Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 20

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Which of the following has the maximum number of unpaired electrons?

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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 21

The angular velocity of an electron occupying the second Bohr orbit of

{He}^{+}

ion is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 22

An excited state of

H

-atom emits a photon of wavelength

λ

and returns to the ground state, the principal quantum number of the excited state is given by which of the following?

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 23

Light of wavelength

λ

strikes a metal surface with intensity

X

and the metal emits

Y

electrons per second of average energy

Z .

What will happen to

Y

and

Z

if

X

is havled?

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 24

Neutron scattering experiments have shown that the radius of the nucleus of an atom is directly proportional to the cube root of the number of nucleons in the nucleus. From

{}_{3}^{7}{Li}

to

{}_{78}^{180}{Os}

, the radius is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 25

The nucleus of an atom is located at

x = y = z = 0 .

If the probability of finding an electron in

d_{x^{2} - y^{2}}

orbital in a tiny volume around

x = a, y = 0, z = 0

is

1 \times 10^{- 5},

what is the probabilility of finding the electron in the same size volume around

x = 0, y = a, z = 0

?

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 26

The energy of

I, II

and

III

energy levels of a certain atom are

E, \frac{4 E}{3}

and

2 E

, respectively. A photon of wavelength

λ

is emitted during the transition from

III

to

I

. What will be the wavelength of emission for the transition

II

to

I

?

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 27

A compound of vanadium has a magnetic moment of

1.73 BM .

What will be the electronic configurations of the same?

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 28

Calculate the minimum and maximum number of electrons which may have magnetic quantum number,

m = + 1

, and spin quantum number

s = - \frac{1}{2}

in chromium

(Cr)

: