Asked in Premeth MDCAT 2025 LR-04 — Electromagnetism, Transition Elements 2025Moderate

Which of the following is not an interstitial compound?

Correct answer: D. V2O5

  • A. Cu-Zn
  • B. Cu-Zn-Sn
  • C. TiH1.73
  • D. V2O5

Explanation

V2O5 is not an interstitial compound. Interstitial compounds are those that do not have an exact composition as shown in V2O5. Interstitial compounds are formed when small atoms of H, C, B, or N get trapped inside the crystal lattice of metals/ enter the interstices of transition metals and impart useful features to them. These are non-stoichiometric compounds (their element ratio can't be represented by a ratio of well-defined numbers.) and are also sometimes termed interstitial alloys. An interstitial alloy is formed when one type of metal atoms are much smaller than the other type. V2O5 is a stoichiometric compound as shown by the formula i.e., one molecule of vanadium pentaoxide has 2 vanadium atoms and 5 oxygen atoms.

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About Electronic Structure of d-Block Elements

The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.

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