Question # 1

Charge on electron was discovered by:

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Millikan.

Crook.

Neil Bohr.

Rutherford.

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

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

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

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

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

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

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Greater.

same.

Smaller.

Not fixed.

An orbital can accommodate maximum two electrons with opposite spins according to

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Heisenberg's principle

Aufbau principle

Hund's srule

Pauli exclusion principle

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

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Na

O

Cl

N

Anode is the surface on which probability of finding electron is:

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50%

Less than 10%.

More than 95%.

Zero.

Which quantum number is sufficient to describe the electron is hydrogen atom?

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l

n

m

s

When 6d orbital is complete, the entering electron goes into:

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7f.

7s.

7p.

7d.

The electron in an atom

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moves randomly around the nucleus

has fixed space around the nucleus

is stationary in various energy levels

moves around its nucleus in definite energy levels

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

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 nature of positive rays depend on:

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Nature of discharge tube.

Nature of resident gas.

Nature of electrode.

All of above.

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

Which have better penetrating power

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Alpha rays

Beta rays

Gamma rays

X-rays

1 erg of energy corresponds to

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6.02 x 10²³J/mol

6.02 x 10¹⁶J/mol

1 erg/mol

10^-7J/mol

If the radius of first Bohr orbit be a_o, then the radius of third Bohr orbit would be

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3 x a_o

6 x a_o

9 x a_o

1/2 x a_o

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

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N

Li

P

Na

Effective magnetic moment of Sc³⁺ion is

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1.73

0

5.92

2.83

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

When 6s orbital is complete then next electron goes to

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6p

6d

5d

4f

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 arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

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5s

5p

5d

5f

The limiting line of Blamer series in hydrogen spectrum lies in

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Visible regions

Ultraviolet region

Infrared region

x-rays region

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

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2n

2n²

n²

n + 1

Neutrons was discovered by

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Mosely

Milliken

Chadwick

Ruherford

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

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Millikan.

J. Perrin.

Hittrof

J.J. Thomson.

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