Solution:
Option (i) is the answer.
The elements in groups 7, 8, and 9 have a low affinity for hydrogen, as a result of which they have little potential to combine with hydrogen to create hydrides.
Elements of which of the following group(s) of periodic table do not form hydrides. (i) Groups 7, 8, 9 (ii) Group 13 (iii) Groups 15, 16, 17 (iv) Group 14