<span>The correct answer is option a. Compounds that do not dissociate show little to no conductivity.
The compounds that cannot dissociate into ions are not able to conduct electricity. Example- Carbonic acid is a weak electrolyte and sulphuric acid is a strong electrolyte. Carbonic acid dissociates very little in the solution and sulphuric acid dissociates very well. </span>
The mass spectrum of magnesium comes at 24 m /Z with less dense peak whereas the magnesium ion after loosing 2 charge produces intense peak due to achievement of noble gas configuration.