Carbon - Different Forms NDA Questions

NDA Chemistry

Carbon - Different Forms MCQ Questions


7.
In diamond, each carbon atom is bonded to how many other carbon atoms, forming a rigid three-dimensional structure?
A.
Six
B.
Three
C.
Four
D.
Two
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ANSWER :
C. Four
8.
Why is graphite a good conductor of electricity while diamond is not?
A.
Graphite has free ions while diamond does not
B.
Diamond has metallic bonding while graphite has covalent bonding
C.
Each carbon atom in graphite uses only 3 electrons for bonding, leaving one free electron for conduction
D.
Graphite has a higher density than diamond
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ANSWER :
C. Each carbon atom in graphite uses only 3 electrons for bonding, leaving one free electron for conduction
9.
Graphite is used as a lubricant and also as an electrode in dry cells because of its:
A.
High density
B.
White colour
C.
High melting point only
D.
Slippery, layered structure and electrical conductivity
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ANSWER :
D. Slippery, layered structure and electrical conductivity
10.
Buckminsterfullerene (C60) has a structure resembling which geometric shape?
A.
A hexagonal sheet
B.
A tetrahedron
C.
A football (soccer ball)
D.
A cube
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ANSWER :
C. A football (soccer ball)
11.
Which allotrope of carbon consists of a single layer of carbon atoms arranged in a honeycomb (hexagonal) lattice?
A.
Coke
B.
Graphene
C.
Charcoal
D.
Lampblack
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ANSWER :
B. Graphene
12.
Amorphous forms of carbon such as coal, coke, and charcoal are examples of:
A.
Compounds of carbon and hydrogen only
B.
Impure forms of carbon without a definite crystal structure
C.
Crystalline allotropes
D.
Ionic compounds of carbon
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ANSWER :
B. Impure forms of carbon without a definite crystal structure