Atomic Structure Test 7

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:Cathode rays are made up of

Answers Choices:

Positively charged particles

Negatively charged particles

Neutral particles

None of these

Questions 2 of 50

Question:Anode rays were discovered by

Answers Choices:

Goldstein

J. Stoney

Rutherford

J.J. Thomson

Questions 3 of 50

Question:The ratio of specific charge of a proton and an \(\alpha \)-particle is

Answers Choices:

02:01

01:02

01:04

01:01

Questions 4 of 50

Question:Ratio of masses of proton and electron is

Answers Choices:

Infinite

\(1.8 \times {10^3}\)

1.8

None of these

Questions 5 of 50

Question:An atom has 26 electrons and its atomic weight is 56. The number of neutrons in the nucleus of the atom will be

Answers Choices:

26

30

36

56

Questions 6 of 50

Question:The most probable radius (in pm) for finding the electron in \(H{e^ + }\) is

Answers Choices:

0

52.9

26.5

105.8

Questions 7 of 50

Question:The present atomic weight scale is based on

Answers Choices:

\({C^{12}}\)

\({O^{16}}\)

\({H^1}\)

\({C^{13}}\)

Questions 8 of 50

Question:Isoelectronic species are

Answers Choices:

\({K^ + },\,C{l^ - }\)

\(N{a^ + },\,C{l^ - }\)

\(Na,\,Ar\)

\(N{a^ + },\,Ar\)

Questions 9 of 50

Question:Number of unpaired electrons in inert gas is

Answers Choices:

Zero

8

4

18

Questions 10 of 50

Question:In neutral atom, which particles are equivalent

Answers Choices:

\({p^ + },\,{e^ + }\)

\({e^ - },\,{e^ + }\)

\({e^ - },{p^ + }\)

\({p^ + },{n^o}\)

Questions 11 of 50

Question:Iso-electronic species is

Answers Choices:

\({F^ - },\,\,{O^{ - 2}}\)

\({F^ - },\,\,O\)

\({F^ - },\,\,{O^ + }\)

\({F^ - },\,\,{O^{ + 2}}\)

Questions 12 of 50

Question:An element have atomic weight 40 and it’s electronic configuration is \(1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}.\) Then its atomic number and number of neutrons will be

Answers Choices:

18 and 22

22 and 18

26 and 20

40 and 18

Questions 13 of 50

Question:Rutherford's experiment on scattering of particles showed for the first time that the atom has

Answers Choices:

Electrons

Protons

Nucleus

Neutrons

Questions 14 of 50

Question:Rutherford's scattering experiment is related to the size of the

Answers Choices:

Nucleus

Atom

Electron

Neutron

Questions 15 of 50

Question:When an electron drops from a higher energy level to a low energy level, then

Answers Choices:

Energy is emitted

Energy is absorbed

Atomic number increases

Atomic number decreases

Questions 16 of 50

Question:Davisson and Germer's experiment showed that

Answers Choices:

\(\beta \)-particles are electrons

Electrons come from nucleus

Electrons show wave nature

None of the above

Questions 17 of 50

Question:Who modified Bohr's theory by introducing elliptical orbits for electron path

Answers Choices:

Hund

Thomson

Rutherford

Sommerfield

Questions 18 of 50

Question:Bohr's radius can have

Answers Choices:

Discrete values

\( + ve\)values

\( - ve\)values

Fractional values

Questions 19 of 50

Question:Radius of the first Bohr’s orbit of hydrogen atom is

Answers Choices:

\(1.06\,\,{\rm{{\AA}}}\)

\(0.22\,\,{\rm{{\AA}}}\)

\(0.28\,\,{\rm{{\AA}}}\)

\(0.53\,\,{\rm{{\AA}}}\)

Questions 20 of 50

Question:In Balmer series of hydrogen atom spectrum which electronic transition causes third line

Answers Choices:

Fifth Bohr orbit to second one

Fifth Bohr orbit to first one

Fourth Bohr orbit to second one

Fourth Bohr orbit to first one

Questions 21 of 50

Question:Ratio of radii of second and first Bohr orbits of H atom

Answers Choices:

2

4

3

5

Questions 22 of 50

Question:The frequency corresponding to transition \(n = 2\) to \(n = 1\) in hydrogen atom is

Answers Choices:

\(15.66 \times {10^{10}}Hz\)

\(24.66 \times {10^{14}}Hz\)

\(30.57 \times {10^{14}}Hz\)

\(40.57 \times {10^{24}}Hz\)

Questions 23 of 50

Question:Which of the following transitions have minimum wavelength

Answers Choices:

\({n_4} \to {n_1}\)

\({n_2} \to {n_1}\)

\({n_4} \to {n_2}\)

\({n_3} \to {n_1}\)

Questions 24 of 50

Question:De broglie equation describes the relationship of wavelength associated with the motion of an electron and its

Answers Choices:

Mass

Energy

Momentum

Charge

Questions 25 of 50

Question:A cricket ball of \(0.5\,kg\) is moving with a velocity of \(100\,m/\sec \). The wavelength associated with its motion is

Answers Choices:

\(1/100cm\)

\(6.6 \times {10^{ - 34}}m\)

\(1.32 \times {10^{ - 35}}m\)

\(6.6 \times {10^{ - 28}}m\)

Questions 26 of 50

Question:Dual nature of particles was proposed by

Answers Choices:

Heisenberg

Lowry

de-Broglie

Schrodinger

Questions 27 of 50

Question:The uncertainty in momentum of an electron is \(1 \times {10^{ - 5}}kg - m/s\). The uncertainty in its position will be (\(h = 6.62 \times {10^{ - 34}}kg - {m^2}/s\))

