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Q75 (NDA-I/2025) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Periodic table elements Answer Verified

Element X forms a chloride with the formula XCl2, which is a solid with high melting point. X would most likely be in the same group of periodic table as

Result
Your answer: —  ·  Correct: C
Explanation

The element X forms a chloride with the formula XCl2, indicating that X has a valency of +2 to balance two chlorine atoms (each with a valency of -1). Elements in Group 2 of the periodic table, known as alkaline earth metals, possess two valence electrons and typically form divalent cations (X²⁺). Magnesium (Mg) is a member of Group 2 and forms MgCl2, which is an ionic compound [1]. Ionic compounds are characterized by strong interparticle forces of attraction, resulting in high melting points [2]. For instance, the melting point of MgCl2 is approximately 714°C. In contrast, Sodium (Na) and Potassium (K) belong to Group 1 and form chlorides with the formula XCl (e.g., NaCl), while Aluminum (Al) belongs to Group 13 and typically forms AlCl3 [1]. Therefore, X is most likely in the same group as Magnesium [1].

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 3: Metals and Non-metals > QUESTIONS > p. 49
  2. [2] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 7: Particulate Nature of Matter > Activity 7.3 : Let us find out > p. 103
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