CBSE Class 12 Atoms Multiple Choice Questions with Answers. MCQ Questions Class 12 Atoms with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Atoms MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Atoms with Answers - Set - 1
Question 1:
The electron in hydrogen atom jumps from the 3rd orbit to second orbit. The wavelength X of the emitted radiations is
(a) (36/5R)
(b) (5/36)R
(c) (5/R)
(d) (R/6)
Correct Answer – (A)
Question 2 :
In Bohr’s model of the hydrogen atom, the ratio between the period of revolution of an electron in the orbit n = 1 to the period of revolution of electron in the orbit n = 2 is
(a) ½
(b) ¼
(c) 1/8
(d) 2
Correct Answer – (C)
Question 3 :
In an atom, the two electrons move round the nucleus in circular orbits of radii R and 4R. The ratio of the times taken by them to complete one revolution is
(a) 1/4
(b) 1/8
(c) 4
(d) 8
Correct Answer – (A)
Question 4 :
A hydrogen atom is in the p-state. For this, values of J are
(a) 5/2, 3/2, ½
(b) 3/2, ½
(c) –½, ½, 3/2
(d) –½, -3/2
Correct Answer – (B)
Question 5 :
The ionisation potential of hydrogen is 13.6 V. The energy of the atom in n = 2 state will be
(a) -10.2 eV
(b) -6.4eV
(c) – 3.4 eV
(d) – 4.4 eV
Correct Answer – (C)
MCQ Questions Class 12 Atoms with Answers
Question 6 :
According to Bohr’s theory, the radius of electron in an orbit described by the principal quantum number n and the atomic number Z is propotional to :
(a) Z²n²
(b) Z²/n²
(c) Z²/n
(d) n²/Z
Correct Answer – (D)
Question 7 :
The ratio of the energies of the hydrogen atom in its first to second excited state is :
(a) 1/4
(b) 4/9
(c) 9/4
(d) 4
Correct Answer – (C)
Question 8 :
In Rutherford’s scattering experiment with gold foil, 232 counts per minute are observed at an angle of 60°. The number of counts/min. at an angle of 120° will be
(A) 232
(b) 116
(c) 26
(d) 52
Correct Answer – (C)
Question 9 :
At the time of total solar eclipse, the spectrum of solar radiation would be
(a) a large number of dark Fraunhoffer lines
(b) a small number of dark Fraunhofer lines.
(c) All Fraunhofer lines changed into brilliant colours.
(d) None of these.
Correct Answer – (C)
Question 10 :
A spectral line is emitted when an electron
(a) jumps from lover orbit to higher orbit.
(b) jumps from higher orbit to lower orbit.
(c) rotates in a circular orbit.
(d) rotates in an elliptical orbit.
Correct Answer – (B)
- NCERT Solutions Class 11 Chemistry Chapter 1 : Some Basic Concepts of Chemistry
- NCERT Solutions Class 11 Chemistry Chapter 2 : Structure Of The Atom
- NCERT Solutions Class 11 Chemistry Chapter 3 : Classification of Elements and Periodicity in Properties
- NCERT Solutions Class 11 Chemistry Chapter 4 : Chemical Bonding and Molecular Structure
- NCERT Solutions Class 11 Chemistry Chapter 5 : States of Matter
- NCERT Solutions Class 11 Chemistry Chapter 6 : Thermodynamics
- NCERT Solutions Class 11 Chemistry Chapter 7 : Equilibrium
- NCERT Solutions Class 11 Chemistry Chapter 8 : Redox Reactions
- NCERT Solutions Class 11 Chemistry Chapter 9 : Hydrogen
- NCERT Solutions Class 11 Chemistry Chapter 10 : The s-Block Elements
- NCERT Solutions Class 11 Chemistry Chapter 11 : The p-Block Elements
- NCERT Solutions Class 11 Chemistry Chapter 12 : Organic Chemistry: Some Basic Principles and Techniques
- NCERT Solutions Class 11 Chemistry Chapter 13 : Hydrocarbons
- NCERT Solutions Class 11 Chemistry Chapter 14 : Environmental Chemistry