Answers Choices:

\(1.05 \times {10^{ - 28}}m\)

\(1.05 \times {10^{ - 26}}m\)

\(5.27 \times {10^{ - 30}}m\)

\(5.25 \times {10^{ - 28}}m\)

Questions 28 of 50

Question:The uncertainty in the position of a moving bullet of mass 10 gm is \({10^{ - 5}}m\). Calculate the uncertainty in its velocity

Answers Choices:

\(5.2 \times {10^{ - 28}}m/sec\)

\(3.0 \times {10^{ - 28}}m/sec\)

\(5.2 \times {10^{ - 22}}m/sec\)

\(3 \times {10^{ - 22}}m/sec\)

Questions 29 of 50

Question:Correct set of four quantum numbers for valence electron of rubidium (Z = 37) is

Answers Choices:

\(5,\,0,\,0,\, + \frac{1}{2}\)

\(5,\,1,\,0,\, + \frac{1}{2}\)

\(5,\,1,\,1,\, + \frac{1}{2}\)

\(6,\,0,\,0,\, + \,\frac{1}{2}\)

Questions 30 of 50

Question:For the dumb-bell shaped orbital, the value of \(l\)is

Answers Choices:

3

1

0

2

Questions 31 of 50

Question:For a given value of quantum number \(l\), the number of allowed values of \(m\) is given by

Answers Choices:

\(l + 2\)

\(2l + 2\)

\(2l + 1\)

\(l + 1\)

Questions 32 of 50

Question:For \(d\)electrons, the azimuthal quantum number is

Answers Choices:

0

1

2

3

Questions 33 of 50

Question:Which one is the electronic configuration of \(F{e^{ + 2}}\)

Answers Choices:

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

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

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

None of these

Questions 34 of 50

Question:An ion has 18 electrons in the outermost shell, it is

Answers Choices:

\(C{u^ + }\)

\(T{h^{4 + }}\)

\(C{s^ + }\)

\({K^ + }\)

Questions 35 of 50

Question:An electron has principal quantum number 3. The number of its (i) sub-shells and (ii) orbitals would be respectively

Answers Choices:

3 and 5

3 and 7

3 and 9

2 and 5

Questions 36 of 50

Question:What is the electronic configuration of \(C{u^{2 + }}(Z = 29)\) of least position

Answers Choices:

\([Ar]\,4{s^1}3{d^8}\)

\([Ar]\,4{s^2}3{d^{10}}4{p^1}\)

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

\([Ar]\,3{d^9}\)

Questions 37 of 50

Question:The number of quantum numbers required to describe an electron in an atom completely is

Answers Choices:

1

2

3

4

Questions 38 of 50

Question:The electronic configuration \(1{s^2}2{s^2}2p_x^12p_y^12p_z^1\)

Answers Choices:

Oxygen

Nitrogen

Hydrogen

Fluorine

Questions 39 of 50

Question:Quantum numbers of an atom can be defined on the basis of

Answers Choices:

Hund’s rule

Aufbau’s principle

Pauli’s exclusion principle

Heisenberg’s uncertainty principle

Questions 40 of 50

Question:The total magnetic quantum numbers for d-orbital is given by

Answers Choices:

2

0, ± 1, ± 2

0, 1, 2

5

Questions 41 of 50

Question:The maximum number of electrons in \(p\)-orbital with \(n = 5,\,m = 1\) is

Answers Choices:

6

2

14

10

Questions 42 of 50

Question:Number of two electron can have the same values of …… quantum numbers

Answers Choices:

One

Two

Three

Four

Questions 43 of 50

Question:The maximum number of electrons that can be accommodated in a \(3d\) subshell is

Answers Choices:

2

10

6

14

Questions 44 of 50

Question:The maximum number of electrons which each sub-shell can occupy is

Answers Choices:

\(2{n^2}\)

\(2n\)

\(2(2l + 1)\)

\((2l + 1)\)

Questions 45 of 50

Question:The number of \(d\) electrons in \(F{e^{ + 2}}\) (atomic number of \(Fe = 26\)) is not equal to that of the

Answers Choices:

\(p\)-electrons in \(Ne\) (At. No.= 10)

\(s\)-electrons in \(Mg\) (At. No.= 12)

\(d\)-electrons in \(Fe\)

\(p\)-electrons in \(C{l^ - }\) (At. No. of \(Cl\) = 17)

Questions 46 of 50

Question:A transition metal \(X\) has a configuration \([Ar]3{d^4}\) in its \( + 3\) oxidation state. Its atomic number is

Answers Choices:

25

26

22

19

Questions 47 of 50

Question:The electrons would go to lower energy levels first and then to higher energy levels according to which of the following

Answers Choices:

Aufbau principle

Pauli's exclusion principle

Hund's rule of maximum multiplicity

Heisenberg's uncertainty principle

Questions 48 of 50

Question:Energy of atomic orbitals in a particular shell is in the order

Answers Choices:

\(s < p < d < f\)

\(s > p > d > f\)

\(p < d < f < s\)

\(f > d > s > p\)

Questions 49 of 50

Question:Which of the following sequence is correct as per Aufbau principle

Answers Choices:

\(3s < 3d < 4s < 4p\)

\(1s < 2p < 4s < 3d\)

\(2s < 5s < 4p < 5d\)

\(2s < 2p < 3d < 3p\)

Questions 50 of 50

Question:Electronic configuration of deuterium atom is

Answers Choices:

\(1{s^1}\)

\(2{s^2}\)

\(2{s^1}\)

\(1{s^2}\)