Question # 1

For a 3P subshell the set of principle and azimuthal quantum number is

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n = 1 , l = 2

n = 3, l = 0

n = 3, l = 1

n = 1, l = 3

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

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dxy

dxz

dz²

dx²- y²

Orbital having same energy is called:

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Hybrid orbital.

Valence orbital.

Degenerate orbital.

D-orbital.

In the ground state of an atom, the electron is present

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In the nucleus

In the second shell

Nearest to the nucleus

Farthest from the nucleus

Proton was discovered by:

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Chadwick

J.J. Rhomson

Millikan.

Goldstein.

The energy of ionization of an atom is the energy difference between orbital

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Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

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Hund's rule

Heisenberg's principle

Paulit exclusion principle

Auf bau principle

Which of the atoms has 1s², 2s², 2p_x²2p¹_y2p¹_zconfiguration

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Nitrogen

Carbon

Fluorine

Oxygen

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

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12 and 4

16 and 5

16 and 4

12 and 5

The principle quantum number describes

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The distance form the nucleus

The shape of the orbital

The orientation of the orbital

The spin of the electron

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

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Fourth Bohr orbit to the first Bohr orbit

Fifth Bohr orbit to the second Bohr orbit

Sixth Bohr orbit to the third Bohr orbit

Seventh Bohr orbit to the third Bohr orbit

Charge of an electron is:

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1.6 x 10^-19 C

9.1 x 10^-34 C

1.7588 x 10¹¹ C

6.62 x 10^-34 C

When electron jumps from n₂= 2,3,4,5,.... orbit to n₁= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines

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Lyman series

Blamer series

Paschen series

Brackett series

Which quantum number is sufficient to describe the electron is hydrogen atom?

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l

n

m

s

Rutherford's model of atom failed because:

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The atom did o have a nucleus and electrons

It did not account fro the attraction b/w protons and neutrons

It did no account for the stability of the atom.

There is actually no space b/w the nucleus ad the electrons.

Bohr model of atom is contradicted by:

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Planck's quantum theory

Pauli's exclusion theory

Heisenberg's uncertainty principle.

All of above.

The energy of the first electron is helium will be

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-13.6 eV

-54.4 eV

-5.44 eV

zero

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