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NDA 1 2025 GAT, question 75

Topic: Chemistry

Q75

Element X forms a chloride with the formula XCl2XCl_{2}, which is a solid with high melting point. X would most likely be in the same group of periodic table as

  1. (a) Na
  2. (b) Al
  3. (c) MgCorrect answer
  4. (d) K

Solution.

Answer: (c) Mg

  1. Two chloride ions carry total charge −2, so X is most likely a metal forming a +2 ion.
  2. The high melting point supports an ionic solid.
  3. Magnesium is in Group 2 and forms MgCl2MgCl_{2}; sodium and potassium are Group 1, while aluminium commonly forms a +3 ion.