# Atomic Structure Test 3

Total Questions:50 Total Time: 60 Min

Remaining:

## Questions 1 of 50

Question:Number of neutron in $${C^{12}}$$ is

6

7

8

9

## Questions 2 of 50

Question:Proton was discovered by

Thomson

Goldstein

Bohr

## Questions 3 of 50

Question:The minimum real charge on any particle which can exist is

$$1.6 \times {10^{ - 19}}\,Coulomb$$

$$1.6 \times {10^{ - 10}}\,Coulomb$$

$$4.8 \times {10^{ - 10}}\,Coulomb$$

Zero

## Questions 4 of 50

Question:The total number of neutrons in dipositive zinc ions with mass number 70 is

34

40

36

38

## Questions 5 of 50

Question:Which of the following are isoelectronic with one another

$$N{a^ + }$$ and $$Ne$$

$${K^ + }$$ and $$O$$

$$Ne$$ and $$O$$

$$N{a^ + }$$ and $${K^ + }$$

## Questions 6 of 50

Question:Compared with an atom of atomic weight 12 and atomic number 6, the atom of atomic weight 13 and atomic number 6

Contains more neutrons

Contains more electrons

Contains more protons

Is a different element

## Questions 7 of 50

Question:In the nucleus of $$_{20}C{a^{40}}$$ there are

40 protons and 20 electrons

20 protons and 40 electrons

20 protons and 20 neutrons

20 protons and 40 neutrons

## Questions 8 of 50

Question:The number of electrons in the nucleus of $${C^{12}}$$ is

6

12

0

3

## Questions 9 of 50

Question:An element has electronic configuration 2, 8, 18, 1. If its atomic weight is 63, then how many neutrons will be present in its nucleus

30

32

34

33

## Questions 10 of 50

Question:Nitrogen atom has an atomic number of 7 and oxygen has an atomic number 8. The total number of electrons in a nitrate ion will be

8

16

32

64

## Questions 11 of 50

Question:If molecular mass and atomic mass of sulphur are 256 and 32 respectively, its atomicity is

2

8

4

16

## Questions 12 of 50

Question:The nucleus of an element contain 9 protons. Its valency would be

1

3

2

5

## Questions 13 of 50

Question:The compound in which cation is isoelectronic with anion is

$$NaCl$$

$$CsF$$

$$NaI$$

$${K_2}S$$

## Questions 14 of 50

Question:Which one of the following is not the characteristic of Planck's quantum theory of radiation

The energy is not absorbed or emitted in whole number or multiple of quantum

Radiation is associated with energy

Radiation energy is not emitted or absorbed conti- nuously but in the form of small packets called quanta

This magnitude of energy associated with a quantum is proportional to the frequency

## Questions 15 of 50

Question:The spectrum of $$He$$ is expected to be similar to

$$H$$

$$L{i^ + }$$

$$Na$$

$$H{e^ + }$$

## Questions 16 of 50

Question:The postulate of Bohr theory that electrons jump from one orbit to the other, rather than flow is according to

The quantisation concept

The wave nature of electron

The probability expression for electron

Heisenberg uncertainty principle

## Questions 17 of 50

Question:The frequency of an electromagnetic radiation is $$2 \times {10^6}Hz$$. What is its wavelength in metres (Velocity of light $$= 3 \times {10^8}m{s^{ - 1}}$$)

$$6.0 \times {10^{14}}$$

$$1.5 \times {10^4}$$

$$1.5 \times {10^2}$$

$$0.66 \times {10^{ - 2}}$$

## Questions 18 of 50

Question:The radius of the nucleus is related to the mass number $$A$$ by

$$R = {R_o}{A^{1/2}}$$

$$R = {R_o}A$$

$$R = {R_o}{A^2}$$

$$R = {R_o}{A^{1/3}}$$

## Questions 19 of 50

Question:The specific charge of proton is $$9.6 \times {10^6}C\,k{g^{ - 1}}$$ then for an a-particle it will be

$$38.4 \times {10^7}C\,k{g^{ - 1}}$$

$$19.2 \times {10^7}C\,k{g^{ - 1}}$$

$$2.4 \times {10^7}C\,k{g^{ - 1}}$$

$$4.8 \times {10^7}C\,k{g^{ - 1}}$$

## Questions 20 of 50

Question:The frequency of yellow light having wavelength 600 nm is

$$5.0 \times {10^{14}}Hz$$

$$2.5 \times {10^7}Hz$$

$$5.0 \times {10^7}Hz$$

$$2.5 \times {10^{14}}Hz$$

## Questions 21 of 50

Question:The wavelength of the radiation emitted, when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant $$= \,1.097\, \times \,{10^7}{m^{ - 1}}$$)

406 nm

192 nm

91 nm

$$9.1\, \times \,{10^{ - 8}}\,\,nm$$

## Questions 22 of 50

Question:The de-Broglie wavelength associated with a material particle is

Directly proportional to its energy

Directly proportional to momentum

Inversely proportional to its energy

Inversely proportional to momentum

## Questions 23 of 50

Question:Which one is not the correct relation in the following

$$h = \frac{E}{v}$$

$$E = m{c^2}$$

$$\Delta x \times \Delta p = \frac{h}{{4\pi }}$$

$$\lambda = \frac{h}{{mv}}$$

## Questions 24 of 50

Question:The quantum number which specifies the location of an electron as well as energy is

