Question

Which of the following equation is not correct?

• A. Amphoteric oxide / Hydroxide + Acid$\to$ Salt + Water
• B. Amphoteric oxide / Hydroxide + Alkali$\to$ Salt + Water
• C. Metal + Alkali$\to$ Salt + Water
• D. Metal + Alkali$\to$ Salt + Hydrogen

Answer 1

The correct option is C Metal + Alkali$\to$ Salt + Water

• Amphoteric oxide / Hydroxide on reaction with an acid forms a salt and water.

Example- ZnO + 2HCl → ZnCl₂ + H₂O.

Hence, option A represents the correct equation.

• Amphoteric oxide / Hydroxide on reaction with an Alkali forms a salt and water.

Example- BeO + 2NaOH → Na₂BeO₂ + H₂O.

Hence, option B also represents the correct equation.

• When a metal reacts with an alkali, salt and hydrogen gas is formed.

Example- Zn + 2NaOH → Na₂ZnO₂ + H₂ .

Hence, option C represents the incorrect equation and option D is the correct equation.