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Question

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


  1. Magnesium(Mg) has valency 2, when it combines with chlorine (valency 1) it forms MgCl2
  2. Sodium (Na) has a valency of 1
  3. Aluminum (Al) has valency 3
  4. Silicon (Si) has valency 4
  5. So the formula XCl2 match with Mg only
    Hence, option(b) is correct.

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