1.

When a mixture of NH_(4)CI, NH_(4) OH and Na_(2) HPO_4was added to a solution containing Mg^(-2)a while precipitate (A) was formed When A was heated strongly reduce B was obtained A & B are .....

Answer»

`Mg(NH_4)PO_4`
`Mg_(2)P_2O_7`
`Mg_(3)(PO_4)_2`
MgO

Solution :`Mg^(2+)+NH_(4)^(+)+OH^(-)HPO_(4)^(2-)+5H_(2)O rarr Mgunderset("WHITE ppt")((NH_4)PO_(4).6H_(2)Odarr)`
`NH_4Cl` is added to prevent the precipitation of `Mg(OH)_2`


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