Science Practice Quiz 29

Q1.What are the primary products formed when metals react with water?

A. Metal salt and oxygen gas B. Metal oxide and hydrogen gas C. Metal hydroxide and carbon dioxide D. Metal carbonate and water

Q2.Which of the following metals reacts violently with cold water, causing the evolved hydrogen to immediately catch fire?

A. Calcium B. Magnesium C. Sodium D. Aluminium

Q3.When calcium reacts with water, why does it start floating?

A. It becomes lighter than water due to the reaction. B. The heat evolved makes it buoyant. C. Bubbles of hydrogen gas stick to its surface. D. It forms a soluble compound that dissolves in water.

Q4.Which of the following metals reacts with steam, but not with cold or hot water, to produce metal oxide and hydrogen?

A. Sodium B. Calcium C. Iron D. Copper

Q5.Which of the following metals does not react with water at all?

A. Magnesium B. Zinc C. Lead D. Potassium

Q6.What are the products formed when metals react with acids?

A. Metal oxide and water B. Salt and oxygen gas C. Salt and hydrogen gas D. Metal hydroxide and carbon dioxide

Q7.What are the typical products formed when a metal reacts with a dilute acid?

A. Salt + Oxygen B. Salt + Carbon dioxide C. Salt + Hydrogen D. Oxide + Water

Q8.Which two metals are explicitly mentioned as reacting vigorously even with cold water, requiring caution during experiments?

A. Magnesium and Aluminium B. Zinc and Iron C. Sodium and Potassium D. Copper and Silver

Q9.Why is hydrogen gas generally not evolved when a metal reacts with nitric acid (HNO3)?

A. HNO3 is a weak acid B. HNO3 is a strong reducing agent C. HNO3 is a strong oxidising agent D. HNO3 forms insoluble salts

Q10.Which two metals are exceptions and react with very dilute HNO3 to evolve hydrogen gas?

A. Copper and Iron B. Zinc and Aluminium C. Magnesium and Manganese D. Sodium and Potassium

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Science Practice Quiz 29