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Explanation: Mercury (Hg) is the only metal that exists as a liquid at room temperature.
2. Which non-metal is liquid at room temperature?
A. Carbon
B. Iodine
C. Bromine
D. Phosphorus
Answer: C. Bromine
Explanation: Bromine (Br) is a non-metal that exists in liquid state at room temperature.
3. Which non-metal is lustrous and shines brightly?
A. Sulphur
B. Oxygen
C. Iodine
D. Nitrogen
Answer: C. Iodine
Explanation: Iodine is a non-metal that possesses a metallic lustre.
4. The ability of metals to be drawn into thin wires is called:
A. Malleability
B. Ductility
C. Sonority
D. Conductivity
Answer: B. Ductility
Explanation: Ductility is the physical property of a material to be stretched into thin wires. Gold is the most ductile metal.
5. Which of the following metals is soft enough to be cut with a knife?
A. Iron
B. Copper
C. Sodium
D. Aluminium
Answer: C. Sodium
Explanation: Alkali metals like Sodium (Na), Potassium (K), and Lithium (Li) are so soft that they can easily be cut with a knife.
6. Which allotrope of carbon is the hardest naturally occurring substance?
A. Graphite
B. Diamond
C. Fullerene
D. Coal
Answer: B. Diamond
Explanation: Diamond, an allotrope of carbon, is the hardest naturally occurring substance known.
7. Which metal is the best conductor of heat and electricity?
A. Copper
B. Aluminium
C. Silver
D. Iron
Answer: C. Silver
Explanation: Silver (Ag) is the best conductor of heat and electricity, followed closely by copper.
8. Oxides that react with both acids as well as bases to produce salt and water are known as:
A. Acidic oxides
B. Basic oxides
C. Amphoteric oxides
D. Neutral oxides
Answer: C. Amphoteric oxides
Explanation: Oxides showing both acidic and basic behavior are called amphoteric oxides (e.g., Al₂O₃, ZnO).
9. Which of the following is an amphoteric oxide?
A. Na₂O
B. K₂O
C. Al₂O₃
D. MgO
Answer: C. Al₂O₃
Explanation: Aluminium oxide (Al₂O₃) and Zinc oxide (ZnO) are common amphoteric oxides.
10. Why are sodium and potassium stored under kerosene oil?
A. To prevent reaction with atmospheric oxygen and moisture
B. To increase their hardness
C. To keep them dissolved
D. To make them good conductors
Answer: A. To prevent reaction with atmospheric oxygen and moisture
Explanation: Sodium and potassium are highly reactive alkali metals that catch fire vigorously if exposed to air or water.
11. Which metal does NOT react even with steam or water at high temperatures?
A. Iron
B. Aluminium
C. Gold
D. Zinc
Answer: C. Gold
Explanation: Precious metals like gold, silver, platinum, and copper do not react with water or steam at all.
12. Aqua Regia is a freshly prepared mixture of concentrated HCl and concentrated HNO₃ in the ratio:
A. 1 : 3
B. 3 : 1
C. 2 : 3
D. 1 : 1
Answer: B. 3 : 1
Explanation: Aqua Regia contains concentrated hydrochloric acid and concentrated nitric acid in a 3:1 ratio.
13. Cinnabar is a major ore of which metal?
A. Copper
B. Mercury
C. Zinc
D. Iron
Answer: B. Mercury
Explanation: Cinnabar (HgS) is a sulfide ore of mercury.
14. Heating of carbonate ores strongly in limited supply of air to convert them into oxides is called:
A. Roasting
B. Calcination
C. Smelting
D. Refining
Answer: B. Calcination
Explanation: Calcination involves heating carbonate ores in limited air. Roasting involves heating sulfide ores in excess air.
15. Heating of sulfide ores strongly in the presence of excess air is called:
A. Calcination
B. Roasting
C. Reduction
D. Electrolysis
Answer: B. Roasting
Explanation: Sulfide ores are converted into metal oxides by heating strongly in the presence of excess air (Roasting).
16. The highly exothermic reaction of iron oxide with aluminium used to join railway tracks is known as:
A. Chlor-alkali process
B. Thermite reaction
C. Electrolytic refining
D. Solvay process
Answer: B. Thermite reaction
Explanation: Fe₂O₃ + 2Al → 2Fe + Al₂O₃ + Heat is the Thermite reaction, releasing molten iron to join tracks.
