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IF valency of MG is '+2' and valency of ...

IF valency of MG is '+2' and valency of Sulphate `(SO_4)` is '-2', then the formula of compound formed by these

A

`Mg_2SO_4`

B

`Mg(SO_4)_2`

C

`MgSO_4`

D

`Mg_3(SO_4)_2`

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The correct Answer is:
A
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