Allotropes of Carbon — Homi Bhabha Exam Chemistry MCQs with Solutions
Free Homi Bhabha Exam Chemistry Allotropes of Carbon MCQs with step-by-step solutions (8 questions). Part of Carbon & Its Compounds. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Allotropes of Carbon · medium · theory
Different physical forms of the same element, such as diamond and graphite, are called:
A. allotropes ✓ Correct
B. isotopes
C. compounds
D. isomers
Solution: Allotropes are different structural forms of the same element (both are pure carbon).
Q2 — Allotropes of Carbon · medium · theory
The hardest allotrope of carbon is:
A. diamond ✓ Correct
B. charcoal
C. graphite
D. coke
Solution: Diamond has a rigid 3-D network, making it the hardest known natural substance.
Q3 — Allotropes of Carbon · hard · theory
Which allotrope of carbon conducts electricity?
A. Diamond
B. Coke
C. Graphite ✓ Correct
D. Charcoal
Solution: Graphite has free electrons in its layered structure and conducts electricity, unlike diamond.
Q4 — Allotropes of Carbon · hard · theory
Graphite is used as a lubricant and in pencil leads because it is:
A. soft and slippery (layered structure) ✓ Correct
B. a good insulator
C. a gas
D. extremely hard
Solution: Graphite's layers slide over one another, making it soft, slippery and useful as a lubricant.
Q5 — Allotropes of Carbon · medium · theory
Diamond is used for cutting and drilling because it is:
A. very soft
B. slippery
C. extremely hard ✓ Correct
D. a good conductor
Solution: The hardness of diamond makes it ideal for cutting glass and drilling rocks.
Q6 — Allotropes of Carbon · hard · theory
The spherical (football-shaped) allotrope of carbon containing 60 carbon atoms is:
A. graphite
B. coke
C. Buckminsterfullerene (C₆₀) ✓ Correct
D. diamond
Solution: C₆₀, or Buckminsterfullerene, is a cage-like molecular allotrope of carbon.
Q7 — Allotropes of Carbon · medium · theory
Both diamond and graphite are made up of only the element:
A. carbon ✓ Correct
B. oxygen
C. silicon
D. sulphur
Solution: Despite their different properties, both are pure carbon.
Q8 — Allotropes of Carbon · hard · theory
In diamond, each carbon atom is bonded to ______ other carbon atoms, giving a rigid structure:
A. four ✓ Correct
B. three
C. two
D. six
Solution: Each carbon in diamond forms four strong covalent bonds in a tetrahedral arrangement.