Daily Practice Problems
NEET Chemistry
Structure of Atom
NEET Chemistry
Structure of Atom
Question 1.
If Rutherford had used gamma rays (γ-rays) instead of alpha particles (α-particles) in his gold foil experiment, which of the following observations would not have been made?
[Level: Easy]
(a) Gamma rays passing through the foil without any deflection.
(b) Gamma rays being significantly deflected by the nucleus of the atoms.
(c) Very few gamma rays getting absorbed by the foil.
(d) The scattering of gamma rays by the electrons in the gold atoms.
Question 2.
A 500-W radio transmitter operates at a frequency of 950 Hz. How many quanta per second does it emit?
[Level: Difficult]
(a) 8.03×1021
(b) 7.03×1029
(c) 5.93×1030
(d) 7.95×1029
Question 3.
An electron is confined to move freely inside a one-dimensional box of length 5 cm. What is the minimum uncertainty in its velocity?
[Level: Moderate]
(a) 2×10-3 m/s
(b) 1×10-3 m/s
(c) 1×10-4 m/s
(d) 5×10-4 m/s
Question 4.
The ratio of the e/m values of an electron to that of a proton?
[Level: Moderate]
(a) 1833:1
(b) 1:1833
(c) 2:1
(d) 1:2
Question 5.
Photoelectric emission is observed from a surface for frequencies v1
and v2
of incident radiations (
). If the maximum kinetic energy of photoelectrons in the two cases are in the ratio 3:1, then the threshold frequency v0 is given by:
[Level: Difficult]
Question 6.
Which of the following transitions in a hydrogen atom corresponds to the Balmer series?
[Level: Easy]
(a) n=5 to n=3
(b) n=3 to n=2
(c) n=4 to n=1
(d) n=3 to n=1
Question 7.
If the speed of the electron in the third Bohr orbit of a hydrogen atom is z, then the speed of the electron in the sixth Bohr orbit is:
[Level: Moderate]
Question 8.
The atomic number of manganese is 26. What will be the magnetic property of Fe3+ ?
[Level: Difficult]
(a) Diamagnetic
(b) Paramagnetic
(c) Ferromagnetic
(d) None of these
Question 9.
If the total energy of an electron in the 3rd shell of a hydrogen atom is −1.51 eV, then its potential energy in the 1st excited state would be:
[Level: Difficult]
(a) −3.02 eV
(b) +3.02 eV
(c) +1.51 eV
(d) −1.51 eV
Question 10.
Identify the incorrect set of quantum numbers.
[Level: Moderate]
(a) n=5, l=4, m=−4, s=+1/2
(b) n=3, l=2, m=1, s=−1/2
(c) n=4, l=3, m=3, s=+1/2
(d) n=3, l=1, m=2, s=+1/2
Question 11.
The total energy in the third orbit of the hydrogen atom is given by:
[Level: Difficult]
Question 12.
Which of the following statements is never true for cathode rays?
[Level: Easy]
(a) They possess kinetic energy
(b) They are electromagnetic waves
(c) They produce heat
(d) They produce mechanical pressure
Question 13.
Which of the following electronic configurations violates the Aufbau principle? [Level: Moderate]
(a) 1s² 2s² 2p⁶ 3s²
(b) 1s² 2s² 2p⁶ 3p¹
(c) 1s² 2s² 3s² 3p³
(d) 1s² 2s² 2p⁶ 3d¹
Question 14.
The electronic configuration of an element is 1s2 ,2s2 ,2p6 ,3s2 ,3p6 ,4s2 ,3d9 . This represents its:
[Level: Moderate]
(a) excited state
(b) ground state
(c) cationic form
(d) anionic form
Question 15.
The angular momentum of an electron in a circular orbit of radius r in a hydrogen atom is proportional to:
[Level: Easy]
(a) r
(b) r2
(c) 
(d) 1/r
Question 16.
The number of spherical nodes in 3p orbitals are:
[Level: Easy]
(a) none
(b) one
(c) two
(d) three
Question 17.
For a d-electron, the orbital angular momentum is:
[Level: Moderate]
Question 18.
Which of the following species has 4 lone pair of electrons?
[Level: Moderate]
(a) I
(b) O-
(c) Cl-
(d) He
Question 19.
Which pair of ions has an identical electronic configuration?
[Level: Moderate]
(a) Cr3+ , V3+
(b) Ni2+ , Fe2+
(c) Co2+,Fe3+
(d) Cu+ , Zn2+
Question 20.
Identify the orbital that has 1 angular node and 3 total nodes.
[Level: Moderate]
(a) 5d
(b) 5p
(c) 4p
(d) 3d
**********
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All About Daily Practice Problems on NEET Chemistry Structure of Atom NCERT Chapter 2
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