Question

Which substance is an electrolyte: O2,C3H8,Xe, or KNO3?

Answer 1

Answer: $KNO_3$

Explanation: Electrolyte is a substance which dissociates into ions when dissolved in water and thus is able to conduct electric current through them.

Compounds in solid form does not conduct electricity due to the absence of free ions.

$O_2$ is a gas and thus not an electrolyte.

$C_3H_8$ is a covalent compound and thus do not dissolve in water and thus is not an electrolyte.

$Xe$ is a noble gas and thus do not dissolve in water and thus is not an electrolyte.

$KNO_3$ is an ionic compound and thus dissolve in water and give ions which help to conduct electricity.

$KNO_3\rightarrow K^++NO_3^-$