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4

The orbitals with maximum number of possible orientation is:

A. s

B. d

C. f

D. p

Correct Answer :

C. f


Related Questions

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4

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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4

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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4

The number of unpaired electrons in fluorine atoms is/are

A. 4

B. 2

C. 1

D. 0

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4

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

A. 0.01 m

B. 2 nm

C. 0.1 nm

D. 15Å

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4

Electronic configuration of Cu+ is

A. [Ar]3d9

B. [Ar]3d10

C. [Ar]3d93s2

D. [Ar]3d74s14p1

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4

Wave number is defined as

A. 3λ

B. λ2nπ

C. h2π

D. 1λ

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4

The atomic structure of an atom of an element is Is 1s2, 2s22p6, 3s23p6. The element is

A. Cl-35

B. S-32

C. N-18

D. O-16

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4

Which of the following has the highest mass?

A. Neutron

B. Alpha particle

C. Electron

D. Deuterium

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4

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

A. 4(2l+1)

B. 2(2l+1)

C. 2n2

D. n3

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4

The wavelength of an electron moving with a velocity 5×105m sec-1 is (h=6.63 ×10-34 kg m2 sec-1) 

A. 11.6 × 10-5m

B. 11.6 × 10-9m-1

C. 14.6 × 10-5m

D. 1.46 × 10-9m

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4

The fundamental particle that has least mass is

A. meson

B. alpha-particle

C. electron

D. neutron

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4

The charge on an atom of A1327l is

A. +40

B. +27

C. +14

D. Zero

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4

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

A. 1

B. 6

C. 7

D. 2

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4

β rays are a stream of

A. He

B. electrons

C. positron

D. neutrons

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4

Charge on an electron was shown by

A. J. J. Thomson

B. Kirchoff

C. Ohm

D. M.Planck

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4

Charge on fundamental particle neutrino is

A. 0

B. +1

C. -1

D. None of these

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4

In the nucleus of C20a40 there are

A. 40 protons and 20 electrons

B. 20 protons and 40 electrons

C. 20 protons and 40 neutrons

D. 20 protons and 20 neutrons

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4

The velocity of a photon is

A. dependent on its wavelength

B. dependent on its source

C. equal to cube of its amplitude

D. independent of its wavelength

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4

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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4

Which elements is represented by the following electronic configuration?

A. Nitrogen

B. Oxygen

C. Fluorine

D. Neon

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4

The interrelationship between matter and energy was given by

A. Rutherford

B. Joule

C. de Broglie

D. Einstein

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4

The ion that is isoelectronic with CO is

A. CN-

B. O2+

C. O2-

D. N2+

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4

The number of neutrons in the deuterium atom is

A. 16

B. 3

C. 1

D. 0

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4

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

A. de Broglie relationship

B. Uncertainty principle

C. Planck's hypothesis

D. Hund's rule

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4

The number of neutrons present in K1939 are

A. 28

B. 39

C. 20

D. 19

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4

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

A. 19

B. 20

C. 16

D. 15

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4

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

A. 6×1012 sec-1

B. 6×1014 sec-1

C. 3×1014MHz

D. 4×106Hz

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4

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

A.














nlm
210

B.














nlm
211

C.














nlm
311

D.














nlm
300

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4

The angular momentum of the moving electron is equal to

A. nh

B. h22π

C. nhπ

D. nh2π

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4

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