# Atomic Structure Test 6

Total Questions:50 Total Time: 60 Min

Remaining:

## Questions 1 of 50

Question:The nucleus of helium contains

Four protons

Four neutrons

Two neutrons and two protons

Four protons and two electrons

## Questions 2 of 50

Question:Which is correct statement about proton

Proton is nucleus of deuterium

Proton is ionized hydrogen molecule

Proton is ionized hydrogen atom

Proton is $$\alpha$$-particle

## Questions 3 of 50

Question:The average distance of an electron in an atom from its nucleus is of the order of

$${10^6}m$$

$${10^{ - 6}}m$$

$${10^{ - 10}}m$$

$${10^{ - 15}}m$$

## Questions 4 of 50

Question:The mass of 1 mole of electrons is

$$9.1 \times {10^{ - 28}}g$$

$$1.008\,mg$$

$$0.55\,mg$$

$$9.1 \times {10^{ - 27}}g$$

## Questions 5 of 50

Question:The mass of an atom is constituted mainly by

Neutron and neutrino

Neutron and electron

Neutron and proton

Proton and electron

## Questions 6 of 50

Question:The atomic number of an element represents

Number of neutrons in the nucleus

Number of protons in the nucleus

Atomic weight of element

Valency of element

## Questions 7 of 50

Question:Number of electrons in $$- CON{H_2}$$ is

22

24

20

28

## Questions 8 of 50

Question:The atomic number of an element having the valency shell electronic configuration $$4{s^2}4{p^6}$$ is

35

36

37

38

## Questions 9 of 50

Question:Which of the following are isoelectronic species $$I = CH_3^ + ,\,II - N{H_2},\,III - NH_4^ + ,\,IV - N{H_3}$$

I, II, III

II, III, IV

I, II, IV

I and II

## Questions 10 of 50

Question:The charge on the atom containing 17 protons, 18 neutrons and 18 electrons is

$$+ 1$$

$$- 2$$

$$- 1$$

Zero

## Questions 11 of 50

Question:The charge of an electron is $$- 1.6 \times {10^{ - 19}}C.$$ The value of free charge on $$L{i^ + }$$ion will be

$$3.6 \times {10^{ - 19}}C$$

$$1 \times {10^{ - 19}}C$$

$$1.6 \times {10^{ - 19}}C$$

$$2.6 \times {10^{ - 19}}C$$

## Questions 12 of 50

Question:Number of neutrons in heavy hydrogen atom is

0

1

2

3

## Questions 13 of 50

Question:Which of the following is always a whole number

Atomic weight

Equivalent weight

Atomic number

## Questions 14 of 50

Question:Electron occupies the available orbital singly before pairing in any one orbital occurs, it is

Pauli's exclusion principle

Hund's Rule

Heisenberg's principle

Prout's hypothesis

## Questions 15 of 50

Question:The wavelength of a spectral line for an electronic transition is inversely related to

The number of electrons undergoing the transition

The nuclear charge of the atom

The difference in the energy of the energy levels involved in the transition

The velocity of the electron undergoing the transition

## Questions 16 of 50

Question:The expression for Bohr's radius of an atom is

$$r = \frac{{{n^2}{h^2}}}{{4{\pi ^2}m{e^4}{z^2}}}$$

$$r = \frac{{{n^2}{h^2}}}{{4{\pi ^2}m{e^2}z}}$$

$$r = \frac{{{n^2}{h^2}}}{{4{\pi ^2}m{e^2}{z^2}}}$$

$$r = \frac{{{n^2}{h^2}}}{{4{\pi ^2}{m^2}{e^2}{z^2}}}$$

## Questions 17 of 50

Question:The energy of an electron revolving in $${n^{th}}$$ Bohr's orbit of an atom is given by the expression

$${E_n} = - \frac{{2{\pi ^2}{m^4}{e^2}{z^2}}}{{{n^2}{h^2}}}$$

$${E_n} = - \frac{{2{\pi ^2}m{e^2}{z^2}}}{{{n^2}{h^2}}}$$

$${E_n} = - \frac{{2{\pi ^2}m{e^4}{z^2}}}{{{n^2}{h^2}}}$$

$${E_n} = - \frac{{2\pi {m^2}{e^2}{z^4}}}{{{n^2}{h^2}}}$$

## Questions 18 of 50

Question:The energy of a photon is calculated by

$$E = h\nu$$

$$h = E\nu$$

$$h = \frac{E}{\nu }$$

$$E = \frac{h}{\nu }$$

## Questions 19 of 50

Question:Visible range of hydrogen spectrum will contain the following series

Pfund

Lyman

Balmer

Brackett

## Questions 20 of 50

Question:The ratio between kinetic energy and the total energy of the electrons of hydrogen atom according to Bohrâ€™s model is

02:01

01:01

1 : â€“ 1

01:02

## Questions 21 of 50

Question:Energy of the electron in Hydrogen atom is given by

$${E_n} = - \frac{{131.38}}{{{n^2}}}\,kJ\,mo{l^{ - 1}}$$

$${E_n} = - \frac{{131.33}}{n}\,kJ\,mo{l^{ - 1}}$$

$${E_n} = - \frac{{1313.3}}{{{n^2}}}\,kJ\,mo{l^{ - 1}}$$

$${E_n} = - \frac{{313.13}}{{{n^2}}}\,kJ\,mo{l^{ - 1}}$$

## Questions 22 of 50

Question:The positive charge of an atom is

Distributed around the nucleus

Concentrated at the nucleus

All of these

## Questions 23 of 50

Question:A metal surface is exposed to solar radiations

The emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations

The emitted electrons have energy less than maximum value of energy depending upon intensity of incident radiation

