# Atomic Structure Test 2

Total Questions:50 Total Time: 60 Min

Remaining:

## Questions 1 of 50

Question:The fundamental particles present in the nucleus of an atom are

Alpha particles and electrons

Neutrons and protons

Neutrons and electrons

Electrons, neutrons and protons

## Questions 2 of 50

Question:The order of density in nucleus is

$${10^8}kg/cc$$

$${10^{ - 8}}kg/cc$$

$${10^{ - 9}}kg/cc$$

$${10^{12}}kg/cc$$

## Questions 3 of 50

Question:Which phrase would be incorrect to use

A molecular of a compound

A molecule of an element

An atom of an element

None of these

## Questions 4 of 50

Question:Which one of the following pairs is not correctly matched

Rutherford-Proton

J.J. Thomsom-Electron

Bohr-Isotope

## Questions 5 of 50

Question:The nucleus of the element having atomic number 25 and atomic weight 55 will contain

25 protons and 30 neutrons

25 neutrons and 30 protons

55 protons

55 neutrons

## Questions 6 of 50

Question:If W is atomic weight and N is the atomic number of an element, then

Number of $${e^{ - 1}} = W - N$$

Number of $$_0{n^1} = W - N$$

Number of $$_1{H^1} = W - N$$

Number of $$_0{n^1} = N$$

## Questions 7 of 50

Question:An atom has the electronic configuration of $$1{s^2},2{s^2}2{p^6}$$, $$3{s^2}3{p^6}3{d^{10}},4{s^2}4{p^5}$$. Its atomic weight is 80. Its atomic number and the number of neutrons in its nucleus shall be

35 and 45

45 and 35

40 and 40

30 and 50

## Questions 8 of 50

Question:Which of the following particles has more electrons than neutrons

$$C$$

$${F^ - }$$

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

$$A{l^{ + 3}}$$

## Questions 9 of 50

Question:$$C{O_2}$$ is isostructural with

$$SnC{l_2}$$

$$S{O_2}$$

$$HgC{l_2}$$

All the above

## Questions 10 of 50

Question:The hydride ions $$({H^ - })$$ are isoelectronic with

$$Li$$

$$H{e^ + }$$

$$He$$

$$Be$$

## Questions 11 of 50

Question:$$B{e^{2 + }}$$ is isoelectronic with

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

$$N{a^ + }$$

$$L{i^ + }$$

$${H^ + }$$

## Questions 12 of 50

Question:An isostere is

$$NO_2^ -$$ and $${O_3}$$

$$NO_2^ -$$ and $$PO_4^{3 - }$$

$$C{O_2},\,{N_2}O,\,NO_3^ -$$

$$ClO_4^ -$$ and $$OC{N^ - }$$

## Questions 13 of 50

Question:Tritium is the isotope of

Hydrogen

Oxygen

Carbon

Sulpher

## Questions 14 of 50

Question:The atomic number of an element is 35. What is the total number of electrons present in all the p-orbitals of the ground state atom of that element

6

11

17

23

## Questions 15 of 50

Question:When an electron jumps from $$L$$ to $$K$$ shell

Energy is absorbed

Energy is released

Energy is sometimes absorbed and sometimes released

Energy is neither absorbed nor released

## Questions 16 of 50

Question:When beryllium is bombarded with $$\alpha$$-particles, extremely penetrating radiations which cannot be deflected by electrical or magnetic field are given out. These are

A beam of protons

$$\alpha$$-rays

A beam of neutrons

X-rays

## Questions 17 of 50

Question:When an electron revolves in a stationary orbit then

It absorbs energy

It gains kinetic energy

Its energy remains constant

## Questions 18 of 50

Question:A moving particle may have wave motion, if

Its mass is very high

Its velocity is negligible

Its mass is negligible

Its mass is very high and velocity is negligible

## Questions 19 of 50

Question:The element used by Rutherford in his famous scattering experiment was

Gold

Tin

Silver

## Questions 20 of 50

Question:If electron falls from $$n = 3$$ to $$n = 2$$, then emitted energy is

$$10.2eV$$

$$12.09eV$$

$$1.9eV$$

$$0.65eV$$

## Questions 21 of 50

Question:The energy of a radiation of wavelength 8000Å is $${E_1}$$and energy of a radiation of wavelength 16000 $${\AA}$$ is $${E_2}$$. What is the relation between these two

$${E_1} = 6{E_2}$$

$${E_1} = 2{E_2}$$

$${E_1} = 4{E_2}$$

$${E_1} = 1/2{E_2}$$

$${E_1} = {E_2}$$

## Questions 22 of 50

Question:The formation of energy bonds in solids are in accordance with

Heisenbergâ€™s uncertainty principle

Bohrâ€™s theory

Ohmâ€™s law

Rutherfordâ€™s atomic model

## Questions 23 of 50

Question:The radius of which of the following orbit is same as that of the first Bohr's orbit of hydrogen atom

$$H{e^ + }(n = 2)$$

$$L{i^{2 + }}(n = 2)$$

$$L{i^{2 + }}(n = 3)$$

$$B{e^{3 + }}(n = 2)$$

## Questions 24 of 50

Question:The frequency of radiation emitted when the electron falls from $$n = 4$$ to $$n = 1$$ in a hydrogen atom will be (Given ionization energy of H$$= 2.18 \times {10^{ - 18}}J\,\,\,{\rm{ato}}{{\rm{m}}^{ - 1}}$$and $$h = 6.625 \times {10^{ - 34}}Js$$)

