### NEET Chemistry - New - Structure of Atom and Nuclear Chemistry

#### Question - 1

The angular momentum of electron in 'd' orbital is equal to:

• A $2\sqrt { 3 } \hbar$
• B $\hbar$
• C $\sqrt { 6 } \hbar$
• D $\sqrt { 2 } \hbar$

#### Question - 2

Calculate the energy in joule corresponding to light of wavelength 45 nm (Planck's constant, h= 6.63 x 10-34Js, speed of light, c= 3 x 108 ms-1.) :

• A 6.67 x 1015
• B 6.67 x 1011
• C 4.42 X 10-15
• D 4.42 x 10-18

#### Question - 3

The energy absorbed by each molecule (A2) of a substance is 4.4 x 10-19J and bond energy per molecule is 4.0 x 10-19J. The kinetic energy of the molecule per atom will be :

• A 2.0 x 10-20J
• B 2.2 x 10-19J
• C 2.0 x 10-19J
• D 4.0 x 10-20J

#### Question - 4

The value of Planck's constant is 6.63 x 10-34 Js. The velocity of light is 3.0 x 108 ms-1, Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 x 1015 S-1?

• A 4 x 101
• B 3 x 107
• C 2 x 10-25
• D 5 x 10-18

#### Question - 5

The energy of photon is given as : $\triangle$E/atom= 3.03 x 10-19J atom-1, then the wavelength ($\lambda$) of the photon is:

• A 6.56 nm
• B 65.6 nm
• C 656 nm
• D 0.656 nm

#### Question - 6

If uncertainty in position and momentum are equal, then uncertainty in velocity is :

• A $\frac { 1 }{ 2m } \sqrt { \frac { h }{ \pi } }$
• B $\sqrt { \frac { h }{ 2\pi } }$
• C $\frac { 1 }{ m } \sqrt { \frac { h }{ \pi } }$
• D $\sqrt { \frac { h }{ \pi } }$

#### Question - 7

Given, the mass of electron is 9.11 x 10-31kg, Planck's constant is 6.626x 10-34Js, the uncertainty involved in the measurement of velocity within a distance of 0.1Å is :

• A 5.79 x 106 ms-1
• B 5.79 x 107ms-1
• C 5.79 x 108 ms-1
• D 5.79 x 105 ms-1

#### Question - 8

The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given ionisation energy of H = 2.18 x 10-18J atom-1 and h = 6.625 x 10-34 Js):

• A 1.03 x 1015s-1
• B 2.00 x 1015s-1
• C 3.08 x 1015s-1
• D 1.54 x 1015s-1

#### Question - 9

In hydrogen atom, energy of first excited state is - 3.4 eV. Then, KE of same orbit of hydrogen atom is:

• A + 3.4 eV
• B + 6.8 eV
• C -13.6 eV
• D + 13.6 eV

#### Question - 10

Who modified Bohr's theory by introducing elliptical orbits for electron path?

• A Hund
• B Thomson
• C Rutherford
• D Sommerfeld