Free MCQ for PMT.

Chemistry for PMT :
Atomic structure and chemical bonding:
1. Spin quantum numbers can have
A. Only one value.
B. Several values.
C. No value.
D. Two values viz +1/2 and -1/2.
2. 4s orbital gets filled before 3d because :
A. greater the value of n greater is the priority.
B. 4s has lower energy than 3d.
C. 4s can accomodate at the most 2 electrons.
D. None of these.
3. A new electron enters the orbital where :
A. (n+l) is maximum.
B. (n+l) is minimum.
C. (n+m) is maximum.
D. (n+m) is minimum.
4. The number of s electrons in Mg atom is:
A. 4
B. 2
C. 6
D. 8
5. Davison and Germer gave experimental evidence for :
A. Wave nature of electrons.
B. Particle nature of electrons.
C. Wave nature of light.
D. Particle nature of light.
6. If for g subshell, l=4, then it will show degeneracy of :
A. 5
B. 7
C. 9
D. 3
7. If elements with prinicipal quantum number n>4 were not allowed in nature, the number of possible elements will be :
A. 60
B. 32
C. 64
D. 84
8. Which one of the following is paramagnetic and has bond order 1/2 ?
A. H2
B. N2
C. F2
D. H2+
9. The number of unpaired electrons in O2 molecule is:
A. 0
B. 1
C. 2
D. 3
10. Metallic bond is :
A. Having delocalized electrons.
B. Non direction.
C. None
D. Both (A) and (B).
Answers :
1. D 2. B 3.B 4.C 5.B 6.C 7.A 8.D 9.C 10.D.

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