The emitted electrons have zero energy

The emitted electrons have energy equal to energy of photos of incident light

## Questions 24 of 50

Question:If the velocity of hydrogen molecule is $$5 \times {10^4}cm\,se{c^{ - 1}}$$, then its de-Broglie wavelength is

2 $${\AA}$$

4 $${\AA}$$

8 $${\AA}$$

100 $${\AA}$$

## Questions 25 of 50

Question:A 200g golf ball is moving with a speed of 5 m per hour. The associated wave length is $$(h = 6.625 \times {10^{ - 34}}J{\rm{ - }}sec)$$

$${10^{ - 10}}\,m$$

$${10^{ - 20}}\,m$$

$${10^{ - 30}}\,m$$

$${10^{ - 40}}\,m$$

## Questions 26 of 50

Question:Uncertainty principle gave the concept of

An orbital

Physical meaning of $$\Psi$$

the $${\Psi ^2}$$

All the above

## Questions 27 of 50

Question:The uncertainty principle and the concept of wave nature of matter was proposed by ...... and ...... respectively

Heisenberg, de Broglie

de-Broglie, Heisenberg

Heisenberg, Planck

Planck, Heisenberg

## Questions 28 of 50

Question:The electronic configuration of silver atom in ground state is

$$[Kr]3{d^{10}}\,4{s^1}$$

$$[Xe]\,4{f^{14}}5{d^{10}}6{s^1}$$

$$[Kr]\,4{d^{10}}5{s^1}$$

$$[Kr]\,4{d^9}5{s^2}$$

## Questions 29 of 50

Question:Principal, azimuthal and magnetic quantum numbers are respectively related to

Size, shape and orientation

Shape, size and orientation

Size, orientation and shape

None of the above

## Questions 30 of 50

Question:The number of electrons in the valence shell of calcium is

6

8

2

4

## Questions 31 of 50

Question:The valence electron in the carbon atom are

0

2

4

6

## Questions 32 of 50

Question:For $$ns$$ orbital, the magnetic quantum number has value

2

4

1

0

## Questions 33 of 50

Question:The maximum number of electrons that can be accommodated in the $${M^{th}}$$ shell is

2

8

18

32

## Questions 34 of 50

Question:A sub-shell $$l = 2$$ can take how many electrons

3

10

5

6

## Questions 35 of 50

Question:$$Fe$$ (atomic number = 26) atom has the electronic arrangement

2, 8, 8, 8

2, 8, 16

2, 8,14, 2

2, 8, 12, 4

## Questions 36 of 50

Question:$$C{u^{2 + }}$$ will have the following electronic configuration

$$1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^{10}}$$

$$1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^9},4{s^1}$$

$$1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^9}$$

$$1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^{10}},4{s^1}$$

## Questions 37 of 50

Question:How many electrons can be accommodated in a sub-shell for which $$n = 3,\,l = 1$$

8

6

18

32

## Questions 38 of 50

Question:For azimuthal quantum number $$l = 3$$, the maximum number of electrons will be

2

6

0

14

## Questions 39 of 50

Question:The set of quantum numbers $$n = 3,\,l = 0,\,m = 0,\,s = - 1/2$$ belongs to the element

$$Mg$$

$$Na$$

$$Ne$$

$$F$$

## Questions 40 of 50

Question:An $${e^ - }$$ has magnetic quantum number as $$- 3$$, what is its principal quantum number

1

2

3

4

## Questions 41 of 50

Question:Azimuthal quantum number defines

e/m ratio of electron

Spin of electron

Angular momentum of electron

Magnetic momentum of electron

## Questions 42 of 50

Question:The electronic configuration of element with atomic number 24 is

$$1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^4},4{s^2}$$

$$1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^{10}}$$

$$1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^6}$$

$$1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^5}4{s^1}$$

## Questions 43 of 50

Question:The number of unpaired electrons in $$1{s^2},\,2{s^2}2{p^4}$$ is

4

2

0

1

## Questions 44 of 50

Question:Maximum number of electrons present in $$'N'$$ shell is

18

32

2

8

## Questions 45 of 50

Question:The energy of an electron of $$2{p_y}$$ orbital is

Greater than that of $$2{p_x}$$ orbital

Less than that of $$2{p_x}$$ orbital

Equal to that of $$2s$$ orbital

Same as that of $$2{p_z}$$ orbital

## Questions 46 of 50

Question:Which of the following principles/rules limits the maximum number of electrons in an orbital to two

Aufbau principle

Pauli's exclusion principle

Hund's rule of maximum multiplicity

Heisenberg's uncertainty principle

## Questions 47 of 50

Question:The maximum number of electrons present in an orbit $$l = 3$$, is

6

8

10

14

## Questions 48 of 50

Question:Number of unpaired electrons in $$M{n^{4 + }}$$ is