Chapter Exam

Chapter 3: Metals and Non-Metals — Online MCQ Test

Q: Which of the following is a characteristic physical property of metals?

Answer: B. Malleable and ductile — Metals are generally malleable (can be beaten into sheets) and ductile (can be drawn into wires), which are key physical properties.

Q: Which metal is in liquid state at room temperature?

Answer: B. Mercury — Mercury is a unique metal that exists as a liquid at room temperature, making it an important exception to the general rule.

Q: Non-metals are generally __________ conductors of heat and electricity.

Answer: C. poor — Non-metals, as a general rule, are poor conductors of heat and electricity, unlike metals which are excellent conductors.

Q: Which of the following is NOT a physical property of metals?

Answer: C. Brittle — Metals are not brittle; they are malleable and ductile. Brittleness is a characteristic of non-metals.

Q: Which of the following oxides is amphoteric?

Answer: C. Al₂O₃ — Aluminum oxide (Al₂O₃) shows both acidic and basic properties, making it an amphoteric oxide.

Q: A metal reacts with a dilute acid to produce a salt and:

Answer: B. Hydrogen gas — When metals react with dilute acids, they displace hydrogen from the acid, producing hydrogen gas: Metal + Acid → Salt + H₂

Q: Which of the following is NOT a method to prevent corrosion?

Answer: C. Heating in oxygen — Heating in oxygen would accelerate corrosion, not prevent it. Painting, galvanizing, oiling, and greasing are actual corrosion prevention methods.

Q: Consider the reactivity series: K > Na > Ca > Mg > Al > Zn > Fe > Pb > H > Cu > Ag > Au. Which of the following displacement reactions would NOT occur?

Answer: C. Cu + FeSO₄ → CuSO₄ + Fe — Copper is less reactive than iron, so it cannot displace iron from its salt solution. The reaction would not occur.

SCIENCE · CLASS 10th · Karnataka State Board

Practice Chapter 3: Metals and Non-Metals with a free chapter-wise online MCQ test for Karnataka State Board CLASS 10th SCIENCE. This chapter covers: 1. Physical PropertiesMetals: Generally lustrous, malleable, ductile, sonorous, and good conductors of heat and electricity. Most are solids with high melting points.Non-Metals: Po.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 3: Metals and Non-Metals — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 10th SCIENCE — Chapter 3: Metals and Non-Metals, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is a characteristic physical property of metals?

A. Brittle and non-lustrous
B. Malleable and ductile ✓
C. Poor conductor of electricity
D. Exist only as gases at room temperature

Answer: B. Malleable and ductile
Metals are generally malleable (can be beaten into sheets) and ductile (can be drawn into wires), which are key physical properties.

Which metal is in liquid state at room temperature?

A. Sodium
B. Mercury ✓
C. Aluminum
D. Iron

Answer: B. Mercury
Mercury is a unique metal that exists as a liquid at room temperature, making it an important exception to the general rule.

Non-metals are generally __________ conductors of heat and electricity.

A. good
B. excellent
C. poor ✓
D. superior

Answer: C. poor
Non-metals, as a general rule, are poor conductors of heat and electricity, unlike metals which are excellent conductors.

Which of the following is NOT a physical property of metals?

A. Lustrous
B. Sonorous
C. Brittle ✓
D. Ductile

Answer: C. Brittle
Metals are not brittle; they are malleable and ductile. Brittleness is a characteristic of non-metals.

Which of the following oxides is amphoteric?

A. Na₂O
B. CaO
C. Al₂O₃ ✓
D. CO₂

Answer: C. Al₂O₃
Aluminum oxide (Al₂O₃) shows both acidic and basic properties, making it an amphoteric oxide.

A metal reacts with a dilute acid to produce a salt and:

A. Oxygen gas
B. Hydrogen gas ✓
C. Chlorine gas
D. Nitrogen gas

Answer: B. Hydrogen gas
When metals react with dilute acids, they displace hydrogen from the acid, producing hydrogen gas: Metal + Acid → Salt + H₂

Which of the following is NOT a method to prevent corrosion?

A. Painting
B. Galvanizing
C. Heating in oxygen ✓
D. Oiling and greasing

Answer: C. Heating in oxygen
Heating in oxygen would accelerate corrosion, not prevent it. Painting, galvanizing, oiling, and greasing are actual corrosion prevention methods.

Why can copper NOT displace hydrogen from dilute acids, but zinc can?

A. Copper is harder than zinc
B. Copper is above hydrogen in the reactivity series
C. Zinc is above hydrogen in the reactivity series, copper is below it ✓
D. Copper has a lower density than zinc

Answer: C. Zinc is above hydrogen in the reactivity series, copper is below it
In the reactivity series, zinc is positioned above hydrogen while copper is below it. Only metals above hydrogen can displace it from acids.

Consider the reactivity series: K > Na > Ca > Mg > Al > Zn > Fe > Pb > H > Cu > Ag > Au. Which of the following displacement reactions would NOT occur?

A. Mg + CuSO₄ → MgSO₄ + Cu
B. Fe + CuSO₄ → FeSO₄ + Cu
C. Cu + FeSO₄ → CuSO₄ + Fe ✓
D. Zn + FeSO₄ → ZnSO₄ + Fe

Answer: C. Cu + FeSO₄ → CuSO₄ + Fe
Copper is less reactive than iron, so it cannot displace iron from its salt solution. The reaction would not occur.

A student observes that metal X reacts violently with water at room temperature and metal Y does not react with dilute acids. Based on the reactivity series, which conclusion is most reliable?

A. Metal X is more reactive than metal Y
B. Metal Y must be gold
C. Both metals are above hydrogen in the reactivity series
D. Metal X is likely an alkali metal while metal Y is below hydrogen in the reactivity series ✓

Answer: D. Metal X is likely an alkali metal while metal Y is below hydrogen in the reactivity series
Metal X's violent reaction with water suggests it is a highly reactive metal (likely alkali metal). Metal Y's inertness to dilute acids indicates it is below hydrogen in the reactivity series, consistent with metals like copper, silver, or gold.

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