarr)underset((B))(Mg_(3)N_(2)`
`MgO+H_(2)OrarrMg(OH)_(2)`
`Mg_(3)N_(2)+6H_(2)Orarr3Mg(OH)_(2)+2NH_(3)`
Since on hydrolysis, `Mg_(3)N_(2)` produces a colourless gas`NH_(3),(B)` is `Mg_(3)N_(2),(A)` is `MgO` and `(C )` is `NH_(3)`.
`4NH_(3)+CuSO_(4)+H_(2)Orarr[Cu(NH_(3))_(4)]SO_(4).H_(2)O`
(D) Blue coloured solution
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