Question

Aqueous solution of copper sulphate:

• A. Turns blue litmus red
• B. Turns red litmus blue
• C. Does not affect litmus
• D. Affects both red and blue litmus

Answer 1

Answer: (A)

Turns blue litmus red

When $Cu{SO}_4$ is dissolved in water, it forms $C{u}^{+2}$ and ${S{O}_4}^{2-}$. in this case, $H^{+}$ ions are generated, that is the reason why the solution is slightly acidic, thus, turning the blue litmus paper into red.