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Element X forms a chloride with the form...

Element X forms a chloride with the formula `XCl_(2)`, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as

A

Na

B

Mg

C

AI

D

Si

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The correct Answer is:
B
Explanation : Magnesium has the valency 2 and valency in a group remains the same. When it combines with chlorine having valency 1 it forms `MgCI_2`. Na has valency 1 `(NaCI)`, AI has valency 3 `(AICI_3)`, Si has valency 4 `(SiCI_4)`.
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