Element X forms a chloride with the formula XCl2, which is solid with a high melting point. X would most likely be in the same group of the Periodic Table as
A
Na
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B
Mg
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C
Al
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D
Si
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Solution
The correct option is B
Mg
Magnesium(Mg) has valency 2, when it combines with chlorine (valency 1) it forms MgCl2
Sodium (Na) has a valency of 1
Aluminum (Al) has valency 3
Silicon (Si) has valency 4
So the formula XCl2 match with Mg only Hence, option(b) is correct.