This AIEEE chemistry sample paper consists of atomic structure questions which are part of the AIEEE Chemistry section.

Chemistry Sample Questions

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Question

The size of nucleus is of the order of

Possible Answers

Selected	Possible Answer
	$10^{-10} m$
	$10^{-15} m$
	$10^{-8} m$
	$10^{-12} m$

Question

The ratio of charge and mass would be greater for

Possible Answers

Selected	Possible Answer
	Neutron
	Electron
	Proton
	Alpha

Question

The radius of an atom is of the order of

Possible Answers

Selected	Possible Answer
	$10^{-10 cm}$
	$10^{-8} cm$
	$10^{-13 cm}$

Question

Which one of the following pairs is not correctly matched

Possible Answers

Selected	Possible Answer
	J.J.Thomson-Electron
	Bohr- Isotope
	Rutherford-Proton
	J.H.Chadwick-Neutron

Question

Proton was discovered by

Possible Answers

Selected	Possible Answer
	Thomson
	Bohr
	Goldstein
	Chadwick

Question

The average distance of an electron in an atom from its nucleus is of the order of

Possible Answers

Selected	Possible Answer
	$10^{-10} m$
	$10^{-6} m$
	$10^{-15} m$

Question

The ratio of specific charge of a proton and an α-particle is

Possible Answers

Selected	Possible Answer
	1 : 1
	1 : 2
	2 : 1
	1 : 4

Question

Which of the following are isoelectronic with one another

Possible Answers

Selected	Possible Answer
	and
	and
	and
	and

Question

The number of electrons in one molecule of CO_2 are

Possible Answers

Selected	Possible Answer
	44
	66
	88
	22

Question

An atom has 26 electrons and its atomic weight is 56. The number of neutrons in the nucleus of the atom will be

Possible Answers

Selected	Possible Answer
	56
	36
	26
	30

Question

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

Possible Answers

Selected	Possible Answer
	45 and 35
	35 and 45
	30 and 50
	40 and 40

Question

Which of the following particles has more electrons than neutrons

Possible Answers

Selected	Possible Answer
	$F^{-}$
	$O^{-2}$

	$Al^{+3}$

Question

$Na^{+}$ ion is isoelectronic with

Possible Answers

Selected	Possible Answer
	$Li^{+}$
	$Ba^{+2}$
	$Mg^{+2}$
	$Ca^{+2}$

Question

Which of the following oxides of nitrogen is isoelectronic with CO_2

Possible Answers

Selected	Possible Answer

Question

Which of the following are isoelectronic species I = CH_3 ^+ , II = NH_2 , III = NH_4 ^+ , IV = NH_3

Possible Answers

Selected	Possible Answer
	I and II
	II, III, IV
	I, II, IV
	I, II, III

Question

Number of unpaired electrons in inert gas is

Possible Answers

Selected	Possible Answer
	4
	8
	0
	18

Question

Which one of the following is not isoelectronic with $O^{2 -}$

Possible Answers

Selected	Possible Answer
	$F^{-}$
	$Na^{+}$
	$N3^{-}$
	$Ti^{+}$

Question

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

Possible Answers

Selected	Possible Answer
	4
	2
	8
	16

Question

The atomic mass of an element is 12.00719 amu. If there are 6 neutrons in the nucleus of the atom of the element, the binding energy per nucleon of the nucleus will be

Possible Answers

Selected	Possible Answer
	76.4 MeV
	7.64 MeV
	0.764 MeV
	764 MeV

Question

The number of neutron in tritium is

Possible Answers

Selected	Possible Answer
	9
	3
	2
	1

Question

The hydride ions (H–) are isoelectronic with

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Selected	Possible Answer

Question

Bohr’s model can explain

Possible Answers

Selected	Possible Answer
	The spectrum of hydrogen molecule
	The solar spectrum
	Spectrum of atom or ion containing one electron only
	The spectrum of hydrogen atom only

