🔩 Metals and Non-Metals – Class 10 Science MCQs

Part 4: HOTS, Applications, Numericals & Real-life Questions (Q76–Q100)

Q76. Which metal is used in thermometers?

A. Sodium
B. Aluminium
C. Mercury
D. Zinc

✅ Correct Answer: C. Mercury

• A & D: Not used in thermometers.
• B: Aluminium conducts heat but not used in thermometers.
• C: Mercury expands uniformly with heat → ideal for thermometers.

Q77. Aluminium is used in food packaging because:

A. It is highly reactive
B. It forms a protective oxide layer
C. It is heavy
D. It is magnetic

✅ Correct Answer: B. It forms a protective oxide layer

Q78. Which metal is used in making aircrafts?

A. Copper
B. Zinc
C. Aluminium
D. Lead

✅ Correct Answer: C. Aluminium

• Lightweight and corrosion-resistant.

Q79. Which gas is evolved when zinc reacts with dilute sulphuric acid?

A. O₂
B. H₂
C. CO₂
D. SO₂

✅ Correct Answer: B. H₂

Q80. Which metal is used in electrical wiring?

A. Aluminium
B. Copper
C. Silver
D. Gold

✅ Correct Answer: B. Copper

• Silver is better but expensive, copper is affordable and good conductor.

Q81. Which is the most ductile metal?

A. Iron
B. Copper
C. Silver
D. Gold

✅ Correct Answer: D. Gold

Q82. The best method to prevent iron from rusting is:

A. Galvanization
B. Hammering
C. Cooling
D. Alloying with sodium

✅ Correct Answer: A. Galvanization

Q83. Which metal is used in galvanization?

A. Copper
B. Zinc
C. Aluminium
D. Lead

✅ Correct Answer: B. Zinc

Q84. Which of the following metals can be cut with a knife?

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

✅ Correct Answer: C. Sodium

• Alkali metals (Na, K) are soft.

Q85. Which non-metal is used in water purification?

A. Sulphur
B. Nitrogen
C. Chlorine
D. Iodine

✅ Correct Answer: C. Chlorine

Q86. Which of the following is amphoteric?

A. Na₂O
B. Al₂O₃
C. CuO
D. CO₂

✅ Correct Answer: B. Al₂O₃

Q87. Which non-metal is used in making antiseptics?

A. Iodine
B. Sulphur
C. Nitrogen
D. Phosphorus

✅ Correct Answer: A. Iodine

Q88. A metal ‘X’ is found in nature as sulphide ore. Which method is used to extract it?

A. Electrolysis
B. Calcination
C. Roasting
D. Refining

✅ Correct Answer: C. Roasting

• Sulphide ores are converted to oxides by roasting.

Q89. A carbonate ore on heating gives:

A. CO₂ + Metal oxide
B. CO + Metal
C. O₂ + Metal
D. SO₂ + Metal oxide

✅ Correct Answer: A. CO₂ + Metal oxide

Q90. Which metal is purified by electrolytic refining?

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

✅ Correct Answer: C. Copper

Q91. A brown deposit is observed when iron is dipped in CuSO₄ solution. The deposit is:

A. Fe
B. Cu
C. FeSO₄
D. CuO

✅ Correct Answer: B. Cu

• Displacement: Fe + CuSO₄ → FeSO₄ + Cu.

Q92. A student dropped a small piece of sodium into water. What will he observe?

A. It sinks without reaction
B. It burns with a pop sound
C. It floats, moves around and catches fire
D. No reaction

✅ Correct Answer: C. It floats, moves around and catches fire

Q93. Which of these metals is extracted by electrolysis?

A. Aluminium
B. Zinc
C. Iron
D. Copper

✅ Correct Answer: A. Aluminium

Q94. Which metal is used in thermite welding?

A. Aluminium
B. Copper
C. Magnesium
D. Iron

✅ Correct Answer: A. Aluminium

• Al reduces Fe₂O₃ → molten Fe, used to weld railway tracks.

Q95. Which metal is used in making filaments of electric bulbs?

A. Aluminium
B. Tungsten
C. Iron
D. Silver

✅ Correct Answer: B. Tungsten

• High melting point (~3400°C).

Q96. The amphoteric nature of Al₂O₃ means it reacts with:

A. Acids only
B. Bases only
C. Both acids and bases
D. Neither

✅ Correct Answer: C. Both acids and bases

Q97. Which non-metal is used in fertilizers?

A. Phosphorus
B. Nitrogen
C. Both A and B
D. Oxygen

✅ Correct Answer: C. Both A and B

Q98. What happens when carbon dioxide reacts with lime water?

A. It turns milky
B. It turns red
C. It turns blue
D. It turns colourless

✅ Correct Answer: A. It turns milky

• Due to CaCO₃ precipitation.

Q99. Which property makes aluminium useful for wrapping food items?

A. High reactivity
B. Corrosion resistance due to oxide coating
C. Brittle nature
D. Heaviness

✅ Correct Answer: B. Corrosion resistance due to oxide coating

Q100. Which is correct about noble metals like gold and platinum?

A. They are highly reactive
B. They corrode easily
C. They are least reactive
D. They react with dilute acids

✅ Correct Answer: C. They are least reactive

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