Question # 1

The quantum number which describe the orientation of the orbitals is

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Spin quantum number

Principle quantum number

Azimathal quantum number

Magnetic quantum number

Charge on electron was discovered by:

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Millikan.

Crook.

Neil Bohr.

Rutherford.

The radius of second Bohr's orbit is

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0.053 nm

0.053/4 nm

0.053 x 4 nm

0.053 x 20 nm

Which of the following is not charged particle

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Proton

Electron

Neutron

Hydrogen nucleus

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

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3 and 5

3 and 7

3 and 9

2 and 5

Which of the following particles has longest wavelength, if they have same speed:

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Proton.

Neutron.

Electron.

Positron.

Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25

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3.0 BM

4.9 BM

5.9 BM

6.9 BM

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1. The wavelength of this light will be

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500 nm

500 m

200 nm

5 x 10⁷m

Rutherford's experiment led to the discovery of

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Nucleus

Electron

Proton

alpha particle

Quantum number values for 2p orbitals are

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n = 2, l = 1

n = 1, l = 2

n = 1, l = 0

n = 2, l = 0

The number of de-electrons retained in Fe²⁺(At.No. of Fe = 26) ions is

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3

4

5

6

For principle quantum number n=4, the total number of orbitals having l = 3 is

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3

7

5

9

In which of the following pairs, the numbers of electrons in the outermost shell are different?

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As,Sb

Ge,Sn

In,pt

Se,Te

The configuration 1s²2s²2p⁵3s¹shows

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Excited state of O₂

Excited state of neon

Excited state of fluorine

Ground state of fluorine atom

The quantum number which determines the shape of the orbital is

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principal

azimuthal

magnetic

spin

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s

p

d

f

The uncertainty principle was stated only

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De Brogilie

Heinsenberg

Einstein

Schrodinger

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

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Gas molecules collide with anode

Gas molecules are at high temperature

Gas molecules produce X-rays

Cathode rays remove electrons from gas molecules

The range of visible spectrum is

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300 - 600 nm

600 - 900 nm

400 - 750 nm

100 - 300 nm

For which of the following sets of quantum numbers and electron will have the highest energy?

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3,2,1,1/2

4,2,-1,1/2

4,1,0,-1/2

5,0,0,1/2

The limiting line of Blamer series in hydrogen spectrum lies in

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Visible regions

Ultraviolet region

Infrared region

x-rays region

For a 3P subshell the set of principle and azimuthal quantum number is

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n = 1 , l = 2

n = 3, l = 0

n = 3, l = 1

n = 1, l = 3

The experimental evidences for the existence of atomic nucleus comes from:

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Line spectrum of hydrogen.

Magnetic bonding of cathode rays.

Millikan oil drop experiment.

Scattering of alpha particles by thin metal foil.

The orbital in Rutherford's model is

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Spiral

Circular

Both

None

In the ground state, an element has 13 electrons in its M shell. The element is

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Copper

Chromium

Nickel

Iron

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

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Microwave > infrared > visible > ultraviolet

Visible > ultraviolet > microwave > infrared

Ultraviolet > visible > infrared > microwave

Infrared > microwave > ultraviolet > visible

What is the packet of energy called?

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Electron

Photon

Positron

Proton

Light emitted from a source has its wave length 500nm, then its wave number will be

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2 x 10⁶m^-1

2 x 10⁷m^-1

5 x 10⁸m^-1

5 x 10⁹m^-1

Quantum number value for 2p orbitals are:

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n=2 ,l=1

n=1 ,l=2

n= ,l=0

n=2 ,l=0

The orbitals having n + l = 5 are

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2p, 3d,3s

3p, 3d, 5s

3s, 4p, 4d

5s, 4p, 3d

Splitting of spectral lines when atoms are subjected to strong electric field is called:

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Zeeman effect.

Stark effect

Photoelectric effect.

Compton effect.

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