Which of the following is the best conductor of electricity ?

Options

A. `1M H_(3)PO_(4)`
B. `1M H_(2)SO_(4)`
C. `1M H_(2)CO_(3)`
D. `1M HCI`

Answer

B

Explanation

Carbonic acid `(H_(2)CO_(3))` and phosphoric acid `(H_(3)PO_(4))` are weak acids and, hence, weak electrolytes while hydrochloric acid (HCI) and sulphuric acid `(H_(2)SO_(4))` are strong acids and, hence, strong electrolytes. Strong electrolytes conduct electrity well in dilute aqueous solution while weak electrolytes conduct electricity poorly in dilute aqueous solultion. `1 M H_(2)SO_(4)` produces 3 mol of ions `(2H^(+)` and `SO_(4)^(2-))` while `1M HCI` gives 2 mol of ions `(1H^(+)` and `1CI^(-))`.