Question # 1

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

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

Rutherford's planetary like picture of the atomic modal was defective because

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It did not describe the quantity of positive charge

It did not explain the repulsion of protons within the nucleus

No empty space between nucleus and the electrons

Moving electron should radiate energy

e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

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Cathode rays are small sized particles

Cathode rays have same charge

Nature of cathode rays same for all gasses, but masses of nuclei are different for different gases

Temperature of cathode rays higher

Bohr model of atom is contradicted by:

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Planck's quantum theory

Pauli's exclusion theory

Heisenberg's uncertainty principle.

All of above.

The number of spherical nodes in 3p orbitals are

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One

Three

Non

Two

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

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Millikan.

J. Perrin.

Hittrof

J.J. Thomson.

The total number of orbitals in a shell with principal quantum number 'n' is

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2n

2n²

n²

n + 1

If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be

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1

4

9

12

Rutherford's atomic model suggests the existence of

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Atom

Nucleus

alpha particle

Measons

Which of the following was discovered first:

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Charge to mass ratio of electrons.

Mass of electrons.

Charge of electrons.

All of above at same time.

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

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Hund's rule

Heisenberg's principle

Paulit exclusion principle

Auf bau principle

Which one of the following statements is true about discovery of neutrons?

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These particles were formed by the bombardment of Alpha-particles on Beryllium.

These particles are formed by the spiting of alpha-particles.

These particles were discovered by natural radioactivity.

None of above.

The degenerate orbitals p-sub shell are

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2

3

5

7

Energy of electron in the infinite Bohr orbit of H-atom is

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0 KJ/mole

1 KJ/mole

-1 KJ/mole

-1313.32 KJ/mole

In the ground state of an atom, the electron is present:

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In the nucleus.

In the second shell.

Nearest to the nucleus.

farthest from the 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

E = hv is the

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Spectral equation

Plank's equation

de Broglie's equation

None of these

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

The size of electronic shell is described by

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Azimuthal Q. no

Magnetic Q.No

Spin Q. No

Principle Q. No

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

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Proton.

Neutron.

Electron.

Positron.

The orbitals having n + l = 5 are

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2p, 3d,3s

3p, 3d, 5s

3s, 4p, 4d

5s, 4p, 3d

Which one of the following particles has amass 1/1836 time, that of hydrogen?

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Neutron.

Proton.

Electron.

Positron.

Spectrum of white light is continuous becuase

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Colors separated by dark spaces

There are no boundary lines between the colours

The radiations are in infrared region

The radiatins fall in ultraviolet region

In the ground state of an atom, the electron is present

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In the nucleus

In the second shell

Nearest to the nucleus

Farthest from the nucleus

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

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

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12 and 4

16 and 5

16 and 4

12 and 5

Balmer's series is in ______ region

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Visible

U V

I. R.

None

The symbol of the element whose atoms have the outer most electronic configuration 2s²2p³is

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N

Li

P

Na

The e.m value for positive rays maximum for:

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Oxygen.

Nitrogen.

Helium.

Hydrogen.

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