Question

When an electron jumps from L to K shell

Possible Answers

Selected	Possible Answer
	Energy is neither absorbed nor released
	Energy is absorbed
	Energy is sometimes absorbed and sometimes released
	Energy is released

Question

When an electron jumps from lower to higher orbit, its energy

Possible Answers

Selected	Possible Answer
	Remains the same
	None of these
	Decreases
	Increases

Question

The energy of second Bohr orbit of the hydrogen atom is $-328kJ\, mol^{-1}$ , hence the energy of fourth Bohr orbit would be

Possible Answers

Selected	Possible Answer
	$mol^{-1}$
	$mol^{-1}$
	$mol^{-1}$
	$mol^{-1}$

Question

If wavelength of photon is $2.2 * 10^{-11} m$ , $h = 6.6 * 10^{-34}$ J-sec, then momentum of photon is

Possible Answers

Selected	Possible Answer
	$3.33 * 10^{22} kg$ $ms^{-1}$
	$6.89 * 10^{43} kg$ $ms^{-1}$
	$3 * 10^{-23} kg$ $ms^{-1}$
	$1.452 * 10^{-44} kg ms^{-1}$

Question

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

Possible Answers

Selected	Possible Answer
	1.9 eV
	10.2 eV
	0.65 eV
	12.09 eV

Question

The specific charge of proton is 9.6 * 10^6 $\operatorname{C} kg^{-1}$ then for an $\alpha$ -particle it will be

Possible Answers

Selected	Possible Answer
	$\operatorname{C} kg^{-1}$
	$\operatorname{C} kg^{-1}$
	$\operatorname{ C} kg^{-1}$
	$\operatorname{C} kg^{-1}$

Question

Radius of the first Bohr’s orbit of hydrogen atom is

Possible Answers

Selected	Possible Answer
	$\operatorname{0.22} \overset{\circ}{A}$
	$\operatorname{1.06} \overset{\circ}{A}$
	$\operatorname{0.53} \overset{\circ}{A}$
	$\operatorname{0.28} \overset{\circ}{A}$

Question

Energy of electron of hydrogen atom in second Bohr orbit is

Possible Answers

Selected	Possible Answer
	$- 5.44 * 10^{-19} J$
	$- 5.44 * 10^{-19} eV$
	$- 5.44 * 10^{-19} cal$
	$- 5.44 * 10^{-19} kJ$

Question

The radius of first Bohr’s orbit for hydrogen is $0.53 \overset{\circ} {A}$ . The radius of third Bohr’s orbit would be

Possible Answers

Selected	Possible Answer
	$\operatorname{4.77} \overset{\circ}{A}$
	$\operatorname{0.79} \overset{\circ}{A}$
	$\operatorname{1.59} \overset{\circ}{A}$
	$\operatorname{3.18} \overset{\circ}{A}$

Question

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

Possible Answers

Selected	Possible Answer

Question

Which of the following is not true in Rutherford’s nuclear model of atom

Possible Answers

Selected	Possible Answer
	The number of electrons and protons are always equal
	Protons and neutrons are present inside nucleus
	The number of protons and neutrons are always equal
	Volume of nucleus is very small as compared to volume of atom

Question

Ratio of radii of second and first Bohr orbits of H atom

Possible Answers

Selected	Possible Answer
	4
	3
	2
	5

Question

The energy of the electron in the first orbit of He+ is $- 871.6 * 10^{-20} J$ . The energy of the electron in the first orbit of hydrogen would be

Possible Answers

Selected	Possible Answer
	$- 871.6 * 10^{-20} J$
	$- 108.9 * 10^{-20} J$
	$- 217.9 * 10^{-20} J$
	$- 435.8 * 10^{-20} J$

Question

The Bohr orbit radius for the hydrogen atom (n = 1) is approximately $0.530 \overset{\circ} {A}$ . The radius for the first excited state (n = 2) orbit is

Possible Answers

Selected	Possible Answer
	$\operatorname{4.77} \overset{\circ}{A}$
	$\operatorname{2.12} \overset{\circ}{A}$
	$\operatorname{0.13} \overset{\circ}{A}$
	$\operatorname{1.06} \overset{\circ}{A}$

