Atomic Structure Test 3

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:Number of neutron in \({C^{12}}\) is

Answers Choices:

6

7

8

9

Questions 2 of 50

Question:Proton was discovered by

Answers Choices:

Chadwick

Thomson

Goldstein

Bohr

Questions 3 of 50

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

Answers Choices:

\(1.6 \times {10^{ - 19}}\,Coulomb\)

\(1.6 \times {10^{ - 10}}\,Coulomb\)

\(4.8 \times {10^{ - 10}}\,Coulomb\)

Zero

Questions 4 of 50

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

Answers Choices:

34

40

36

38

Questions 5 of 50

Question:Which of the following are isoelectronic with one another

Answers Choices:

\(N{a^ + }\) 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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

2

8

4

16

Questions 12 of 50

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

Answers Choices:

1

3

2

5

Questions 13 of 50

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

Answers Choices:

\(NaCl\)

\(CsF\)

\(NaI\)

\({K_2}S\)

Questions 14 of 50

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

Answers Choices:

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

Answers Choices:

\(H\)

\(L{i^ + }\)

\(Na\)

\(H{e^ + }\)

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

Answers Choices:

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 \( = 3 \times {10^8}m{s^{ - 1}}\))

Answers Choices:

\(6.0 \times {10^{14}}\)

\(1.5 \times {10^4}\)

\(1.5 \times {10^2}\)

\(0.66 \times {10^{ - 2}}\)

Questions 18 of 50

Question:The radius of the nucleus is related to the mass number \(A\) by

Answers Choices:

\(R = {R_o}{A^{1/2}}\)

\(R = {R_o}A\)

\(R = {R_o}{A^2}\)

\(R = {R_o}{A^{1/3}}\)

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

Answers Choices:

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

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

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

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

Questions 20 of 50

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

Answers Choices:

\(5.0 \times {10^{14}}Hz\)

\(2.5 \times {10^7}Hz\)

\(5.0 \times {10^7}Hz\)

\(2.5 \times {10^{14}}Hz\)

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 \( = \,1.097\, \times \,{10^7}{m^{ - 1}}\))

Answers Choices:

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

Answers Choices:

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

Answers Choices:

\(h = \frac{E}{v}\)

\(E = m{c^2}\)

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

\(\lambda = \frac{h}{{mv}}\)

Questions 24 of 50

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

Answers Choices:

Principal quantum number

Azimuthal quantum number

Spin quantum number

Magnetic quantum number

Questions 25 of 50

Question:Which orbital is dumb-bell shaped

Answers Choices:

\(s\)-orbital

\(p\)-orbital

\(d\)-orbital

\(f\)-orbital

Questions 26 of 50

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

Answers Choices:

4

8

12

16

Questions 27 of 50

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

Answers Choices:

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

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

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

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

Questions 28 of 50

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

Answers Choices:

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

\(1{s^2},2{s^2}s{p^6},3{s^2}3{p^6}3{d^7},4{s^2}\)

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

\(1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}3{d^8},4{s^2}\)

Questions 29 of 50

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

Answers Choices:

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

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

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

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

Questions 30 of 50

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

Answers Choices:

\(1{s^2},2{s^1},2p_x^3\)

\(1{s^2},2{s^2}2p_x^22p_y^1\)

\(1{s^2},2{s^2}2p_x^12p_y^12p_z^1\)

\(1{s^2},2{s^2}2p_x^12p_y^2\)

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)\(n = 3,\,l = 2,\,m = 0\)

Answers Choices:

(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

Answers Choices:

Shape

Size

Energy

Value of \(n\)

Questions 33 of 50

Question:The electronic configuration of chromium is

Answers Choices:

\([Ne]3{s^2}3{p^6}3{d^4},4{s^2}\)

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

\([Ne]3{s^2}3{p^6},4{s^2}4{p^4}\)

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

Questions 34 of 50

Question:A \(3p\)orbital has

Answers Choices:

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)

Answers Choices:

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

\(l = 1\)

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

\(s = \pm \frac{1}{2}\)

Questions 36 of 50

Question:\(1{s^2}2{s^2}2{p^6}3{s^1}\) shows configuration of

Answers Choices:

\(A{l^{3 + }}\) 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

Answers Choices:

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

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

\(1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}4{s^0}3{d^3}\)

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

Questions 38 of 50

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

Answers Choices:

\(n = 3;\,\,l = 2;\,\,m = 2\) 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

Answers Choices:

\(n = 1,\,\,l = 2\)

\(3 = 2,\,\,m = 1\)

\(m = 3,\,\,l = 0\)

\(3 = 4,\,\,l = 2\)

Questions 40 of 50

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

Answers Choices:

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

Answers Choices:

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

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

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

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

Questions 42 of 50

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

Answers Choices:

2

6

12

10

Questions 43 of 50

Question:The configuration \(1{s^2}2{s^2}2{p^5}3{s^1}\) shows

Answers Choices:

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

Answers Choices:

1

3

5

7

Questions 45 of 50

Question:The molecule having one unpaired electron is

Answers Choices:

\(NO\)

\(CO\)

\(C{N^ - }\)

\({O_2}\)

Questions 46 of 50

Question:Which of the following has the least energy

Answers Choices:

\(2p\)

\(3p\)

\(2s\)

\(4d\)

Questions 47 of 50

Question:Pauli's exclusion principle states that

Answers Choices:

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

Answers Choices:

3d

5p

4s

6d

Questions 49 of 50

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

Answers Choices:

Two fold degenerate

Non degenerate

Three fold degenerate

None of these