# Atomic Structure Test 4

Total Questions:50 Total Time: 60 Min

Remaining:

## Questions 1 of 50

Question:Heaviest particle is

Meson

Neutron

Proton

Electron

## Questions 2 of 50

Question:Penetration power of proton is

More than electron

Less than electron

More than neutron

None

## Questions 3 of 50

Question:One would expect proton to have very large

Ionization potential

Charge

Hydration energy

## Questions 4 of 50

Question:The number of electrons in one molecule of $$C{O_2}$$are

22

44

66

88

## Questions 5 of 50

Question:Chlorine atom differs from chloride ion in the number of

Proton

Neutron

Electrons

Protons and electrons

## Questions 6 of 50

Question:$$N{a^ + }$$ion is isoelectronic with

$$L{i^ + }$$

$$M{g^{ + 2}}$$

$$C{a^{ + 2}}$$

$$B{a^{ + 2}}$$

## Questions 7 of 50

Question:$$Ca$$ has atomic no. 20 and atomic weight 40. Which of the following statements is not correct about $$Ca$$atom

The number of electrons is same as the number of neutrons

The number of nucleons is double of the number of electrons

The number of protons is half of the number of neutrons

The number of nucleons is double of the atomic number

## Questions 8 of 50

Question:The nucleus of the element $$_{21}{E^{45}}$$ contains

45 protons and 21 neutrons

21 protons and 24 neutrons

21 protons and 45 neutrons

24 protons and 21 neutrons

## Questions 9 of 50

Question:The nitride ion in lithium nitride is composed of

7 protons + 10 electrons

10 protons + 10 electrons

7 protons + 7 protons

10 protons + 7 electrons

## Questions 10 of 50

Question:Which among the following species have the same number of electrons in its outermost as well as penultimate shell

$$M{g^{2 + }}$$

$${O^{2 - }}$$

$${F^ - }$$

$$C{a^{2 + }}$$

## Questions 11 of 50

Question:Energy of orbit

Increases as we move away from nucleus

Decreases as we move away from nucleus

Remains same as we move away from nucleus

None of these

## Questions 12 of 50

Question:What is the packet of energy called

Electron

Photon

Positron

Proton

## Questions 13 of 50

Question:In hydrogen spectrum the different lines of Lyman series are present is

UV field

IR field

Visible field

Far IR field

## Questions 14 of 50

Question:The value of the energy for the first excited state of hydrogen atom will be

$$- \,13.6\,eV$$

$$- \,3.40\,eV$$

$$- \,1.51\,eV$$

$$- \,0.85\,eV$$

## Questions 15 of 50

Question:Bohr model of atom is contradicted by

Pauliâ€™s exclusion principle

Planck quantum theory

Heisenberg uncertainty principle

All of these

## Questions 16 of 50

Question:In Bohrâ€™s model, atomic radius of the first orbit is $$\gamma$$, the radius of the 3rd orbit, is

$$\gamma /3$$

$$\gamma$$

$$3\gamma$$

$$9\gamma$$

## Questions 17 of 50

Question:According to Bohrâ€™s principle, the relation between principle quantum number $$(n)$$ and radius of orbit is

$$r \propto n$$

$$r \propto {n^2}$$

$$r \propto \frac{1}{n}$$

$$r \propto \frac{1}{{{n^2}}}$$

## Questions 18 of 50

Question:An electron has kinetic energy $$2.8 \times {10^{ - 23}}J$$. de-Broglie wavelength will be nearly$$({m_e} = 9.1 \times {10^{ - 31}}kg)$$

$$9.28 \times {10^{ - 4}}\,m$$

$$9.28 \times {10^{ - 7}}\,m$$

$$9.28 \times {10^{ - 8}}\,m$$

$$9.28 \times {10^{ - 10}}\,m$$

## Questions 19 of 50

Question:What will be de-Broglie wavelength of an electron moving with a velocity of $$1.2 \times {10^5}\,m{s^{ - 1}}$$

$$6.068 \times {10^{ - 9}}$$

$$3.133 \times {10^{ - 37}}$$

$$6.626 \times {10^{ - 9}}$$

$$6.018 \times {10^{ - 7}}$$

## Questions 20 of 50

Question:The maximum probability of finding an electron in the $${d_{xy}}$$ orbital is