Question

In case of hydrogen atom when electron falls from higher level to M shell, the corresponding spectral line will form the part of

Possible Answers

Selected	Possible Answer
	Lyman series
	Balmer series
	Pfund series
	Paschen series

Question

The velocity of an electron on 1, 2 and 3rd orbit of hydrogen atom is given respectively as V_1 , V_2 , V_3 . They maintain the order

Possible Answers

Selected	Possible Answer

Question

I.P. of hydrogen atom is equal to 13.6 eV. What is the energy required for the process :
He^+ + energy

$\rightarrow He^{+2} + e$

Possible Answers

Selected	Possible Answer
	None of these

Question

$E_1, E_2, E_3 \And E_4$ respectively are the energies of the first line of Lyman, Balmer, Paschen and Brackett series. The decreasing order of their energy is

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Selected	Possible Answer

Question

If x is the velocity of an electron in first Bhor’s orbit. What would be the velocity of the electron in third Bhor’s orbit ?

Possible Answers

Selected	Possible Answer

Question

What should be the maximum number of lines obtained in the spectrum, if total number of energy levels are four ?

Possible Answers

Selected	Possible Answer
	3
	2
	4
	6

Question

Which of the following transitions in hydrogen atom should emit a radiation of highest frequency ?

Possible Answers

Selected	Possible Answer
	n = 3 to n = 2 Balmer
	n = 4 to n = 2 Balmer
	n = 3 to n = 1 Lymen
	n = 5 to n = 2 Balmer

Question

Which of the following should be the correct value of the wave number of first line in Balmer Series of hydrogen atom ?

Possible Answers

Selected	Possible Answer

Question

What should be the value of wave number of the radiation produced when electron jumps from the second orbit to first orbit in hydrogen atom ?

Possible Answers

Selected	Possible Answer
	$3200 cm^{-1}$
	$52276 cm^{-1}$
	$83376 cm^{-1}$
	$82276 cm^{-1}$

Question

What should be the quantum number of the highest energy state when an electron falls from the highest energy state to Lymen Series and for this transition the wave number will be = $97492.2 cm^{-1}$ ?

Possible Answers

Selected	Possible Answer
	3
	4
	5
	2

Question

What is the de-broglie wavelength associated with the hydrogen electron in its third orbit

Possible Answers

Selected	Possible Answer
	$9.96 * 10^{-10} cm$


	$9.96 * 10^{-8} cm$

Question

Which one is not the correct relation in the following

Possible Answers

Selected	Possible Answer

	$\Delta x * \Delta \rho = h/4\pi$
	$\lambda = h/mv$

Question

The uncertainty in momentum of an electron is $1 * 10^{-5} kg - m/s.$ The uncertainty in its position will be $(h = 6.62 * 10^{-34} kg$ -m^2/s)

Possible Answers

Selected	Possible Answer
	$5.27 * 10^{-30} m$
	$1.05 * 10^{-28} m$
	$1.05 * 10^{-26} m$
	$5.25 * 10^{-28} m$

Question

The uncertainty in the position of a moving bullet of mass 10 gm is $10^{-5} m$ . Calculate the uncertainty in its velocity

Possible Answers

Selected	Possible Answer
	$5.2 * 10^{-28} m/sec$
	$3.0 * 10^{-28} m/sec$
	$5.2 * 10^{-22} m/sec$
	$3 * 10^{-22} m/sec$

Question

The ratio of energy of photons having wavelength 2000 $\overset{\circ}{A}$ and 4000 $\overset{\circ}{A}$ respectively would be

Possible Answers

Selected	Possible Answer
	1/2
	2
	1/4
	4

Question

Helium atom is twice as heavy as hydrogen molecule. At 298 K the average kinetic energy of helium atom would be

