Question

In the long form of periodic table, the \(d\)-block element which forms interstitial hydride is

• A. Mo
• B. W
• C. Ni
• D. Cr

Hint:

Interstitial hydrides are usually formed by transition metals. In these hydrides, hydrogen atoms occupy the interstitial spaces of the metal lattice rather than forming discrete ionic or covalent bonds.

Answer 1

The Correct Option is D

Step 1: Know what interstitial hydrides are.
Interstitial hydrides are formed by transition metals whose lattice absorbs H atoms into the gaps (interstices). They are non-stoichiometric. Typical metals: Ti, Zr, V, Cr, Ni, Pd.

Step 2: Identify from the options.
Among Mo, W, Ni, and Cr: Cr is a well-known d-block element that forms interstitial hydrides. Mo and W form hydrides only under extreme conditions (not typical interstitial type), while Ni and Cr are the classic examples. Among the given options, the answer is Cr. \[ oxed{Cr} \]