Along the x-axis

Along the y-axis

At an angle of $${45^o}$$ from the $$x$$ and y-axes

At an angle of $${90^o}$$ from the $$x$$ and y-axes

## Questions 21 of 50

Question:Simultaneous determination of exact position and momentum of an electron is

Possible

Impossible

Sometimes possible sometimes impossible

None of the above

## Questions 22 of 50

Question:The shape of an orbital is given by the quantum number

$$n$$

$$l$$

$$m$$

$$s$$

## Questions 23 of 50

Question:In a given atom no two electrons can have the same values for all the four quantum numbers. This is called

Hund's rule

Aufbau's principle

Uncertainty principle

Pauli's exclusion principle

## Questions 24 of 50

Question:The total number of unpaired electrons in $$d$$- orbitals of atoms of element of atomic number 29 is

10

1

0

5

## Questions 25 of 50

Question:The shape of $$2p$$orbital is

Spherical

Ellipsoidal

Dumb-bell

Pyramidal

## Questions 26 of 50

Question:The four quantum number for the valence shell electron or last electron of sodium (Z = 11) is

$$n = 2,\,l = 1,\,m = - 1,\,s = - \frac{1}{2}$$

$$n = 3,\,l = 0,\,m = 0,\,s = + \frac{1}{2}$$

$$n = 3,\,l = 2,\,m = - 2,\,s = - \frac{1}{2}$$

$$n = 3,\,l = 2,\,m = 2,\,s = + \frac{1}{2}$$

## Questions 27 of 50

Question:The explanation for the presence of three unpaired electrons in the nitrogen atom can be given by

Pauli's exclusion principle

Hund's rule

Aufbau's principle

Uncertainty principle

## Questions 28 of 50

Question:The angular momentum of an electron depends on

Principal quantum number

Azimuthal quantum number

Magnetic quantum number

All of these

## Questions 29 of 50

Question:The electronic configuration of copper $${(_{29}}Cu)$$ is

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

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

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

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

## Questions 30 of 50

Question:Which of the following represents the electronic configuration of an element with atomic number 17

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

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

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

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

## Questions 31 of 50

Question:The shape of $$s$$-orbital is

Pyramidal

Spherical

Tetrahedral

Dumb-bell shaped

## Questions 32 of 50

Question:The shape of $$p$$-orbital is

Elliptical

Spherical

Dumb-bell

Complex geometrical

## Questions 33 of 50

Question:The electronic configuration (outermost) of $$M{n^{ + 2}}$$ ion (atomic number of $$Mn = 25$$) in its ground state is

$$3{d^5},4{s^0}$$

$$3{d^4},4{s^1}$$

$$3{d^3},4{s^2}$$

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

## Questions 34 of 50

Question:The electronic configuration of the element of atomic number 27 is

$$1{s^2},\;2{s^2}2{p^6},\;3{s^2}3{p^6},\;4s\;( \uparrow \downarrow )\;4p\;( \uparrow \downarrow )( \uparrow \downarrow )( \uparrow \downarrow )\;5s\;( \uparrow )$$

$$1{s^2},\;2{s^2}2{p^6},\;3{s^2}3{p^6}3d\;( \uparrow \downarrow )( \uparrow \downarrow )( \uparrow \downarrow ),\;4s\;( \uparrow \downarrow )\;4p\;( \uparrow )$$

$$1{s^2},\;2{s^2}2{p^6},\;3{s^2}3{p^6},\;3d\;( \uparrow \downarrow )( \uparrow \downarrow )( \uparrow \downarrow )( \uparrow \downarrow ),\;4s\;( \uparrow )$$

$$1{s^2},\;2{s^2}2{p^6},\;3{s^2}3{p^6},\;3d\;( \uparrow \downarrow )( \uparrow \downarrow )( \uparrow )( \uparrow )( \uparrow )\;4s\;( \uparrow \downarrow )$$

