Atomic Structure Test 6

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:The nucleus of helium contains

Answers Choices:

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

Answers Choices:

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

Answers Choices:

\({10^6}m\)

\({10^{ - 6}}m\)

\({10^{ - 10}}m\)

\({10^{ - 15}}m\)

Questions 4 of 50

Question:The mass of 1 mole of electrons is

Answers Choices:

\(9.1 \times {10^{ - 28}}g\)

\(1.008\,mg\)

\(0.55\,mg\)

\(9.1 \times {10^{ - 27}}g\)

Questions 5 of 50

Question:The mass of an atom is constituted mainly by

Answers Choices:

Neutron and neutrino

Neutron and electron

Neutron and proton

Proton and electron

Questions 6 of 50

Question:The atomic number of an element represents

Answers Choices:

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

Answers Choices:

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

Answers Choices:

35

36

37

38

Questions 9 of 50

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

Answers Choices:

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

Answers Choices:

\( + 1\)

\( - 2\)

\( - 1\)

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

Answers Choices:

\(3.6 \times {10^{ - 19}}C\)

\(1 \times {10^{ - 19}}C\)

\(1.6 \times {10^{ - 19}}C\)

\(2.6 \times {10^{ - 19}}C\)

Questions 12 of 50

Question:Number of neutrons in heavy hydrogen atom is

Answers Choices:

0

1

2

3

Questions 13 of 50

Question:Which of the following is always a whole number

Answers Choices:

Atomic weight

Atomic radii

Equivalent weight

Atomic number

Questions 14 of 50

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

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

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

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

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

Answers Choices:

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

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

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

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

Questions 18 of 50

Question:The energy of a photon is calculated by

Answers Choices:

\(E = h\nu \)

\(h = E\nu \)

\(h = \frac{E}{\nu }\)

\(E = \frac{h}{\nu }\)

Questions 19 of 50

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

Answers Choices:

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 Bohr’s model is

Answers Choices:

02:01

01:01

1 : – 1

01:02

Questions 21 of 50

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

Answers Choices:

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

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

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

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

Questions 22 of 50

Question:The positive charge of an atom is

Answers Choices:

Spread all over the atom

Distributed around the nucleus

Concentrated at the nucleus

All of these

Questions 23 of 50

Question:A metal surface is exposed to solar radiations

Answers Choices:

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

Answers Choices:

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 \((h = 6.625 \times {10^{ - 34}}J{\rm{ - }}sec)\)

Answers Choices:

\({10^{ - 10}}\,m\)

\({10^{ - 20}}\,m\)

\({10^{ - 30}}\,m\)

\({10^{ - 40}}\,m\)

Questions 26 of 50

Question:Uncertainty principle gave the concept of

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

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

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

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

Questions 29 of 50

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

Answers Choices:

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

Answers Choices:

6

8

2

4

Questions 31 of 50

Question:The valence electron in the carbon atom are

Answers Choices:

0

2

4

6

Questions 32 of 50

Question:For \(ns\) orbital, the magnetic quantum number has value

Answers Choices:

2

4

1

0

Questions 33 of 50

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

Answers Choices:

2

8

18

32

Questions 34 of 50

Question:A sub-shell \(l = 2\) can take how many electrons

Answers Choices:

3

10

5

6

Questions 35 of 50

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

Answers Choices:

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

Answers Choices:

\(1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^{10}}\)

\(1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^9},4{s^1}\)

\(1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^9}\)

\(1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^{10}},4{s^1}\)

Questions 37 of 50

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

Answers Choices:

8

6

18

32

Questions 38 of 50

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

Answers Choices:

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

Answers Choices:

\(Mg\)

\(Na\)

\(Ne\)

\(F\)

Questions 40 of 50

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

Answers Choices:

1

2

3

4

Questions 41 of 50

Question:Azimuthal quantum number defines

Answers Choices:

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

Answers Choices:

\(1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^4},4{s^2}\)

\(1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^{10}}\)

\(1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^6}\)

\(1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^5}4{s^1}\)

Questions 43 of 50

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

Answers Choices:

4

2

0

1

Questions 44 of 50

Question:Maximum number of electrons present in \('N'\) shell is

Answers Choices:

18

32

2

8

Questions 45 of 50

Question:The energy of an electron of \(2{p_y}\) orbital is

Answers Choices:

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

Answers Choices:

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

Answers Choices:

6

8

10

14

Questions 48 of 50

Question:Number of unpaired electrons in \(M{n^{4 + }}\) is

Answers Choices:

3

5

6

4