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12th Grade > Chemistry

ATOMIC STRUCTURE MCQs

Total Questions : 15 | Page 2 of 2 pages
Question 11. The shape of an orbital is given by the quantum number
  1.    n
  2.    I
  3.    m
  4.    s
 Discuss Question
Answer: Option B. -> I
:
B
The shape of an orbital is given by azimuthal quantum number 'l'
Question 12. Which of the following sets of quantum numbers is correct for an electron in 4f orbital?
  1.    n=4, 1=3, m=+1, s=+12
  2.    n=4, 1=4, m=−4, s=−12
  3.    n=4, 1=3, m=+4, s=+12
  4.    n=3, 1=2, m=−2, s=+12
 Discuss Question
Answer: Option A. -> n=4, 1=3, m=+1, s=+12
:
A
The possible quantum numbers for 4f electron are
n=4, l=3, m=-3, -2, -1, 0, 1, 2, 3 and s=±12
Question 13. The correct set of quantum numbers for the unpaired electron of chlorine atom (Z=17) is:
  1.    n = 2, l = 1, m = 0
  2.    n = 2, l = 1, m = 1
  3.    n = 3, l = 1, m = 1
  4.    n = 3, l = 0, m = 0
 Discuss Question
Answer: Option C. -> n = 3, l = 1, m = 1
:
C
atomic number of Cl=17 , electronic configuration = 1s22s22p63s23p5For 3p orbital n=3, l=1 m=-1,0,+1
Question 14. Which of the following pair is isodiapheres?
  1.    C146and Na2311
  2.    Mg2412and Na2311
  3.    He42and O168
  4.    C126and N157
 Discuss Question
Answer: Option C. -> He42and O168
:
C
Isodiaphers have same value of A – (2Z)
Question 15. Uncertainity in position of a hypothetical subatomic particle is 1Å and uncertainty in velocity is 3.34π × 105 m/s then the mass of the particle is approximately [h = 6.6 × 1034 Js]
  1.    2 × 10−28 kg
  2.    2 × 10−27 kg
  3.    2 × 10−29 kg
  4.    2 × 10−26 kg
 Discuss Question
Answer: Option C. -> 2 × 10−29 kg
:
C
Δx×m×Δvh4π
1×1010×m×3.34π×1056.6×10344×π
M=2×1029kg

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