The P-Block Elements NDA Questions

NDA Chemistry

The P-Block Elements MCQ Questions


13.
In carbon, only s and p orbitals are available for bonding and, therefore, it can accommodate only _____ pairs of electrons around it.
A.
1
B.
2
C.
4
D.
3
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ANSWER :
C. 4
14.
Carbon atoms have the tendency to link with one another through covalent bonds to form chains and rings. This property is called
A.
Catenation
B.
Bonding
C.
Oxidation
D.
Reduction
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ANSWER :
A. Catenation
15.
What are the two well-known crystalline forms of carbon?
A.
Diamond
B.
Graphite
C.
Both a and b
D.
Lead
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ANSWER :
C. Both a and b
16.
Due to property of catenation and pĪ€â€“ pĪ€ bond formation, carbon is able to show _____ forms
A.
Allotropic
B.
Amphoteric
C.
Solubility
D.
Catalytic
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ANSWER :
A. Allotropic
17.
In 1985, third form of carbon known as _____ was discovered by H.W.Kroto, E.Smalley and R.F.Curl
A.
Bonding
B.
Lead
C.
Tin
D.
Fullerenes
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ANSWER :
D. Fullerenes
18.
What is the length of the C-C bond in diamond?
A.
189 pm
B.
154 pm
C.
25 pm
D.
109 pm
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ANSWER :
B. 154 pm