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Question

If the aluminium salt of an anion X is Al2X3, what is the valency of X ? What will be the formula of the magnesium salt of X ?

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Solution

Valency of X in the aluminium salt Al2X3 can be worked out as follows (we know that valency of Al is 3):

ElementAlXValency32

Thus, it is clear that the valency of X is two.

Formula for the magnesium salt of X can be worked out as follows:
ElementMgXValency22
Crossing the valencies gives us the formula of the magnesium salt of X i.e. MgX.

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