Question # 1

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

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Millikan.

J. Perrin.

Hittrof

J.J. Thomson.

Rutherford's atomic model suggests the existence of

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Atom

Nucleus

alpha particle

Measons

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

Schrodinger wave equation describes electron completely because

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It describes a set of four quantum number

It describes the particle nature of electron

It measures wavelength of electron

It describes electron moving in specific orbit

The electronic configuration of an atom/ion can be defined by the following

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Aufbau principle

Pauli's exclusion principle

Hund's Rule

All the above

The radius of first orbit of hydrogen atom

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0.329 A°

0.429 A°

0.529 A°

0.229 A°

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

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

Mass of simple electron is:

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9.1 x 10^-31 kg

9.1 x 10^-30 kg

1.66 x 10^-31 kg

9.1 x 10^-31 kg

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

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Fourth Bohr orbit to the first Bohr orbit

Fifth Bohr orbit to the second Bohr orbit

Sixth Bohr orbit to the third Bohr orbit

Seventh Bohr orbit to the third Bohr orbit

Which is not true with respect to cathode rays?

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A stream of electrons

Charged particles

Move with speed as that of light

Can be deflected by magnetic fields

The degenerate orbitals p-sub shell are

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2

3

5

7

The maximum number of electrons in a subshell for which l = 3 is

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14

10

8

4

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

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Decreases

Increases

Remains constant

Decreases for low value of Z and increase for higher value of Z

Which of the atoms has 1s², 2s², 2p_x²2p¹_y2p¹_zconfiguration

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Nitrogen

Carbon

Fluorine

Oxygen

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

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Increases

Decreases

Reaming same

Orbits coincide

Number of neutrons in heavy hydrogen atom is

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0

1

2

3

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 de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

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6.63 x 10^-33m

6.63 x 10^-34m

6.63 x 10^-35m

6.65 x 10^-35m

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 orbitals having n + l = 5 are

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2p, 3d,3s

3p, 3d, 5s

3s, 4p, 4d

5s, 4p, 3d

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

When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as

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Balmer series

Lyman series

Pfund series

Brackett series

n + l value for 4f will

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2

5

7

9

The value of R (Rydberg's constant) is _______ m-1

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1.0974 x 107

1.0842 x 107

1.082 x 10-7

Both a and b

The energy of the first electron is helium will be

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-13.6 eV

-54.4 eV

-5.44 eV

zero

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

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low ionization energy of sodium

sublimation of metallic sodium to give yellow vapour

emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region

photosenitivity

The number of spherical nodes in 3p orbitals are

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One

Three

Non

Two

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

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Cathode rays travel in straight lines

Cathode rays are negatively charged

Cathode rays produce x-rays

Cathode rays are material particles having momentum

Rutherford's model of atom failed because:

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The atom did o have a nucleus and electrons

It did not account fro the attraction b/w protons and neutrons

It did no account for the stability of the atom.

There is actually no space b/w the nucleus ad the electrons.

The nature of positive ray depend on:

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The nature of electrode.

The nature of discharge tube.

The nature of residual gas.

All of above.

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