# Atomic Structure Test 5

Total Questions:50 Total Time: 60 Min

Remaining:

## Questions 1 of 50

Question:An elementary particle is

An element present in a compound

An atom present in an element

A sub-atomic particle

A fragment of an atom

## Questions 2 of 50

Question:The mass of a mol of proton and electron is

$$6.023 \times {10^{23}}g$$

$$1.008g$$ and $$0.55mg$$

$$9.1 \times {10^{ - 28}}kg$$

$$2gm$$

## Questions 3 of 50

Question:$$CO$$ has same electrons as or the ion that is isoelectronic with $$CO$$ is

$$N_2^ +$$

$$C{N^ - }$$

$$O_2^ +$$

$$O_2^ -$$

## Questions 4 of 50

Question:Pick out the isoelectronic structures from the following $$\mathop {CH_3^ + }\limits_{\rm{I}}$$ $$\mathop {{H_3}{O^ + }}\limits_{II}$$ $$\mathop {N{H_3}}\limits_{{\rm{III}}}$$ $$\mathop {CH_3^ - }\limits_{{\rm{IV}}}$$

I and II

I and IV

I and III

II, III and IV

## Questions 5 of 50

Question:Neutrons are found in atoms of all elements except in

Chlorine

Oxygen

Argon

Hydrogen

## Questions 6 of 50

Question:The mass number of an anion, $${X^{3 - }}$$, is 14. If there are ten electrons in the anion, the number of neutrons in the nucleus of atom, $${X_2}$$ of the element will be

10

14

7

5

## Questions 7 of 50

Question:The atomic number of an element is 17. The number of orbitals containing electron pairs in its valence shell is

Eight

Six

Three

Two

## Questions 8 of 50

Question:The atomic number of an element is 35 and mass number is 81. The number of electrons in the outer most shell is

7

6

5

3

## Questions 9 of 50

Question:Six protons are found in the nucleus of

Boron

Lithium

Carbon

Helium

## Questions 10 of 50

Question:The nitrogen atom has 7 protons and 7 electrons, the nitride ion $$({N^{3 - }})$$will have

7 protons and 10 electrons

4 protons and 7 electrons

4 protons and 10 electrons

10 protons and 7 electrons

## Questions 11 of 50

Question:Bohr model of an atom could not account for

Emission spectrum

Absorption spectrum

Line spectrum of hydrogen

Fine spectrum

## Questions 12 of 50

Question:Existence of positively charged nucleus was established by

Positive ray analysis

$$\alpha$$-ray scattering experiments

X-ray analysis

Discharge tube experiments

## Questions 13 of 50

Question:The energy of an electron in $${n^{th}}$$ orbit of hydrogen atom is

$$\frac{{13.6}}{{{n^4}}}eV$$

$$\frac{{13.6}}{{{n^3}}}eV$$

$$\frac{{13.6}}{{{n^2}}}eV$$

$$\frac{{13.6}}{n}eV$$

## Questions 14 of 50

Question:If wavelength of photon is$${X^{3 - }}$$$$h = 6.6 \times {10^{ - 34}}$$J-sec, then momentum of photon is

$$3 \times {10^{ - 23}}kg\,m{s^{ - 1}}$$

$$3.33 \times {10^{22}}kg\,m{s^{ - 1}}$$

$$1.452 \times {10^{ - 44}}\,kg\,m{s^{ - 1}}$$

$$6.89 \times {10^{43}}\,kg\,m{s^{ - 1}}$$

## Questions 15 of 50

Question:Which one of the following is considered as the main postulate of Bohrâ€™s model of atom

Protons are present in the nucleus

Electrons are revolving around the nucleus

Centrifugal force produced due to the revolving electrons balances the force of attraction between the electron and the protons

Angular momentum of electron is an integral multiple of $$\frac{h}{{2\pi }}$$

## Questions 16 of 50

Question:The electronic energy levels of the hydrogen atom in the Bohrâ€™s theory are called

Rydberg levels

Orbits

Ground states

Orbitals

## Questions 17 of 50

Question:Which of the following is not true in Rutherfordâ€™s nuclear model of atom

Protons and neutrons are present inside nucleus

Volume of nucleus is very small as compared to volume of atom

The number of protons and neutrons are always equal

The number of electrons and protons are always equal

## Questions 18 of 50

Question:The emission spectrum of hydrogen is found to satisfy the expression for the energy change. $$\Delta E$$ (in joules) such that $$\Delta E = 2.18 \times 10\left( {\frac{1}{{n_1^2}} - \frac{1}{{n_2^2}}} \right)\,\,J$$ where $${n_1}$$ = 1, 2, 3â€¦.. and $${n_2}$$ = 2, 3, 4â€¦â€¦. The spectral lines correspond to Paschen series to

$${n_1} = 1$$ and $${n_2} = 2,\,\,3,\,\,4$$

$${n_1} = 3$$ and $${n_2} = 4,\,\,5,\,\,6$$

$${n_1} = 1$$ and $${n_2} = 3,\,\,4,\,\,5$$

$${n_1} = 2$$ and $${n_2} = 3,\,\,3,\,\,5$$

## Questions 19 of 50

Question:The ionisation potential of a hydrogen atom is â€“13.6 eV. What will be the energy of the atom corresponding to $$n = 2$$

3.4 eV

6.8 eV

1.7 eV

2.7 eV

## Questions 20 of 50

Question:The energy of electron in hydrogen atom in its grounds state is â€“13.6 eV. The energy of the level corresponding to the quantum number equal to 5 is