17. An alloy is a uniform mixture of:
A. Two or more metals or a metal and a non-metal
B. Only non-metals
C. Only ionic compounds
D. Gases with metals
Answer: A. Two or more metals or a metal and a non-metal
Explanation: An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal.
18. Amalgam is an alloy in which one of the component metals is always:
A. Copper
B. Mercury
C. Lead
D. Silver
Answer: B. Mercury
Explanation: If one of the constituent metals in an alloy is mercury, the alloy is called an amalgam.
19. Brass is an alloy consisting of which metals?
A. Copper and Tin
B. Copper and Zinc
C. Lead and Tin
D. Iron and Carbon
Answer: B. Copper and Zinc
Explanation: Brass is an alloy composed of Copper (Cu) and Zinc (Zn).
20. Bronze is an alloy composed of:
A. Copper and Zinc
B. Copper and Tin
C. Lead and Tin
D. Aluminium and Copper
Answer: B. Copper and Tin
Explanation: Bronze is an alloy made of Copper (Cu) and Tin (Sn).
21. Solder is an alloy of lead and tin. It has a low melting point and is used for:
A. Making utensils
B. Welding electrical wires together
C. Making jewelry
D. Construction of bridges
Answer: B. Welding electrical wires together
Explanation: Due to its low melting point, solder (Lead + Tin) is widely used for soldering/welding electrical components.
22. What green coating forms on copper when it is exposed to moist air for a long time?
A. Copper oxide
B. Copper sulfate
C. Basic copper carbonate
D. Copper nitrate
Answer: C. Basic copper carbonate
Explanation: Copper reacts with moist carbon dioxide in the air to form a green coating of basic copper carbonate [CuCO₃·Cu(OH)₂].
23. Galvanization is a process of protecting iron from rusting by coating it with a thin layer of:
A. Chromium
B. Zinc
C. Tin
D. Aluminium
Answer: B. Zinc
Explanation: Galvanization involves applying a protective zinc coating to iron or steel to prevent rusting.
24. During electrolytic refining of copper, the impure copper is made the:
A. Anode
B. Cathode
C. Electrolyte
D. Mud
Answer: A. Anode
Explanation: In electrolytic refining, impure metal acts as the anode, pure metal acts as the cathode, and metal salt solution acts as electrolyte.
25. Highly reactive metals like Na, Mg, and Ca are extracted from their molten salts by:
A. Reduction with carbon
B. Calcination
C. Electrolysis
D. Roasting
Answer: C. Electrolysis
Explanation: Highly reactive metals cannot be reduced by carbon because they have a stronger affinity for oxygen than carbon. Hence, electrolytic reduction is used.
26. What type of chemical bond is formed by the transfer of electrons from a metal to a non-metal?
A. Covalent bond
B. Ionic bond
C. Metallic bond
D. Hydrogen bond
Answer: B. Ionic bond
Explanation: Ionic (or electrovalent) compounds are formed by complete transfer of electrons from metals to non-metals.
27. Ionic compounds generally have high melting and boiling points because:
A. They contain covalent bonds
B. Strong electrostatic forces of attraction exist between oppositely charged ions
C. They are soft solids
D. They exist as liquids at room temperature
Answer: B. Strong electrostatic forces of attraction exist between oppositely charged ions
Explanation: Considerable energy is required to break the strong inter-ionic attractive forces in ionic lattices.
28. Which non-metal is a good conductor of electricity?
A. Diamond
B. Graphite
C. Sulfur
D. Phosphorus
Answer: B. Graphite
Explanation: Graphite has free electrons due to its hexagonal layer structure, making it a good electrical conductor.
29. Silver articles become black when exposed to air for a long time due to the formation of:
A. Silver oxide
B. Silver sulfide
C. Silver carbonate
D. Silver nitrate
Answer: B. Silver sulfide
Explanation: Silver reacts with hydrogen sulfide (H₂S) gas in air to form a black coating of Silver Sulfide (Ag₂S).
30. Stainless steel is produced by mixing iron with which elements?
A. Nickel and Chromium
B. Copper and Zinc
C. Lead and Tin
D. Aluminium and Magnesium
Answer: A. Nickel and Chromium
Explanation: Stainless steel is an alloy of iron, nickel, chromium, and a small percentage of carbon, making it rust-resistant.
This page contains a chapter-wise objective practice set. Try the questions without checking the answer first, then use the explanation to understand the point you missed. The current page contains 30 questions, so you can practise in smaller sets when you are revising.
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