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A compound in the hydrated state gives a...

A compound in the hydrated state gives an ionic oxide when heated strongly. Its aqueous solution does not give any precipitate with `H_(2)S`, however, it does give white ppt. with `AgNO_(3)` solution which is soluble in aqueous ammonia. The given compound contains a metal which resembles Li and an integral part of Grignard reagent. Identify the compound withh the equation of its oxide formation.

Text Solution

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The metal which is diagonally related to Li and forms an integral part of Grignard reagent is Mg. Besides Mg, the hydrated salt also contain `Cl^(-)` as it gives white ppt. of AgCl with `AgNO_(3)`. AgCl is soluble in `NH_(4)OH`. Thus, the given salt is MgO as follows:
`MgCl_(2).6H_(2)O overset("heat")to MgO + 2HCl + 5H_(2)O`
`MgCl_(2) + 2AgNO_(3) to 2AgC l + Mg(NO_(3))_(2)`
`AgCl + 2NH_(4)OH to [Ag(NH_(3))_(2)Cl^(-) + 2H_(2)O]`
`Mg + RX overset("ether") to underset("Gingard reagent")(RMgX)`
Ans: The compound is `MgCl_(2).6H_(2)O`
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