Principal quantum number

Azimuthal quantum number

Spin quantum number

Magnetic quantum number

## Questions 25 of 50

Question:Which orbital is dumb-bell shaped

$$s$$-orbital

$$p$$-orbital

$$d$$-orbital

$$f$$-orbital

## Questions 26 of 50

Question:The number of orbitals in the fourth principal quantum number will be

4

8

12

16

## Questions 27 of 50

Question:Which set of quantum numbers are not possible from the following

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

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

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

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

## Questions 28 of 50

Question:Which electronic configuration is not observing the ($$n + l$$) rule

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

$$1{s^2},2{s^2}s{p^6},3{s^2}3{p^6}3{d^7},4{s^2}$$

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

$$1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^8},4{s^2}$$

## Questions 29 of 50

Question:The four quantum numbers of the outermost orbital of $$K$$ (atomic no. =19) are

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

$$n = 4,\,l = 0,\,m = 0,\,s = + \frac{1}{2}$$

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

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

## Questions 30 of 50

Question:The electronic configuration of an element with atomic number 7 i.e. nitrogen atom is

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

$$1{s^2},2{s^2}2p_x^22p_y^1$$

$$1{s^2},2{s^2}2p_x^12p_y^12p_z^1$$

$$1{s^2},2{s^2}2p_x^12p_y^2$$

## Questions 31 of 50

Question:In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields (1)$$n = 1,\,l = 0,\,m = 0$$(2)$$n = 2,\,l = 0,\,m = 0$$ (3)$$n = 2,\,l = 1,\,m = 1$$(4)$$n = 3,\,l = 2,\,m = 0$$ (5)$$n = 3,\,l = 2,\,m = 0$$

(1) and (2)

(2) and (3)

(3) and (4)

(4) and (5)

## Questions 32 of 50

Question:There is no difference between a $$2p$$ and a $$3p$$orbital regarding

Shape

Size

Energy

Value of $$n$$

## Questions 33 of 50

Question:The electronic configuration of chromium is

$$[Ne]3{s^2}3{p^6}3{d^4},4{s^2}$$

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

$$[Ne]3{s^2}3{p^6},4{s^2}4{p^4}$$

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

## Questions 34 of 50

Question:A $$3p$$orbital has

Two spherical nodes

Two non-spherical nodes

One spherical and one non-spherical nodes

One spherical and two non-spherical nodes

## Questions 35 of 50

Question:All electrons on the $$4p$$ sub-shell must be characterized by the quantum number(s)

$$n = 4,\,m = 0,\,s = \pm \frac{1}{2}$$

$$l = 1$$

$$l = 0,\,s = \pm \frac{1}{2}$$

$$s = \pm \frac{1}{2}$$

## Questions 36 of 50

Question:$$1{s^2}2{s^2}2{p^6}3{s^1}$$ shows configuration of

$$A{l^{3 + }}$$ in ground state

$$Ne$$ in excited state

$$M{g^ + }$$ in excited state

None of these

## Questions 37 of 50

Question:Electronic configuration of $$S{c^{21}}$$ is

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

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

$$1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}4{s^0}3{d^3}$$

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

## Questions 38 of 50

Question:Which of the following set of quantum numbers is possible

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

$$n = 3;\,\,l = 4;\,\,m = 0$$ and $$s = - \frac{1}{2}$$

$$n = 4;\,l = 0;\,\,m = 2$$ and $$s = + \frac{1}{2}$$

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

## Questions 39 of 50

Question:Which of the following set of quantum number is not valid

$$n = 1,\,\,l = 2$$

$$3 = 2,\,\,m = 1$$

$$m = 3,\,\,l = 0$$

$$3 = 4,\,\,l = 2$$

## Questions 40 of 50

Question:The number of $$2p$$ electrons having spin quantum number $$s = - 1/2$$ are

6

0

2

3

## Questions 41 of 50

Question:Which of the following sets of quantum numbers is correct for an electron in $$4f$$ orbital

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

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

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

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

## Questions 42 of 50

Question:The maximum number of electrons in an atom with $$l = 2$$ and $$n = 3$$ is

2

6

12

10

## Questions 43 of 50

Question:The configuration $$1{s^2}2{s^2}2{p^5}3{s^1}$$ shows

Ground state of fluorine atom

Excited state of fluorine atom

Excited state of neon atom

Excited state of ion $$O_2^ -$$

## Questions 44 of 50

Question:The maximum number of unpaired electron can be present in $$d$$orbitals are

1

3

5

7

## Questions 45 of 50

Question:The molecule having one unpaired electron is

$$NO$$

$$CO$$

$$C{N^ - }$$

$${O_2}$$

## Questions 46 of 50

Question:Which of the following has the least energy

$$2p$$

$$3p$$

$$2s$$

$$4d$$

## Questions 47 of 50

Question:Pauli's exclusion principle states that

Nucleus of an atom contains no negative charge

Electrons move in circular orbits around the nucleus

Electrons occupy orbitals of lowest energy

All the four quantum numbers of two electrons in an atom cannot be equal

## Questions 48 of 50

Question:The orbital with maximum energy is

3d

5p

4s

6d

## Questions 49 of 50

Question:p-orbitals of an atom in presence of magnetic field are