The angular momentum of the moving electron is equal to

Question

The angular momentum of the moving electron is equal to

A. $\sqrt{n h}$

B. $\frac{h^{2}}{2 π}$

C. $\frac{n h}{π}$

D. $\frac{n h}{2 π}$

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Which of the following weighs the least?

A. 1 g of $C O_{2}$

B. 2 litres of $C O_{2}$ at N.T.P.

C. $3.01 \times 10^{11}$ molecules of $C O_{2}$

D. $3.01 \times 10^{22}$ atoms of carbon

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Frequency of the wave having wave number $20000 c m^{- 1}$ is

A. $6 \times 10^{12} s e c^{- 1}$

B. $6 \times 10^{14} s e c^{- 1}$

C. $3 \times 10^{14} M H z$

D. $4 \times 10^{6} H z$

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Which of the following atoms has a non-spherical outermost orbital.

A. H

B. Li

C. Be

D. B

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In the case of atomic spectrum of hydrogen which series of lines lie in the visible region?

A. Balmer

B. Paschen

C. Pfund

D. None of these

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In an atom of hydrogen, which of the following orbitais has the lowest energy for an electron present in it?

A. 3r

B. 2p

C. 4p

D. 2s

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Wave number is defined as

A. $\frac{3}{λ}$

B. $\frac{λ^{2}}{n π}$

C. $\frac{h}{2 π}$

D. $\frac{1}{λ}$

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The ion that is isoelectronic with CO is

A. $C N^{-}$

B. ${O_{2}}^{+}$

C. ${O_{2}}^{-}$

D. ${N_{2}}^{+}$

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When the electron is excited from K level to M level we get

A. $γ$ - rays

B. cathode rays

C. continuous spectra

D. absorption spectra

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Cathode rays contain a stream of

A. $n$

B. $r$

C. ${}_{+ 1}e^{0}$

D. ${}_{- 1}e^{0}$

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The maximum number of electrons that can be accommodated by an atom in g-sub-energy level are

A. 20

B. 25

C. 18

D. 12

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Which elements is represented by the following electronic configuration?

A. Nitrogen

B. Oxygen

C. Fluorine

D. Neon

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The wavelength of an electron

A. is equal to that of light

B. remains constant with velocity

C. decreases with an increasing velocity

D. increases with an decreasing velocity

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The correct set of quantum numbers for the impaired electron of fluorine atom is

A.

n	l	m
2	1	0

B.

n	l	m
2	1	1

C.

n	l	m
3	1	1

D.

n	l	m
3	0	0

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The orbitals with maximum number of possible orientation is:

A. s

B. d

C. f

D. p

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Davisson and Germer gave an experimental evidence for

A. wave nature of electron

B. particle nature of electron

C. particle nature of light

D. wave nature of light

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The number of neutrons present in ${}_{19}^{39}K$ are

A. 28

B. 39

C. 20

D. 19

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The interrelationship between matter and energy was given by

A. Rutherford

B. Joule

C. de Broglie

D. Einstein

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Electronic configuration of $C u^{+}$ is

A. $[A r] 3 d^{9}$

B. $[A r] 3 d^{10}$

C. $[A r] 3 d^{9} 3 s^{2}$

D. $[A r] 3 d^{7} 4 s^{1} 4 p^{1}$

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For a given energy level the number of orbitals is equal to

A. $n^{2}$

B. $2 l + 1$

C. $4 (2 l + 3)$

D. $\sqrt{2 n^{3}}$

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Among the following ions, which are has the highest paramagnetism?

A. $[C r (H_{2} O)_{6}]^{+ 3}$

B. $[F e (H_{2} O)_{6}]^{+ 2}$

C. $[C u (H_{2} O)_{6}]^{+ 2}$

D. $[Z n (H_{2} O)_{6}]^{+ 2}$

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The charge on an atom of ${}_{13}^{27}A l$ is

A. +40

B. +27

C. +14

D. Zero

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The number of neutrons in the deuterium atom is

A. 16

B. 3

C. 1

D. 0

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In Lyman series an electron jumps from higher energy level to

A. K energy level

B. M energy level

C. N energy level

D. L energy level

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The corect set of quantum numbers for the impaired electron of fluorine atom is

A.

n	l	m
2	1	0

B.

n	l	m
2	1	1

C.

n	l	m
3	1	1

D.

n	l	m
3	0	0

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Isotopes have different

A. arrangement of electrons

B. no. of P and e'

C. no. of neutrons

D. no. of electrons

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The exchange of particles considered responsible for keeping the nucleons together are

A. meson

B. electron

C. positron

D. neutron

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A dipositive ion $Z^{+ +}$ has $2 e^{-}$ in the K shell, 8 e~ s in the L shell and $8 e^{-}$ in the M shell. Atomic number of Z is

A. 19

B. 20

C. 16

D. 15

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The number of unpaired electrons in fluorine atoms is/are

A. 4

B. 2

C. 1

D. 0

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The angular momentum of the moving electron is equal to

A. $\sqrt{n h}$

B. $\frac{h^{2}}{2 π}$

C. $\frac{n h}{π}$

D. $\frac{n h}{2 π}$

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Mass of positron is the same to that of

A. proton

B. meson

C. electron

D. neutron

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Accepted Answer

D.

\frac{n h}{2 π}

The angular momentum of the moving electron is equal to

Correct Answer :

Show all Atomic Structure MCQ

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The angular momentum of the moving electron is equal to

Correct Answer :

Show all Atomic Structure MCQ

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Which of the following weighs the least?

Frequency of the wave having wave number 20000 cm-1 is

Which of the following atoms has a non-spherical outermost orbital.

In the case of atomic spectrum of hydrogen which series of lines lie in the visible region?

In an atom of hydrogen, which of the following orbitais has the lowest energy for an electron present in it?

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Davisson and Germer gave an experimental evidence for

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For a given energy level the number of orbitals is equal to

Among the following ions, which are has the highest paramagnetism?

The charge on an atom of A1327l is

The number of neutrons in the deuterium atom is

In Lyman series an electron jumps from higher energy level to

The corect set of quantum numbers for the impaired electron of fluorine atom is

Isotopes have different

The exchange of particles considered responsible for keeping the nucleons together are

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Also checkout

Frequency of the wave having wave number $20000 c m^{- 1}$ is

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A dipositive ion $Z^{+ +}$ has $2 e^{-}$ in the K shell, 8 e~ s in the L shell and $8 e^{-}$ in the M shell. Atomic number of Z is