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

Question

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

Correct Answer :

B. 2p

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Which of the following weighs the least?

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The maximum number of electrons in a sub-energy level is equal to

C. $2 n^{2}$

D. $n^{3}$

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If value of h is taken as $10^{- 34} k g m^{2} s e c^{- 1}$ , the de-Broglie wavelength of a particle of mass $10^{- 31}$ having velocity $10^{9} c m s e c^{- 1}$ is

A. 0.01 m

B. 2 nm

C. 0.1 nm

D. $15 Å$

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Which of the following has the highest mass?

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

A. Balmer

C. Pfund

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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 atomic number of an element having the valence shell electronic configuration $4 s^{2} 4 p^{6}$ is

A. 35

B. 26

C. 23

D. 34

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The wavelength of an electron

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Cathode rays contain a stream of

A. $n$

B. $r$

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

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In the nucleus of ${}_{20}C a^{40}$ there are

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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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No two electrons in an atom can have the same values of all four quantum numbers according to

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

A. $n^{2}$

B. $2 l + 1$

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

A. meson

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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 number of neutrons in the deuterium atom is

A. 16

B. 3

C. 1

D. 0

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Argon is isoelectronic with

B. $C l^{-}$

C. $B r^{-}$

D. $H^{+}$

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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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In Lyman series an electron jumps from higher energy level to

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$β$ rays are a stream of

A. He

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The ion that is isoelectronic with CO is

A. $C N^{-}$

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Which elements is represented by the following electronic configuration?

B. Oxygen

D. Neon

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The atomic structure of an atom of an element is Is $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}$ . The element is

A. Cl-35

B. S-32

C. N-18

D. O-16

Discuss this answer

Bohr's concept of the orbit in an atom was contradicted by

Discuss this answer

Charge on an electron was shown by

C. Ohm

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

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The angular momentum of the moving electron is equal to

Discuss this answer

Answer 1

A. 1 g of

C O_{2}

Answer 2

B. 2 litres of

C O_{2}

at N.T.P.

Answer 3

C.

3.01 \times 10^{11}

molecules of

C O_{2}

Answer 4

D.

3.01 \times 10^{22}

atoms of carbon

Answer 5

A.

4 (2 l + 1)

Answer 6

B.

2 (2 l + 1)

Answer 7

A. Neutron

Answer 8

B. Alpha particle

Answer 9

C. Electron

Answer 10

D. Deuterium

Answer 11

B. Paschen

Answer 12

D. None of these

Answer 13

A. is equal to that of light

Answer 14

B. remains constant with velocity

Answer 15

C. decreases with an increasing velocity

Answer 16

D. increases with an decreasing velocity

Answer 17

C.

{}_{+ 1}e^{0}

Answer 18

D.

{}_{- 1}e^{0}

Answer 19

A.

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

Answer 20

B.

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

Answer 21

C.

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

Answer 22

D.

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

Answer 23

A. 40 protons and 20 electrons

Answer 24

B. 20 protons and 40 electrons

Answer 25

C. 20 protons and 40 neutrons

Answer 26

D. 20 protons and 20 neutrons

Answer 27

A. Hund's rules

Answer 28

B. Flemming rule

Answer 29

C. Pauli's exclusion principle

Answer 30

D. Bohr theory

Answer 31

C.

4 (2 l + 3)

Answer 32

D.

\sqrt{2 n^{3}}

Answer 33

B. electron

Answer 34

C. positron

Answer 35

D. neutron

Answer 36

A.

M g^{+ +}

Answer 37

A. K energy level

Answer 38

B. M energy level

Answer 39

C. N energy level

Answer 40

D. L energy level

Answer 41

B. electrons

Answer 42

C. positron

Answer 43

D. neutrons

Answer 44

B.

{O_{2}}^{+}

Answer 45

C.

{O_{2}}^{-}

Answer 46

D.

{N_{2}}^{+}

Answer 47

A. Nitrogen

Answer 48

C. Fluorine

Answer 49

A. de Broglie relationship

Answer 50

B. Uncertainty principle

Answer 51

C. Planck's hypothesis

Answer 52

D. Hund's rule

Answer 53

A. J. J. Thomson

Answer 54

B. Kirchoff

Answer 55

D. M.Planck

Answer 56

A.

γ

- rays

Answer 57

B. cathode rays

Answer 58

C. continuous spectra

Answer 59

D. absorption spectra

Answer 60

A.

\sqrt{n h}

Answer 61

B.

\frac{h^{2}}{2 π}

Answer 62

C.

\frac{n h}{π}

Answer 63

D.

\frac{n h}{2 π}

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

Correct Answer :

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