Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 30

HARD

11th CBSE

IMPORTANT

Earn 100

The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [ $a_{0}$ is Bohr radius].

70% studentsanswered this correctly

Important Questions on Structure of Atom

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 31

The most probable radius (in

pm

) for finding the electron in

{He}^{+}

is

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 32

If

∆ E

is the energy emitted in electron volts when an electronic transition occurs from higher energy level to a lower energy level in

H

-atom, the wavelength of the line produced is approximately equal to

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 33

If

R_{H}

represents Rydberg constant, then the energy of the electron in the ground state of hydrogen atom is

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 34

Ionisation energy of

{He}^{+}

is

19 \cdot 6 x 10^{- 18} J {atom}^{- 1}

. The energy of the first stationary state

(n = 1)

of

{Li}^{2 +}

is

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 35

If an electron travels with a velocity of

1 / 100 th

speed of light in the first Bohr orbit, what is its velocity (relative to the speed of light) in the

5^{th}

Bohr orbit?

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 36

In the hydrogen atom, the electrons are excited to the

5^{th}

energy level. The number of lines that may appear in the spectrum will be

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 37

Which of the following is the energy of a possible excited state of hydrogen ?

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 38

Calculate the energy in joule corresponding to light of wavelength

45 nm

(Planck's constant,

h = 6 \cdot 63 \times 10^{- 34} Js,

speed of light

= 3 \times 10^{8} {ms}^{- 1}

).