The number of unpaired electrons in a chromic ion $C r^{+ 3}$ (atomic number 24) is

Question

The number of unpaired electrons in a chromic ion $C r^{+ 3}$ (atomic number 24) is

A. 6

B. 4

C. 3

D. 1

Correct Answer :

C. 3

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

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The velocity of a photon is

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The angular momentum of the moving electron is equal to

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

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

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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 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 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

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In Lyman series an electron jumps from higher energy level to

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Isotones have same

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

C. $2 n^{2}$

D. $n^{3}$

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

A. meson

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Mass of positron is the same to that of

A. proton

B. meson

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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

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Argon is isoelectronic with

B. $C l^{-}$

C. $B r^{-}$

D. $H^{+}$

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The interrelationship between matter and energy was given by

B. Joule

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

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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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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 a chromic ion $C r^{+ 3}$ (atomic number 24) is

A. 6

B. 4

C. 3

D. 1

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Charge on an electron was shown by

C. Ohm

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Charge on fundamental particle neutrino is

A. 0

B. +1

C. -1

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Which of the following weighs the least?

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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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$β$ rays are a stream of

A. He

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Answer 1

A.

[A r] 3 d^{9}

Answer 2

B.

[A r] 3 d^{10}

Answer 3

C.

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

Answer 4

D.

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

Answer 5

A. dependent on its wavelength

Answer 6

B. dependent on its source

Answer 7

C. equal to cube of its amplitude

Answer 8

D. independent of its wavelength

Answer 9

A.

\sqrt{n h}

Answer 10

B.

\frac{h^{2}}{2 π}

Answer 11

C.

\frac{n h}{π}

Answer 12

D.

\frac{n h}{2 π}

Answer 13

A.

11.6 \times 10^{- 5} m

Answer 14

B.

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

Answer 15

C.

14.6 \times 10^{- 5} m

Answer 16

D.

1.46 \times 10^{- 9} m

Answer 17

A. de Broglie relationship

Answer 18

B. Uncertainty principle

Answer 19

C. Planck's hypothesis

Answer 20

D. Hund's rule

Answer 21

B. Paschen

Answer 22

D. None of these

Answer 23

A. K energy level

Answer 24

B. M energy level

Answer 25

C. N energy level

Answer 26

D. L energy level

Answer 27

A. mass number

Answer 28

B. nuclear mass

Answer 29

C. no. of neutrons

Answer 30

D. no. of electrons

Answer 31

A.

4 (2 l + 1)

Answer 32

B.

2 (2 l + 1)

Answer 33

B. electron

Answer 34

C. positron

Answer 35

D. neutron

Answer 36

C. electron

Answer 37

D. neutron

Answer 38

A. wave nature of electron

Answer 39

B. particle nature of electron

Answer 40

C. particle nature of light

Answer 41

D. wave nature of light

Answer 42

A.

M g^{+ +}

Answer 43

A. Rutherford

Answer 44

C. de Broglie

Answer 45

D. Einstein

Answer 46

A. is equal to that of light

Answer 47

B. remains constant with velocity

Answer 48

C. decreases with an increasing velocity

Answer 49

D. increases with an decreasing velocity

Answer 50

C.

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

Answer 51

D.

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

Answer 52

A. Hund's rules

Answer 53

B. Flemming rule

Answer 54

C. Pauli's exclusion principle

Answer 55

D. Bohr theory

Answer 56

C.

4 (2 l + 3)

Answer 57

D.

\sqrt{2 n^{3}}

Answer 58

A. J. J. Thomson

Answer 59

B. Kirchoff

Answer 60

D. M.Planck

Answer 61

D. None of these

Answer 62

A. 1 g of

C O_{2}

Answer 63

B. 2 litres of

C O_{2}

at N.T.P.

Answer 64

C.

3.01 \times 10^{11}

molecules of

C O_{2}

Answer 65

D.

3.01 \times 10^{22}

atoms of carbon

Answer 66

B. electrons

Answer 67

C. positron

Answer 68

D. neutrons

The number of unpaired electrons in a chromic ion $C r^{+ 3}$ (atomic number 24) is

Correct Answer :

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The number of unpaired electrons in a chromic ion Cr+3 (atomic number 24) is

Correct Answer :

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

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