Question 1
In the following pictures representing binary hydrides AH
x, lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element, A.

The binary hydride shown in picture (3) is classified as
◦ covalent.
◦ interstitial (metallic).
◦ ionic.
◦ None of these
Question 2
In the following pictures representing binary hydrides AH
x, lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element, A.

The binary hydride shown in picture (4) is classified as
◦ covalent.
◦ interstitial (metallic).
◦ ionic.
◦ None of these