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Structure of Atom

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Q 1. The orbital diagram in which the Aufbau principle is violated is:

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Q 2. The correct set of quantum numbers for the unpaired electron of chlorine atom is:

{tex} n : 2,\ l : 1,\ m : 0{/tex}

{tex} n : 2, \ l : 1, \ m : 1 {/tex}

{tex} n : 3 , \ l : 1 , \ m : 1 {/tex}

{tex} n : 3 , \ l : 0 , \ m : 0 {/tex}

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Q 3. Which of the following does not characterise {tex} X {/tex}-rays?

The radiation can ionise gases

It causes ZnS to fluorescence

Deflected by electric and magnetic fields

Have wavelengths shorter than ultraviolet rays

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Q 4. A {tex} 3 p {/tex} orbital has:

two non spherical nodes

two spherical nodes

one spherical & one non spherical node

one spherical and two non spherical nodes

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Q 5. If the nitrogen atom has electronic configuration {tex} 1 s ^ { 7 } , {/tex} it would have energy lower than that of the normal ground state configuration {tex} 1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 3 } , {/tex} because the electrons would be closer to the nucleus. Yet {tex} 1 s ^ { 7 } {/tex} is not observed because it violates.

Heisenberg uncertainty principle

Hund's rule

Pauli exclusion principle

Bohr postulate of stationary orbits

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Q 6.

Beta-emission takes place

From the elements above the band of stability

When neutron is converted to proton

With shifting of the new element one group towards right

Following all the facts given above

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Q 7.

The angular momentum of an electron in 4s orbital, 3p orbital, and 4th orbit are

2K, 8L, 9M, and 2N

Structure is

Atomic number 21

The total number of

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Q 8.

Slow neutrons can bring about the fission of

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Q 9.

When passing through a magnetic field the largest deflection is experienced by

rays

All equal

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Q 10.

A radioactive element decays by the sequence, and with half-lives, given below

Which of the following statements about this system are correct?

After two hours, less than 10% of the initial

Maximum amount of

Atomic numbers of

All of the above are correct statements

Half-life period of

Total time

Thus, (a) is true

Before 30 min ( = half-life) amount of

Hence,

(since half-life of

Thus, (b) is correct

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Q 11.

3,7

4,8

3,8

4,7

So, atomic number=3, mass number=7

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Q 12.

When electronic transition occurs from higher energy state to lower energy state with energy difference equal to

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Q 13.

Which of the following nuclei is unstable?

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Q 14.

Thiosulphate ion,

Which is the correct statement?

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Q 15.

The electrons, identified by quantum numbers

Can be placed in the order of increasing energy, from the lowest to highest, as

According to Aufbau’s principle, filling of electrons in various subshells of an atom takes place in the increasing order of energy, starting with the lower most

The following order is observed:

According to Bohr-Bury rule,

| | | |

| 4 | 1 | 5 |

| 4 | 0 | 4 |

| 3 | 2 | 5 |

| 3 | 1 | 4 |

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Q 16.

After the emission of a

130

129

128

127

Neutron

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Q 17.

In the Schrodinger’s wave equation

Orbit

Wave function

Wave

Radial probability

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Q 18.

Which of the following has the maximum penetrating power?

Proton

Positron

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Q 19.

Which of the following projectiles is the best for bombarding the nuclide?

Proton

Deuteron

Neutron

Neutron is the best projectile

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Q 20.

Which of the following is false?

The energy of an electron in an orbital of a hydrogen-like species depends only on the principal quantum number

The angular momentum of an electron of an orbital of a multielectron atom depends on the quantum numbers

The expression of angular momentum of an electron in an orbital is given as

The

**True**

**False**. The angular momentum depends only on the azimuthal quantum number

**True**

**True**

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Q 21.

Which of the following elements belongs to

Pb-207

Bi-209

Pb-208

Pb-206

Pb-208 belongs to

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Q 22.

The radius of second Bohr’s orbit is

0.053 nm

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Q 23.

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

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

Photosensitivity of sodium

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Q 24.

When

Neutron

Positron

Isotope must have some number of proton, therefore

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Q 25.

The electronic configuration of a diapositive ion

32

42

30

34

Electronic configuration of

Since two

Hence, number of neutrons

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