## Questions 35 of 50

Question:When the value of the principal quantum number $$n$$ is 3, the permitted values of the azimuthal quantum numbers $$l$$ and the magnetic quantum numbers $$m$$ , are $$l$$$$m$$

$$\begin{array}{*{20}{c}} 0 \\ 1 \\ 2 \\\end{array}$$$$\begin{array}{*{20}{c}} 0 \\ { + 1,\,0,\, - 1} \\ { + 2, + 1,\,\,0,\, - 1, - 2} \\\end{array}$$

$$\begin{array}{*{20}{c}} 1 \\ 2 \\ 3 \\\end{array}$$$$\begin{array}{*{20}{c}} 1 \\ { + 2,\,1,\, - 1} \\ { + 3, + 2,\,\,1,\, - 2, - 3} \\\end{array}$$

$$\begin{array}{*{20}{c}} 0 \\ 1 \\ 2 \\\end{array}$$$$\begin{array}{*{20}{c}} 0 \\ {1,\,\,2,\,3} \\ { + 3,\, + 2,\,1,\, - 2, - 3} \\\end{array}$$

$$\begin{array}{*{20}{c}} 1 \\ 2 \\ 3 \\\end{array}$$$$\begin{array}{*{20}{c}} {0,\,\,1} \\ {0,\,\,1,\,\,2} \\ {0,\,\,1,\,\,2,\,\,3} \\\end{array}$$

## Questions 36 of 50

Question:If $$n + l = 6$$, then total possible number of subshells would be

3

4

2

5

## Questions 37 of 50

Question:An electron having the quantum numbers $$n = 4,\,l = 3,\,m = 0$$, $$s = - \frac{1}{2}$$ would be in the orbital

$$3s$$

$$3p$$

$$4d$$

$$4f$$

## Questions 38 of 50

Question:Which one pair of atoms or ions will have same configuration

$${F^ + }$$ and $$Ne$$

$$L{i^ + }$$ and $$H{e^ - }$$

$$C{l^ - }$$ and $$Ar$$

$$Na$$ and K

## Questions 39 of 50

Question:Which of the following sets of quantum number is not possible

$$n = 3;\,l = + 2;\,m = 0;\,s = + \frac{1}{2}$$

$$n = 3;\,l = 0;\,m = 0;\,s = - \frac{1}{2}$$

$$n = 3;\,l = 0;\,m = - 1;\,s = + \frac{1}{2}$$

$$n = 3;\,l = 1;\,m = 0;\,s = - \frac{1}{2}$$

## Questions 40 of 50

Question:Consider the ground state of $$(Z = 24)$$. The numbers of electrons with the azimuthal quantum numbers, $$l = 1$$ and 2 are, respectively

16 and 4

12 and 5

12 and 4

16 and 5

## Questions 41 of 50

Question:The four quantum numbers of the valence electron of potassium are

4, 1, 0 and $$\frac{1}{2}$$

4, 0, 1 and $$\frac{1}{2}$$

4, 0, 0 and $$+ \frac{1}{2}$$

4, 1, 1 and $$\frac{1}{2}$$

## Questions 42 of 50

Question:For sodium atom the number of electrons with $$m = 0$$will be

2

7

9

8

## Questions 43 of 50

Question:The number of electrons that can be accommodated in $$d{z^2}$$orbital is

10

1

4

2

## Questions 44 of 50

Question:A filled or half-filled set of $$p$$ or $$d$$-orbitals is spherically symmetric. Point out the species which has spherical symmetry

$$Na$$

$$C$$

$$C{l^ - }$$

$$Fe$$

## Questions 45 of 50

Question:The atom of the element having atomic number 14 should have

One unpaired electron

Two unpaired electrons

Three unpaired electrons

Four unpaired electrons

## Questions 46 of 50

Question:For the energy levels in an atom, which one of the following statements is correct

There are seven principal electron energy levels

The second principal energy level can have four sub-energy levels and contains a maximum of eight electrons

The $$M$$energy level can have maximum of 32 electrons

The $$4s$$ sub-energy level is at a higher energy than the $$3d$$ sub-energy level

## Questions 47 of 50

Question:The statements (i) In filling a group of orbitals of equal energy, it is energetically preferable to assign electrons to empty orbitals rather than pair them into a particular orbital. (ii) When two electrons are placed in two different orbitals, energy is lower if the spins are parallel are valid for

Aufbau principle

Hund's rule

Pauli's exclusion

principle

Uncertainty principle

## Questions 48 of 50

Question:Orbital angular momentum for a d-electron is

$$\frac{{6h}}{{2\pi }}$$

$$\frac{{\sqrt 6 \,h}}{{2\pi }}$$

$$\frac{{12h}}{{2\pi }}$$

$$\frac{{\sqrt {12} \,h}}{{2\pi }}$$

## Questions 49 of 50

Question:Number of nodal centres for 2s orbital