Question

Which of the following will dissolve in water and give colour?

• A. ${\mathrm{Cu}}_2{\mathrm{Cl}}_2$
• B. ${\mathrm{CuCl}}_2$
• C. $\mathrm{AgBr}$
• D. ${\mathrm{ZnCl}}_2$

Answer 1

The correct option is B

${\mathrm{CuCl}}_2$

Explanation for the correct option:

Option (b):

• ${\mathrm{CuCl}}_2$on reaction with water gives the aqueous solution.
• It is completely soluble in water and gives pale-blue colour.
• So, ${\mathrm{CuCl}}_2$dissolves in water and give colour.

Explanation for the incorrect option:

Option (a): ${\mathrm{Cu}}_2{\mathrm{Cl}}_2$is only sparingly soluble in water.

Option (c): $\mathrm{AgBr}$ is insoluble in water.

Option (d): ${\mathrm{ZnCl}}_2$ gives a precipitate with water.

Final answer:

Hence, option (b) is the correct answer.