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MHT CET202523 Apr 2025Morning ShiftChemistryChemical Bonding and Molecular StructureActual

Which from following pair of compounds exhibits isomorphism?

Options

  1. ACalcite and aragonite
  2. B-quartz and cristobalite
  3. CSodium nitrate and calcium carbonate
  4. DDiamond and fullerene

Correct answer

C. Sodium nitrate and calcium carbonate

Step-by-step solution

Isomorphism occurs when substances share similar crystal structures and chemical compositions, enabling mixed crystal formation. Critical requirements include identical formula types, comparable ionic radii, and matching valencies among corresponding ions. Calcite and aragonite ( CaCO ₃ ) are polymorphs with identical composition but differing trigonal versus orthorhombic structures, precluding isomorphism. Similarly, -quartz and cristobalite ( SiO ₂ ) exhibit polymorphism with trigonal and cubic structures respect

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