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An element fo...

Question

An element forms compounds of the formula $A C l_{3}, A_{2} O_{5}$ and $M g_{3} A_{2}$ but does not form $A C l_{5}$ . A could be:

A

Al

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B

P

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C

B

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D

N

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Solution

The correct option is C N
$A C l_{3}, A_{2} O_{5}, M g_{3} A_{2}$

Valency of A is 3. Its maximum oxidation state is +5.

It is a group V element with no d-orbitals (it can't form compounds of valency more than 4), so, it must be nitrogen.

Option D is correct.

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