Question

Which of the following are strong electrolytes?

• A. $H_{2}S{O}_4$
• B. $NaOH$
• C. $Urea$
• D. $benzene$

Answer 1

Answer: (A), (B)

The correct options are
A $H_{2}S{O}_4$
B $NaOH$

As $H_{2}S{O}_4$ is strong acid it is dissociates completely in water, same with NaOH which is strong base, so both are strong electrolytes.
Urea dissociates partially in water so it is a weak electrolyte.
Whereas benzene doesn’t dissociate at all so it is a non-electrolyte.