Possible Answers

Selected	Possible Answer
	Thrice that of hydrogen molecule
	Equal to that of hydrogen molecule
	Four times that of hydrogen molecule
	Twice that of hydrogen molecule

Question

K.E. of the electron is $4.55 * 10^{-25} J$ . Its de Broglie wave length is

Possible Answers

Selected	Possible Answer
	$\operatorname{4700} \overset{\circ}{A}$
	$\operatorname{8300} \overset{\circ}{A}$
	$\operatorname{7200} \overset{\circ}{A}$
	$\operatorname{7400} \overset{\circ}{A}$

Question

Nitrogen has the electronic configuration $1s^2, 2s^2 \;2p_x ^1\; 2p_y ^1 \;2p_z ^1$ and not $1s^2, 2s^2\; 2p_x ^2 \; 2p_y ^1\; 2p_z ^0$ which is determined by

Possible Answers

Selected	Possible Answer
	uncertainty principle
	Aufbau’s principle
	Hund’s rule
	Pauli’s exclusion principle

Question

2p orbitals have

Possible Answers

Selected	Possible Answer
	n = 2, l = 0
	n = 1, l = 0
	n = 1, l = 2
	n = 2, l = 1

Question

An element has the electronic configuration $1s^2, 2s^2\; 2p^6, 3s^2\; 3p^2$ . Its valency electrons are

Possible Answers

Selected	Possible Answer
	3
	4
	2
	6

Question

Which of the following sets of quantum numbers represent an impossible arrangement

Possible Answers

Selected	Possible Answer
	$n=3, l=2, m= -3, m_s=(+)\frac{1}{2}$
	$n=3, l=2, m= -2, m_s=(+)\frac{1}{2}$
	$n=4, l=0, m= 0, m_s=(-)\frac{1}{2}$
	$n=5, l=3, m= 0, m_s=(-)\frac{1}{2}$

Question

Which one is the correct outer configuration of chromium

Possible Answers

Selected	Possible Answer

Question

The electronic configuration of calcium ion $(Ca^{2+})$ is

Possible Answers

Selected	Possible Answer
	$1s^2, 2s^2\; 2p^6, 3s^2\: 3p^6, 4s^2$
	$1s^2, 2s^2\: 2p^6, 3s^2\: 3p^6, 4s^1$
	$1s^2, 2s^2\: 2p^6, 3s^2 \: 3p^6 \: 3d^2$
	$1s^2, 2s^2\: 2p^6, 3s^2\: 3p^6, 4s^0$

Question

The structure of external most shell of inert gases is

Possible Answers

Selected	Possible Answer



	$d^{10}s^2$

Question

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

Possible Answers

Selected	Possible Answer
	4
	12
	16
	8

Question

Which set of quantum numbers are not possible from the following

Possible Answers

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

Question

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

Possible Answers

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

Question

Which electronic configuration for oxygen is correct according to Hund’s rule of multiplicity

Possible Answers

Selected	Possible Answer
	$1s^2 , 2s^2\; 2p_x ^2\; 2p_y ^1\; 2p_z ^1$
	$1s^2 , 2s^2 \;2p_x ^2\; 2p_y ^2 \;2p_z ^0$
	$1s^2 , 2s^2\; 2p_x ^3 \;2p_y ^1\; 2p_z ^0$
	None of these

Question

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

Possible Answers

Selected	Possible Answer
	$1s^2, 2s^2\; 2p^6, 3s^2 \;3p^6 \;3d^7, 4s^2$
	$1s^2, 2s^2 \;2p^6,3s2 \;3p^6\; 3d^1, 4s2$
	$1s^2, 2s^2 2p^6,3s^2\; 3p^6 \;3d^5, 4s^1$
	$1s^2, 2s^2 \;2p^6,3s^2 \;3p^6\; 3d^8, 4s^2$

