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

Question

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. $15 Å$

Correct Answer :

C. 0.1 nm

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$β$ rays are a stream of

A. He

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The interrelationship between matter and energy was given by

B. Joule

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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

Discuss this answer

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

A. 28

B. 39

C. 20

D. 19

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

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

Discuss this answer

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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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 wavelength of an electron

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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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The wavelength of an electron moving with a velocity $5 \times 10^{5} m s e c^{- 1} i s (h = 6.63 \times 10^{- 34} k g m^{2} s e c^{- 1})$

Discuss this answer

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

A. meson

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

C. $2 n^{2}$

D. $n^{3}$

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The fundamental particle that has least mass is

A. meson

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Which of the following weighs the least?

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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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Argon is isoelectronic with

B. $C l^{-}$

C. $B r^{-}$

D. $H^{+}$

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The number of unpaired electrons in the ground state of chromium is

A. 1

B. 6

C. 7

D. 2

Discuss this answer

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

Discuss this answer

The relationship between energy of a radiation and its frequency was given by

A. Planck

D. Joule

Discuss this answer

The number of neutrons in the deuterium atom is

A. 16

B. 3

C. 1

D. 0

Discuss this answer

The size of nucleus is

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The possible values of l for an s orbital are

A. -1, +1

B. 0 to 2

D. 0

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

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

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The angular momentum of the moving electron is equal to

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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

Discuss this answer

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

Discuss this answer

Answer 1

B. electrons

Answer 2

C. positron

Answer 3

D. neutrons

Answer 4

A. Rutherford

Answer 5

C. de Broglie

Answer 6

D. Einstein

Answer 7

A. 40 protons and 20 electrons

Answer 8

B. 20 protons and 40 electrons

Answer 9

C. 20 protons and 40 neutrons

Answer 10

D. 20 protons and 20 neutrons

Answer 11

A.

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

Answer 12

B.

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

Answer 13

C.

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

Answer 14

D.

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

Answer 15

B. Paschen

Answer 16

D. None of these

Answer 17

A. is equal to that of light

Answer 18

B. remains constant with velocity

Answer 19

C. decreases with an increasing velocity

Answer 20

D. increases with an decreasing velocity

Answer 21

A.

11.6 \times 10^{- 5} m

Answer 22

B.

11.6 \times 10^{- 9} m^{- 1}

Answer 23

C.

14.6 \times 10^{- 5} m

Answer 24

D.

1.46 \times 10^{- 9} m

Answer 25

B. electron

Answer 26

C. positron

Answer 27

D. neutron

Answer 28

A.

4 (2 l + 1)

Answer 29

B.

2 (2 l + 1)

Answer 30

B. alpha-particle

Answer 31

C. electron

Answer 32

D. neutron

Answer 33

A. 1 g of

C O_{2}

Answer 34

B. 2 litres of

C O_{2}

at N.T.P.

Answer 35

C.

3.01 \times 10^{11}

molecules of

C O_{2}

Answer 36

D.

3.01 \times 10^{22}

atoms of carbon

Answer 37

A. Hund's rules

Answer 38

B. Flemming rule

Answer 39

C. Pauli's exclusion principle

Answer 40

D. Bohr theory

Answer 41

A.

M g^{+ +}

Answer 42

A.

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

Answer 43

B.

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

Answer 44

C.

3 \times 10^{14} M H z

Answer 45

D.

4 \times 10^{6} H z

Answer 46

B. Rutherford

Answer 47

C. Einstein

Answer 48

A.

10^{- 12} m

Answer 49

B.

10^{- 8} m

Answer 50

C.

10^{- 15} m

Answer 51

D.

10^{- 10} m

Answer 52

C. -2 and + 1

Answer 53

A.

γ

- rays

Answer 54

B. cathode rays

Answer 55

C. continuous spectra

Answer 56

D. absorption spectra

Answer 57

A.

[A r] 3 d^{9}

Answer 58

B.

[A r] 3 d^{10}

Answer 59

C.

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

Answer 60

D.

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

Answer 61

A.

\sqrt{n h}

Answer 62

B.

\frac{h^{2}}{2 π}

Answer 63

C.

\frac{n h}{π}

Answer 64

D.

\frac{n h}{2 π}

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

Correct Answer :

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If value of h is taken as 10-34 kg m2 sec-1, the de-Broglie wavelength of a particle of mass 10-31 having velocity 109cm sec-1 is

Correct Answer :

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