Question

Which two substances react to give salt and water only? Copper (II) oxide and ethanoic acid Magnesium and sulphuric acid Sodium oxide and water Zinc carbonate and hydrochloric acid

Answer 1

Answer:

CuO and Ethanoic acid

Explanation:

Metal Oxide plus Acid gives salt and water

Answer 2

The two substances that react to give salt and water only are Copper (II) oxide and ethanoic acid.

Explanation:

• Metal oxides are basic in nature. They react with acids to form salt and water.

• Copper (II) oxide is also a metal oxide. It is basic in nature. Therefore, it reacts with ethanoic acid to form Copper acetate and water.

        $\[CuO + 2C{H_3}COOH \to Cu{(C{H_3}OO)_2} + {H_2}O\]$

• Magnesium reacts with sulphuric acid to form magnesium sulphate and hydrogen gas.

        $\[Mg + {H_2}S{O_4} \to MgS{O_4} + {H_2}\]$

• Sodium oxide and water react to form sodium hydroxide.

        $\[N{a_2}O + {H_2}O \to 2NaOH\]$

• Zinc carbonate reacts with hydrochloric acid to give zinc chloride, water and carbon dioxide.

        $\[ZnC{O_3} + 2HCl \to ZnC{l_2} + {H_2}O + C{O_2}\]$