Question

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

Possible Answers

Selected	Possible Answer
	4s < 3p
	4s > 3d
	4s < 3d
	4s > 4p

Question

How many electrons can be accommodated in a sub-shell for which n = 3, l = 1

Possible Answers

Selected	Possible Answer
	32
	6
	8
	18

Question

Azimuthal quantum number for last electron of Na atom is

Possible Answers

Selected	Possible Answer
	3
	2
	1
	0

Question

Which of the following set of quantum numbers belong to highest energy

Possible Answers

Selected	Possible Answer
	$n = 3, l = 2, m = 1, s = + \frac{1}{2}$
	$n = 3, l = 1, m = 1, s = + \frac{1}{2}$
	$n = 4, l=0, m = 0, s= +\frac{1}{2}$
	$n = 3, l = 0, m = 0, s = +\frac{1}{2}$

Question

Which of the following sets of quantum numbers is not allowed

Possible Answers

Selected	Possible Answer
	$n = 2, l = 1, m = 1, s =+\frac{1}{2}$
	$n = 1, l = 1, m = 0, s = -\frac{1}{2}$
	$n = 1, l = 0, m = 0, s = + \frac{1}{2}$
	$n = 2, l = 1, m = 0, s =-\frac{1}{2}$

Question

Which of the following has maximum energy

Possible Answers

Selected	Possible Answer

Question

Correct statement is

Possible Answers

Selected	Possible Answer
	$K = 4s^2, Cr = 3d^4 4s^2, Cu = 3d^{10} 4s^2$
	$K = 4s^1, Cr = 3d^4 4s^2, Cu = 3d^{10} 4s^2$
	$K = 4s^1, Cr = 3d^5 4s^1, Cu = 3d^{10} 4s^1$
	$K = 4s^2, Cr = 3d^5 4s^1, Cu = 3d^{10} 4s^2$

Question

The number of unpaired electrons in an O_2 molecule is

Possible Answers

Selected	Possible Answer
	1
	2
	0
	3

Question

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

Possible Answers

Selected	Possible Answer
	2
	1
	4
	3

Question

Which of the following has the least energy

Possible Answers

Selected	Possible Answer
	3p
	2p
	2s
	4d

Question

The correct order of increasing energy of atomic orbitals is

Possible Answers

Selected	Possible Answer

Question

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

Possible Answers

Selected	Possible Answer

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

Question

If the values of (n + l) is not > 3 , then the maximum number of electrons in all the orbitals would be

Possible Answers

Selected	Possible Answer
	12
	10
	6
	2

Question

Given : $Orbital - A \quad \quad Orbital - B$

$. \quad \quad n = 3, l = 2 \quad \quad n = 5, l = 0$
The order of their energies would be

Possible Answers

Selected	Possible Answer
	A = B
	B > A
	A > B
	None of these

Question

Quantum numbers of 13th electron of silicon (Z = 14) are 3, 1, 1, +1/2. Which one of the following is true set of quantum numbers for the 14th electron ?

Possible Answers

Selected	Possible Answer

Question

Using hund’s rule to decide which of the following is not the ground state electronic configuration

Possible Answers

Selected	Possible Answer

Question

What are the chances that the electron in a hydrogen atom has a spin quantum number of $+\frac{1}{2}$

Possible Answers

Selected	Possible Answer
	100%
	25%
	50%
	0%

Question

Which species shows the electronic configuration 1s^2, 2s^2, 2p^5, 3s^2 ?

Possible Answers

Selected	Possible Answer
	$Al^{+2}$ (Ground state)
	$Na^{+}$ (Excited state)
	$Mg^{+}$ (Excited state)
	(Ground state)

Question

If n and l are respectively the principal and azimuthal quantum numbers, then the expression for calculating the total number of electrons in any energy level is

Possible Answers

Selected	Possible Answer
	$\overset{n=l)}{\underset{l=0}{\sum}} 2(2l+1)$
	$\overset{l=(n-1)}{\underset{l=1}{\sum}} 2(2l+1)$
	$\overset{l=(n+1)}{\underset{l=0}{\sum}} 2(2l+1)$
	$\overset{l=(n-1)}{\underset{l=0}{\sum}} 2(2l+1)$

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