0.54 eV

0.85 eV

0.64 eV

0.40 eV

## Questions 21 of 50

Question:The de-Broglie wavelength associated with a particle of mass $${10^{ - 6}}kg$$ moving with a velocity of $$10\,\,m{s^{ - 1}}$$, is

$$6.63 \times {10^{ - 22}}m$$

$$6.63 \times {10^{ - 29}}\,m$$

$$6.63 \times {10^{ - 31}}\,m$$

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

## Questions 22 of 50

Question:What is the de-Broglie wavelength associated with the hydrogen electron in its third orbit

$$9.96 \times {10^{ - 10}}cm$$

$$9.96 \times {10^{ - 8}}cm$$

$$9.96 \times {10^4}cm$$

$$9.96 \times {10^8}cm$$

## Questions 23 of 50

Question:If uncertainty in the position of an electron is zero, the uncertainty in its momentum would be

Zero

$$< \frac{h}{{2\lambda }}$$

$$> \frac{h}{{2\lambda }}$$

Infinite

## Questions 24 of 50

Question:The possibility of finding an electron in an orbital was conceived by

Rutherford

Bohr

Heisenberg

Schrodinger

## Questions 25 of 50

Question:Nitrogen has the electronic configuration $$1{s^2},2{s^2}2p_x^12p_y^12p_z^1$$ and not $$1{s^2},2{s^2}2p_x^22p_y^12p_z^0$$ which is determined by

Aufbau's principle

Pauli's exclusion principle

Hund's rule

Uncertainty principle

## Questions 26 of 50

Question:Which one of the following configuration represents a noble gas

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

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

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

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

## Questions 27 of 50

Question:The magnetic quantum number for an electron when the value of principal quantum number is 2 can have

3 values

2 values

9 values

6 values

## Questions 28 of 50

Question:The following has zero valency

Sodium

Beryllium

Aluminium

Krypton

## Questions 29 of 50

Question:The maximum energy is present in any electron at

Nucleus

Ground state

First excited state

Infinite distance from the nucleus

## Questions 30 of 50

Question:The electron density between $$1s$$and $$2s$$orbital is

High

Low

Zero

None of these

## Questions 31 of 50

Question:The number of orbitals in $$2p$$ sub-shell is

6

2

3

4

## Questions 32 of 50

Question:The number of orbitals in $$d$$ sub-shell is

1

3

5

7

## Questions 33 of 50

Question:When $$3d$$ orbital is complete, the new electron will enter the

$$4p$$-orbital

$$4f$$orbital

$$4s$$-orbital

$$4d$$-orbital

## Questions 34 of 50

Question:In a potassium atom, electronic energy levels are in the following order

$$4s > 3d$$

$$4s > 4p$$

$$4s < 3d$$

$$4s < 3p$$

## Questions 35 of 50

Question:The principal quantum number represents

Shape of an orbital

Distance of electron from nucleus

Number of electrons in an orbit

Number of orbitals in an orbit

## Questions 36 of 50

Question:When the azimuthal quantum number has a value of $$l = 1$$, the shape of the orbital is

Unsymmetrical

Spherically symmetrical

Dumb-bell

Complicated

## Questions 37 of 50

Question:The number of possible spatial orientations of an electron in an atom is given by its

Spin quantum number

Spin angular momentum

Magnetic quantum number

Orbital angular momentum

## Questions 38 of 50

Question:Which of the following sets of orbitals may degenerate

$$2s,\,2{p_x},\,2{p_y}$$

$$3s,\,3{p_x},3{d_{xy}}$$

$$1s,\,2s,\,3s$$

$$2{p_x},\,2{p_y},\,2{p_z}$$

## Questions 39 of 50

Question:Which of the following sets of quantum numbers is not allowed

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

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

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

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

## Questions 40 of 50

Question:The electronic configuration of gadolinium (atomic no. 64) is

$$[Xe]4{s^8}5{d^9}6{s^2}$$

$$[Xe]4{s^7}5{d^1}6{s^2}$$

$$[Xe]4{s^3}5{d^5}6{s^2}$$

$$[Xe]4{f^6}5{d^2}6{s^2}$$

## Questions 41 of 50

Question:The quantum numbers $$n = 2,\,\,l = 1$$ represent

1s orbital

2s orbital

2p orbital

3d orbital

## Questions 42 of 50

Question:The magnetic quantum number of valence electron of sodium (Na) is

3

2

1

0

## Questions 43 of 50

Question:Which of the following electronic configuration is not possible according to Hundâ€™s rule

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

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

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

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

$$1{s^2}2{s^2}2p_x^22p_y^12p_z^1$$

## Questions 44 of 50

Question:The ground state term symbol for an electronic state is governed by

Heisenbergâ€™s principle

Hundâ€™s rule

Aufbau principle

Pauli exclusion principle

## Questions 45 of 50

Question:Number of unpaired electrons in $$1{s^2}2{s^2}2{p^3}$$ is

2

0

3

1

## Questions 46 of 50

Question:Total number of unpaired electrons in an atom of atomic number 29 is

1

3

4

2

## Questions 47 of 50

Question:An atom has 2 electrons in K shell, 8 electrons in L shell and 6 electronsÂ  in M shell. The number of s-electrons present in that element is

6

5

7

10

## Questions 48 of 50

Question:The number of unpaired electrons in carbon atom in excited state is

One

Two

Three

Four

## Questions 49 of 50

Question:According to Aufbau's principle, which of the three $$4d,\,5p$$ and $$5s$$will be filled with electrons first

$$4d$$

$$5p$$

$$5s$$

$$4d$$ and $$5s$$ will be filled simultaneously

## Questions 50 of 50

Question:The orbital angular momentum of an electron in $$2s$$-orbital is

$$\frac{1}{2}\frac{h}{{2\pi }}$$
$$\frac{h}{{2\pi }}$$
$$\sqrt 2 \frac{h}{{2\pi }}$$