📘 Chapter 4 – The World of Metals and Non-metals

🔹 Part 4: Mixed Conceptual + Revision MCQs (Q76–Q100)

Q76. Which of these is a metal?

A) Carbon
B) Sulphur
C) Sodium
D) Iodine

✅ Answer: C) Sodium

Q77. Which of these is NOT a property of metals?

A) Malleable
B) Sonorous
C) Poor conductor
D) Ductile

✅ Answer: C) Poor conductor

Q78. Which of these metals is used in making foils?

A) Copper
B) Aluminium
C) Iron
D) Gold

✅ Answer: B) Aluminium

Q79. Which of these is brittle?

A) Sulphur
B) Copper
C) Aluminium
D) Iron

✅ Answer: A) Sulphur

Q80. The brown substance on iron after rusting is:

A) Iron oxide
B) Iron carbonate
C) Iron sulphide
D) Iron chloride

✅ Answer: A) Iron oxide (hydrated)

Q81. Which method prevents rusting?

A) Painting
B) Galvanisation
C) Oiling
D) All of these

✅ Answer: D) All of these

Q82. The black coating on silver ornaments is:

A) Silver sulphide
B) Silver oxide
C) Rust
D) Patina

✅ Answer: A) Silver sulphide

Q83. Which of these metals forms a green deposit when exposed to moist air?

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

✅ Answer: B) Copper

Q84. Which non-metal is used in water purification?

A) Nitrogen
B) Oxygen
C) Chlorine
D) Sulphur

✅ Answer: C) Chlorine

Q85. Which of these metals does NOT react with water?

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

✅ Answer: C) Copper

Q86. Which non-metal is used in making matchsticks?

A) Phosphorus
B) Sulphur
C) Carbon
D) Iodine

✅ Answer: A) Phosphorus

Q87. Which property makes metals useful in cooking utensils?

A) Ductility
B) Malleability
C) Conductivity
D) Sonority

✅ Answer: C) Conductivity

Q88. Which is the most ductile metal?

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

✅ Answer: C) Gold

Q89. Which gas is released when metals react with acids?

A) Oxygen
B) Nitrogen
C) Hydrogen
D) Carbon dioxide

✅ Answer: C) Hydrogen

Q90. Which metal is used in thermometers?

A) Zinc
B) Iron
C) Mercury
D) Aluminium

✅ Answer: C) Mercury

Q91. Which of these is an acidic oxide?

A) CO₂
B) MgO
C) CaO
D) Na₂O

✅ Answer: A) CO₂

Q92. Which of these is a basic oxide?

A) SO₂
B) CO₂
C) Na₂O
D) N₂O

✅ Answer: C) Na₂O

Q93. Which is a property of non-metals?

A) Sonorous
B) Brittle
C) Ductile
D) Lustrous

✅ Answer: B) Brittle

Q94. Which non-metal is found in all living things?

A) Oxygen
B) Sulphur
C) Carbon
D) Iodine

✅ Answer: C) Carbon

Q95. Which method protects iron by coating it with zinc?

A) Alloying
B) Galvanisation
C) Painting
D) Polishing

✅ Answer: B) Galvanisation

Q96. Which of these is the least reactive metal?

A) Gold
B) Iron
C) Aluminium
D) Copper

✅ Answer: A) Gold

Q97. Which of the following reacts vigorously with water?

A) Sodium
B) Copper
C) Aluminium
D) Iron

✅ Answer: A) Sodium

Q98. Which oxide dissolves in water to form an acid?

A) SO₂
B) Na₂O
C) MgO
D) CaO

✅ Answer: A) SO₂

Q99. Stainless steel is resistant to rusting because it contains:

A) Iron + carbon
B) Iron + chromium + nickel
C) Iron + zinc
D) Iron + sulphur

✅ Answer: B) Iron + chromium + nickel

Q100. Which statement is true about metals and non-metals?

A) Metals are poor conductors, non-metals are good conductors
B) Metals are ductile, non-metals are brittle
C) Metals are dull, non-metals are lustrous
D) Metals are always liquid, non-metals are always solid

✅ Answer: B) Metals are ductile, non-metals are brittle

Class 7 Science MCQs, CBSE Science Board Exams, NCERT Science Practice, Metals and Non-metals, Online Learning Science, CBSE Class 7 Science Chapter 4 MCQs, NCERT Class 7 Science metals and non-metals questions, Corrosion Class 7 Science multiple choice questions,
Properties of materials Class 7 Science MCQs, Online learning Class 7 Science exam practice