Question

When solid potassium cyanide is added in water then

• A. pH will increase
• B. pH will decrease
• C. pH will remain the same
• D. electrical conductivity will not change

Answer 1

Answer: (A)

Potassium cyanide is the salt of strong base and weak acid, hence when it is added in water then pH will increase.
$KCN+\underset{\text{strong base}}{H_{2}OKOH}+\underset{\text{weak acid}}{\mathrm{HCN}}$