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CBSE

Subject

Chemistry

NEET Chemistry : Structure of Atom

Multiple Choice Questions

91.

In Bohr's Orbit, $\frac{nh}{2 π}$ indicates

Momentum
Kinetic energy
Potential energy
Angular momentum

92.

When ${}_{13}^{27}{Al}$ is bombarded with $α$ - particle , a radioactive isotope of phosphorus ${}_{15}^{30}P$ is formed .Which particle is emitted along with ${}_{15}^{30}P$ ?

Deuteron
Proton
Electron
Neutron

93.

Which of the following is wrong for Bohr model?

It establishes stability of atom
It is inconsistent with Heisenberg uncertainty principle.
It explains the concept of spectral lines for hydrogen like species.
Electrons behave as particle and wave

94.

Assertion : Bohr model fails in case of multielectron pecies.

Reason : It does not mention electron-electron interactions.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

95.

An element with atomic number 84 and mass number 218 loses one a-particle and two $β$ -particles in three successive stages .The resulting element will have :

at. no. 84 and mass no. 214
at no. 82 and mass no. 214
at. no. 84 and mass no. 218
at. no. 82 and mass no. 218

96.

Smallest wavelength occurs for

Lyman series
Balmer series
Paschen series
Brackett series

97.

The valence shell electronic configuration of Cr²⁺ ion is :

4s⁰3d⁴
3p⁶4s²
4s³3d²
4s²3d⁰

98.

Assertion : Number of radial and angular nodes for 3p-orbital are 1, 1 respectively.

Reason : Number of radial and angular nodes depends only on principal quantum number.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

99.

A particle is moving 3 times faster than the speed of electron. If the ratio of wavelength of particle and electron is 1.8 x 10^-4 then particle is

neutron
$α$ - particle
deuteron
tritium

100.

The product formed is an isobar , if there is :

1 $α$ emission
1 $β$ emission
1 $α$ and 1 $β$ emission
2 $α$ and 2 $β$ emission

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