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Q81 (NDA-II/2010) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic chemical principles Answer Verified

As compared to covalent compounds, electrovalent compounds, generally have

Result
Your answer: —  Â·  Correct: D
Explanation

Electrovalent (ionic) compounds generally possess high melting and boiling points compared to covalent compounds. This difference arises from the nature of their chemical bonding. Ionic compounds consist of a rigid crystal lattice held together by strong electrostatic forces of attraction between oppositely charged ions [t1, t3, t5]. Breaking these strong ionic bonds requires a significant amount of thermal energy [t2, t4]. In contrast, covalent compounds (specifically discrete molecular ones) are held together by relatively weak intermolecular forces, such as van der Waals forces, which are easily overcome at lower temperatures [c1, c2, t3]. While the covalent bonds within a molecule are strong, the forces between molecules are weak, leading to lower melting and boiling points [c2, t2]. Consequently, ionic compounds are typically solids at room temperature with high thermal stability [t6, t7].

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > 4.1 BONDING IN CARBON – THE COVALENT BOND > p. 59
  2. [2] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > 4.1 BONDING IN CARBON – THE COVALENT BOND > p. 60
  3. [3] https://www.sciencedirect.com/topics/chemistry/ionic-bonding
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