Chapter 13, Problem 1SAQ

Which compound forms an electroIyte solution When dissolved in water?

a. $KBr$

b. $B{r}_2$

c. $C{H}_{3}OH$

d. $C_6{H}_{12}{O}_6$ (glucose)

Interpretation Introduction

Interpretation: Compound which gives electrolytic solution when dissolved in water, is to be identified.

Concept Introduction: Compound which are dissociated into its constituent ions are called electrolytes.

Compound which dissociates completely into its constituent ions forms an electrolytic solution when dissolved in water.

Answer to Problem 1SAQ

Correct answer: The compound $KBr$ forms an electrolyte solution when dissolved in water.

Therefore, option a is the correct answer.

Explanation of Solution

Reason for correct option:

The electrolytes are known to dissociate into their constituent ions and form electrolytic solutions, which conducts electricity. The potassium bromide, $\text{KBr}$ is a salt which dissolves completely in water in order to form cation, ${\text{K}}^{+}$ and anion ${\text{Br}}^{\text{-}}$.

Hence, option (a) is correct.

Reasons for incorrect options: Option (b) is incorrect because the molecule ${\text{Br}}_{\text{2}}$ does not dissociate in water. So, it is a wrong answer.

Option (c) is incorrect because ${\text{CH}}_{\text{3}}\text{OH}$ does not dissociate into its component ions in water. So, it is a wrong answer.

Option (d) is incorrect because glucose, ${\text{C}}_{\text{6}}{\text{H}}_{\text{6}}{\text{O}}_{\text{12}}$ is a simple sugar, which does not dissociates into water. So, it is a wrong answer.

Hence, options (b), (c) and (d) are incorrect.