$$3.08 \times {10^{15}}{s^{ - 1}}$$

$$2.00 \times {10^{15}}{s^{ - 1}}$$

$$1.54 \times {10^{15}}{s^{ - 1}}$$

$$1.03 \times {10^{15}}{s^{ - 1}}$$

## Questions 25 of 50

Question:The de-Broglie wavelength of a particle with mass $$1gm$$ and velocity $$100m/\sec$$ is

$$6.63 \times {10^{ - 33}}m$$

$$6.63 \times {10^{ - 34}}m$$

$$6.63 \times {10^{ - 35}}m$$

$$6.65 \times {10^{ - 35}}m$$

## Questions 26 of 50

Question:Minimum de-Broglie wavelength is associated with

Electron

Proton

$$C{O_2}$$ molecule

$$S{O_2}$$ molecule

## Questions 27 of 50

Question:The position and velocity of a small particle like electron cannot be simultaneously determined.â€ This statement is

Heisenberg uncertainty principle

Principle of de Broglie's wave nature of electron

Pauli's exclusion principle

Aufbau's principle

## Questions 28 of 50

Question:In Heisenberg's uncertainty equation $$\Delta x \times \Delta p \ge \frac{h}{{4\pi }}$$; $$\Delta p$$ stands for

Uncertainty in energy

Uncertainty in velocity

Uncertainty in momentum

Uncertainty in mass

## Questions 29 of 50

Question:For an electron if the uncertainty in velocity is $$\Delta \nu$$, the uncertainty in its position $$(\Delta x)$$ is given by

$$\frac{{hm}}{{4\pi \Delta \nu }}$$

$$\frac{{4\pi }}{{hm\Delta \nu }}$$

$$\frac{h}{{4\pi m\Delta \nu }}$$

$$\frac{{4\pi \;m}}{{h\;.\;\Delta \nu }}$$

## Questions 30 of 50

Question:Orbital is

Circular path around the nucleus in which the electron revolves

Space around the nucleus where the probability of finding the electron is maximum

Amplitude of electrons wave

None of these

## Questions 31 of 50

Question:The magnetic quantum number specifies

Size of orbitals

Shape of orbitals

Orientation of orbitals

Nuclear stability

## Questions 32 of 50

Question:If $$n = 3$$, then the value of $$'l'$$ which is incorrect

0

1

2

3

## Questions 33 of 50

Question:The total number of orbitals in an energy level designated by principal quantum number $$n$$ is equal to

$$2n$$

$$2{n^2}$$

$$n$$

$${n^2}$$

## Questions 34 of 50

Question:In any atom which sub-shell will have the highest energy in the following

$$3p$$

$$3d$$

$$4s$$

$$3s$$

## Questions 35 of 50

Question:The magnetic quantum number for valency electrons of sodium is

3

2

1

0

## Questions 36 of 50

Question:Electronic configuration of $$C$$ is

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

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

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

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

## Questions 37 of 50

Question:Azimuthal quantum number for last electron of $$Na$$ atom is

1

2

3

0

## Questions 38 of 50

Question:Which statement is not correct for $$n = 5$$, $$m = 3$$

$$l = 4$$

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

$$l = 3$$

All are correct

## Questions 39 of 50

Question:Which of the following electronic configurations is not possible

$$1{s^2}\,\,2{s^2}$$

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

$$3{d^{10}}4{s^2}4{p^2}$$

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

## Questions 40 of 50

Question:The electronic configuration of an element is $$1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}3{d^5}4{s^1}$$. This represents its

Excited state

Ground state

Cationic form

Anionic form

## Questions 41 of 50

Question:Which of the following sets is possible for quantum numbers

$$n = 4,\,l = 3,\,m = - 2,\,s = 0$$

$$n = 4,\,l = 4,\,m = + 2,\,s = - \frac{1}{2}$$

$$n = 4,\,l = 4,\,m = - 2,\,s = + \frac{1}{2}$$

$$n = 4,\,l = 3,\,m = - 2,\,s = + \frac{1}{2}$$

## Questions 42 of 50

Question:For principle quantum number $$n = 4$$ the total number of orbitals having $$l = 3$$

3

7

5

9

## Questions 43 of 50

Question:The number of electrons in the atom which has 20 protons in the nucleus

20

10

30

40

## Questions 44 of 50

Question:The maximum number of electrons accommodated in $$5f$$orbitals are

5

10

14

18

## Questions 45 of 50

Question:Which of the following metal ions will have maximum number of unpaired electrons

$$F{e^{ + 2}}$$

$$C{O^{ + 2}}$$

$$N{i^{ + 2}}$$

$$M{n^{ + 2}}$$

## Questions 46 of 50

Question:Which of the metal ion will have highest number of unpaired electrons

$$C{u^ + }$$

$$F{e^{2 + }}$$

$$F{e^{3 + }}$$

$$C{o^{2 + }}$$

## Questions 47 of 50

Question:How many unpaired electrons are present in cobalt [Co] metal

2

3

4

7

## Questions 48 of 50

Question:The number of unpaired electrons in nitrogen is

1

3

2

None of these

## Questions 49 of 50

Question:The atomic orbitals are progressively filled in order of increasing energy. This principle is called as

Hundâ€™s rule

Aufbau principle

Exclusion principle

de-Broglie rule

## Questions 50 of 50

Question:The correct order of increasing energy of atomic orbitals is

$$5p < 4f < 6s < 5d$$
$$5p < 6s < 4f < 5d$$
$$4f < 5p < 5d < 6s$$
$$5p < 5d < 4f < 6s$$