# Atomic Structure Test 7

Total Questions:50 Total Time: 60 Min

Remaining:

## Questions 1 of 50

Question:Cathode rays are made up of

Positively charged particles

Negatively charged particles

Neutral particles

None of these

## Questions 2 of 50

Question:Anode rays were discovered by

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

02:01

01:02

01:04

01:01

## Questions 4 of 50

Question:Ratio of masses of proton and electron is

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

26

30

36

56

## Questions 6 of 50

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

0

52.9

26.5

105.8

## Questions 7 of 50

Question:The present atomic weight scale is based on

$${C^{12}}$$

$${O^{16}}$$

$${H^1}$$

$${C^{13}}$$

## Questions 8 of 50

Question:Isoelectronic species are

$${K^ + },\,C{l^ - }$$

$$N{a^ + },\,C{l^ - }$$

$$Na,\,Ar$$

$$N{a^ + },\,Ar$$

## Questions 9 of 50

Question:Number of unpaired electrons in inert gas is

Zero

8

4

18

## Questions 10 of 50

Question:In neutral atom, which particles are equivalent

$${p^ + },\,{e^ + }$$

$${e^ - },\,{e^ + }$$

$${e^ - },{p^ + }$$

$${p^ + },{n^o}$$

## Questions 11 of 50

Question:Iso-electronic species is

$${F^ - },\,\,{O^{ - 2}}$$

$${F^ - },\,\,O$$

$${F^ - },\,\,{O^ + }$$

$${F^ - },\,\,{O^{ + 2}}$$

## Questions 12 of 50

Question:An element have atomic weight 40 and itâ€™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

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

Electrons

Protons

Nucleus

Neutrons

## Questions 14 of 50

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

Nucleus

Atom

Electron

Neutron

## Questions 15 of 50

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

Energy is emitted

Energy is absorbed

Atomic number increases

Atomic number decreases

## Questions 16 of 50

Question:Davisson and Germer's experiment showed that

$$\beta$$-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

Hund

Thomson

Rutherford

Sommerfield

## Questions 18 of 50

Discrete values

$$+ ve$$values

$$- ve$$values

Fractional values

## Questions 19 of 50

Question:Radius of the first Bohrâ€™s orbit of hydrogen atom is

$$1.06\,\,{\rm{{\AA}}}$$

$$0.22\,\,{\rm{{\AA}}}$$

$$0.28\,\,{\rm{{\AA}}}$$

$$0.53\,\,{\rm{{\AA}}}$$

## Questions 20 of 50

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

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

2

4

3

5

## Questions 22 of 50

Question:The frequency corresponding to transition $$n = 2$$ to $$n = 1$$ in hydrogen atom is

$$15.66 \times {10^{10}}Hz$$

$$24.66 \times {10^{14}}Hz$$

$$30.57 \times {10^{14}}Hz$$

$$40.57 \times {10^{24}}Hz$$

## Questions 23 of 50

Question:Which of the following transitions have minimum wavelength

$${n_4} \to {n_1}$$

$${n_2} \to {n_1}$$

$${n_4} \to {n_2}$$

$${n_3} \to {n_1}$$

## Questions 24 of 50

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

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

$$1/100cm$$

$$6.6 \times {10^{ - 34}}m$$

$$1.32 \times {10^{ - 35}}m$$

$$6.6 \times {10^{ - 28}}m$$

## Questions 26 of 50

Question:Dual nature of particles was proposed by

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 ($$h = 6.62 \times {10^{ - 34}}kg - {m^2}/s$$)

$$1.05 \times {10^{ - 28}}m$$

$$1.05 \times {10^{ - 26}}m$$

$$5.27 \times {10^{ - 30}}m$$

$$5.25 \times {10^{ - 28}}m$$

## 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

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

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

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

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

## Questions 29 of 50

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

$$5,\,0,\,0,\, + \frac{1}{2}$$

$$5,\,1,\,0,\, + \frac{1}{2}$$

$$5,\,1,\,1,\, + \frac{1}{2}$$

$$6,\,0,\,0,\, + \,\frac{1}{2}$$

## Questions 30 of 50

Question:For the dumb-bell shaped orbital, the value of $$l$$is

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

$$l + 2$$

$$2l + 2$$

$$2l + 1$$

$$l + 1$$

## Questions 32 of 50

Question:For $$d$$electrons, the azimuthal quantum number is

0

1

2

3

## Questions 33 of 50

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

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

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

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

None of these

## Questions 34 of 50

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

$$C{u^ + }$$

$$T{h^{4 + }}$$

$$C{s^ + }$$

$${K^ + }$$

## 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

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

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

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

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

$$[Ar]\,3{d^9}$$

## Questions 37 of 50

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

1

2

3

4

## Questions 38 of 50

Question:The electronic configuration $$1{s^2}2{s^2}2p_x^12p_y^12p_z^1$$

Oxygen

Nitrogen

Hydrogen

Fluorine

## Questions 39 of 50

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

Hundâ€™s rule

Aufbauâ€™s principle

Pauliâ€™s exclusion principle

Heisenbergâ€™s uncertainty principle

## Questions 40 of 50

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

2

0, Â± 1, Â± 2

0, 1, 2

5

## Questions 41 of 50

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

6

2

14

10

## Questions 42 of 50

Question:Number of two electron can have the same values of â€¦â€¦ quantum numbers

One

Two

Three

Four

## Questions 43 of 50

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

2

10

6

14

## Questions 44 of 50

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

$$2{n^2}$$

$$2n$$

$$2(2l + 1)$$

$$(2l + 1)$$

## 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

$$p$$-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

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

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

$$s < p < d < f$$

$$s > p > d > f$$

$$p < d < f < s$$

$$f > d > s > p$$

## Questions 49 of 50

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

$$3s < 3d < 4s < 4p$$

$$1s < 2p < 4s < 3d$$

$$2s < 5s < 4p < 5d$$

$$2s < 2p < 3d < 3p$$

## Questions 50 of 50

Question:Electronic configuration of deuterium atom is

$$1{s^1}$$
$$2{s^2}$$
$$2{s^1}$$
$$1{s^2}$$