1.

Mg + "air" overset("Ignition") rarrA+ B (Insoluble ) A overset(dil.Hcl)rarrC+Duarr CuO+Doverset(Delta)rarrEuarr'E' can be prepared by heating .......

Answer»

`NH_(4) NO_3`
`HNO_3`
`(NH_4)_(2)Cr_(2)O_7`
`N_2O_4`

Solution :`5Mg+UNDERSET("air")(ubrace(N_2+O_2))overset(Delta)rarrunderset((A))(Mg_(3)N_(2))+underset("insoluble")underset(uarr(B))(MgOdarr)underset((A))(Mg_3N_2)+underset("dil)(6HCl)rarrunderset((C))(3MgCl_2)+underset((D))(2NH_3)uarr3CuO+underset((D))(2NH_3)rarr3Cu+underset((E))(N_2)uarr+3H_2O`
Mg + air `rarr MgO+Mg_(3)N_(2),Mg_(3)N_(2)+6H_(2)Orarr3Mg(OH)_2+2NH_(3)uarr`
`3CuO +2NH_(3)overset(Delta)rarr3Cu+3H_(2)O+N_(2(E))uarrCr_(2)O_(7)overset(Delta)rarrN_(2)(E)uarr+Cr_(2)O_(3)+4H_(2)O`


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