Question

Which one of the following is a strong electrolyte?
(a)Sulphuric acid
(b)Acetic acid
(c)Carbonic acid
(d)Phosphoric acid

Answer 1

Hint: Strong electrolyte can be found using various methods or techniques. Here, we have to find the strong electrolyte in between sulphuric acid $\left( {{H_2}S{O_4}} \right)$, acetic acid $\left( {C{H_3}COOH} \right)$, carbonic acid $\left( {{H_2}C{O_3}} \right)$, phosphoric acid $\left( {{H_3}P{O_4}} \right)$. They all can be dissociated into cations and anions when immersed.

Complete answer:
Here sulphuric acid is the stronger electrolyte among the following four options. Electrolytes are substances which when dissolved in water get dissociated into cations (having positive charge) and anions (having negative charge). But there are two electrolytes present in nature and these are weak electrolytes and strong electrolytes. Weak electrolytes are those electrolytes which does not completely dissociates into cations and anions when dissolved in aqueous solution whereas the strong electrolytes are those electrolytes which gets dissociate completely and easily in comparison to weak electrolytes when dissolved in an aqueous solution. Some examples of weak electrolytes are: carbonic acid, phosphoric acid and acetic acid where on the other hand examples of strong electrolytes are hydrochloric acid, sulphuric acid, potassium hydroxide (also known as potash alum), etc.
And hence option A is the correct answer.

Note:
Strong electrolytes are good conductors of electric current in aqueous or molten state. A concentrated solution of a strong electrolyte has a lower vapor pressure when compared with pure water and at the same temperature. Some other examples of strong electrolytes are perchloric acid $\left( {HCl{O_4}} \right)$, hydriodic acid $\left( {HI} \right)$, nitric acid $\left( {HN{O_3}} \right)$ and many other examples are present there.