Question # 1

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

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

Energy of electron in an orbit according to Bohr theory is negative due to

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Repulsion of electrons in the same orb

At infinity energy is zero ad a traction towards nucleus decreases energy

Electron has negative charge

Product of positive nuclear charge and negative charge is negative

The charge over mass ratio of electron is:

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1.6 x 10^-1 C Kg^-1

9.1 x 10^-31 C Kg^-1

1.7588 x 10¹¹ C Kg^-1

6.62 x 10^-34 C Kg^-1

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 nature of positive rays depend on:

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Nature of discharge tube.

Nature of resident gas.

Nature of electrode.

All of above.

The energy of ionization of an atom is the energy difference between orbital

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The ratio of the ionization energy of H and Be³⁺is

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1 : 1

1 : 3

1 : 9

1 : 16

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.

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

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Stark effect

Zeeman effect

Compton effect

Photoelectric effect

The energy of the first electron is helium will be

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-13.6 eV

-54.4 eV

-5.44 eV

zero

E = hv is the

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Spectral equation

Plank's equation

de Broglie's equation

None of these

The radiations with wavelength shorter than violet light are called

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Ultraviolet

Infrared

Microwave

Radio frequency

Rutherford's experiment led to the discovery of

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Nucleus

Electron

Proton

alpha particle

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

The size of electronic shell is described by

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Azimuthal Q. no

Magnetic Q.No

Spin Q. No

Principle Q. No

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

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N

Li

P

Na

The degenerate orbitals p-sub shell are

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2

3

5

7

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 atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element?

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6

11

17

23

The valence orbital configuration of an element with atomic number 23 is

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3d⁵

3d³, 4s²

3d³, 4s¹, 4p¹

3d²,4s²,4p¹

Which of the following is not a property of cathode rays

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They can produce x-rays when they strike a heavy metal anode

They can cause reduction reaction

They produce fluorescence in rare earth and minerals

They comprise neutral particles

Neutrons was discovered by

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Mosely

Milliken

Chadwick

Ruherford

Alpha rays consist of:

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Neutrons.

Helium nucleus.

Protons.

Hydrogen nucleus.

The rules which describe the distribution of electron in atomic energy levels are Auf-ban principle, Pauli's exclusion principle. Hunds rule. The pauli exclusion principle refers to the

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Orientation of orbital in space

Fact that two electrons in the same orbital should have opposite spins

Energy of the orbital

Spin of the electron

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s

p

d

f

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

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.

n + l value for 4f will

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2

5

7

9

The value of charge on electron is

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1.602 x 10^-19coulombs

1.602 x 10^-18coulombs

1.602 x 10^-17coulombs

1.602 x 10^-16coulombs

Effective magnetic moment of Sc³⁺ion is

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1.73

0

5.92

2.83

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