Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 64

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The number of unpaired electrons in ${Ni}^{2 +}$ is

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Important Questions on Structure of Atom

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 65

The electronic level which allows the hydrogen atom to absorb, but not emit a photon is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 67

4 s

orbital has lesser energy than

3 d

orbital because it has_____.

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 68

The magnetic moment of a divalent ion of an element with atomic number

24

in an aqueous solution is

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 70

The set of quantum numbers that cannot be allotted to an electron in an atom is

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 71

If the energy of an electron in the

1^{st}

and

2^{nd}

energy levels of an

H

atom are

- 13.6 eV

and

- 3.4 eV

, respectively, the energy required in

eV

to excite an electron from the

1^{st}

to the

2^{nd}

energy level is

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 72

If

λ_{0}

and

λ

are the threshold wavelength and the wavelength of the incident light, respectively on a metal surface, the velocity of the photoelectron ejected from the metal surface is (

m_{e} =

mass of electron,

h =

Planck’s constant,

c =

speed of light)

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 73

The energy of an electron in the first Bohr orbit is

- 13.6 eV

. The energy of

{Be}^{3 +}

in the first excited state is

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 74

The de-Broglie wavelength of an object of mass

33 g

moving with a velocity of

200 {ms}^{- 1}

is of the order of: