Assertion (A): A black body is an ideal body that emits and absorbs radiation of all frequencies.
Reason (R): The frequency of radiation emitted by a body goes from lower frequency to a higher frequency with an increase in temperature.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Planck's Theory |
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Assertion (A): It is impossible to determine the exact position and exact momentum of an electron simultaneously.
Reason (R): The path of an electron in an atom is clearly defined. 

1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  Heisenberg Uncertainty Principle |
 72%
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Assertion (A): All isotopes of a given element show the same type of chemical behaviour.
Reason (R): The chemical properties of an atom are controlled by the number of electrons in the atom.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Number of Electron, Proton & Neutron |
 64%
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Match the following.

Column I

Column II

A. Photon

1. Value is 4 for N-shell

B. Electron

2. Probability density

C. ψ2

3. Always positive value

D. Principle quantum number n

4. Exhibits both momentum and wavelength

Options:   A   B   C   D 
1.  4 4  2,3   1,3 
2.  1 2  3  4
3.  2,1  4  3  2,3
4.  4 5  3  2


 

 

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 87%
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Match the following:

Column I Column II
A. X-rays 1. v=100-104 Hz
B. Ultraviolet wave (UV) 2. v=1010 Hz
C. Long radio waves 3. v=1016 Hz
D. Microwave 4. v=1018 Hz
 
A B C D
1. 4 1 3 2
2. 1 4 2 3
3. 1 4 3 2
4. 4 3 1 2
Subtopic:  Electromagnetic Radiation |
 75%
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Match the quantum numbers with the information provided by them:

Quantum number Information provided
A. Principal quantum number 1. Orientation of the orbital
B. Azimuthal quantum number 2. Energy and size of orbital
C. Magnetic quantum number 3. Spin of electron
D. Spin quantum number 4. Shape of the orbital

Codes
 
A B C D
1. 2 4 1 3
2. 1 2 3 4
3. 1 4 3 2
4. 4 1 3 2
Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 90%
From NCERT
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Match the following species with their corresponding ground state electronic configuration.

Atom/Ion Electronic configuration
A. Cu 1. 1s22s22p63s23p63d10
B. Cu2+ 2. 1s22s22p63s23p63d104s2
C. Zn2+ 3. 1s22s22p63s23p63d104s1
D. Cr3+ 4. 1s22s22p63s23p63d9
5. 1s22s22p63s23p63d3
 
A B C D
1. 4 2 5 1
2. 3 4 1 5
3. 3 2 1 4
4. 4 2 1 3
Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
 87%
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Match the following rules with their statements.

Rules

Statements

A. Hund’s Rule

1. No two electrons in an atom can have the same set of four quantum numbers.

B. Aufbau Principle

2. In the ground state of atoms, orbitals are filled in the order of their increasing energies.

C. Pauli Exclusion Principle

3. Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital is singly occupied.

D. Heisenberg’s Uncertainty Principle

4. It is impossible to determine the exact position and exact momentum of a subatomic particle simultaneously.

 

 

Correct option is:

1) A-1,B-2,C-3,D-4

2) A-1,B-3,C-2,D-4

3) A-3,B-2,C-1,D-4

4) A-3,B-1,C-2,D-4

Subtopic:  Pauli's Exclusion Principle & Hund's Rule | AUFBAU Principle |
 81%
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Assertion (A): Bohr’s orbits are also called stationary states.
Reason (R): Electrons are stationary in an orbit.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Bohr's Theory |
 68%
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Assertion (A): Zn(ll) salts are diamagnetic.
Reason (R): Zn2+ ion has one unpaired electron.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

Subtopic:  Number of Electron, Proton & Neutron |
 74%
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