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Learnhub / jee / Tests / Online-IIT-2011-Tests-Atomic-Structure-Practice-2

Students in India who have filled IIT JEE 2011 application form should practice lot of IIT 2011 practice tests. It is important to analyze each tests and plan out a strategy for IIT mains preparation. One should also solve subject wise IIT JEE 2011 tests.

Practice here IIT 2011 tests for atomic structure.

All questions are of objective type (multiple choice questions); each question with choice of four answers..
Each correct answer fetches 4 mark, while each incorrect answer has a penalty of 1 mark. .

Online IIT 2011 Tests - Atomic Structure Practice # 2

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Question

If x is the velocity of an electron in first Bhorâ€™s orbit. What would be the velocity of the electron in third Bhorâ€™s orbit ?

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Selected	Possible Answer

Question

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

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Selected	Possible Answer
	6
	3
	4
	2

Question

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

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Selected	Possible Answer
	n = 4 to n = 2 Balmer
	n = 3 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 ?

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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 ?

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

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 = $97492.2 cm^{-1}$ ?

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Selected	Possible Answer
	5
	3
	4
	2

Question

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

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Selected	Possible Answer


	$9.96 * 10^{-8} cm$
	$9.96 * 10^{-10} cm$

Question

Which one is not the correct relation in the following

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

Question

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

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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

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Selected	Possible Answer
	1/4
	4
	1/2
	2

Question

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

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Selected	Possible Answer
	Four times that of hydrogen molecule
	Thrice that of hydrogen molecule
	Twice that of hydrogen molecule
	Equal to 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
	$\operatorname{7400} \overset{\circ}{A}$
	$\operatorname{7200} \overset{\circ}{A}$
	$\operatorname{8300} \overset{\circ}{A}$
	$\operatorname{4700} \overset{\circ}{A}$

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
	Hundâ€™s rule
	Aufbauâ€™s principle
	uncertainty principle
	Pauliâ€™s exclusion principle

Question

2p orbitals have

Possible Answers

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

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
	6
	2
	4

Question

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

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

Question

Which one is the correct outer configuration of chromium

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Selected	Possible Answer

Question

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

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

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
	8
	12
	16
	4

Question

Which set of quantum numbers are not possible from the following

Possible Answers

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

Question

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

Possible Answers

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

Question

Which electronic configuration for oxygen is correct according to Hundâ€™s rule of multiplicity

Possible Answers

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

Question

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

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

Question

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

Possible Answers

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

Question

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

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Selected	Possible Answer
	6
	32
	8
	18

Question

Azimuthal quantum number for last electron of Na atom is

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Selected	Possible Answer
	1
	3
	2
	0

Question

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

Possible Answers

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

Question

Which of the following sets of quantum numbers is not allowed

Possible Answers

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

Question

Which of the following has maximum energy

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Selected	Possible Answer

Question

Correct statement is

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

Question

The number of unpaired electrons in an O_2 molecule is

Possible Answers

Selected	Possible Answer
	0
	3
	2
	1

Question

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

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Selected	Possible Answer
	2
	3
	4
	1

Question

Which of the following has the least energy

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Selected	Possible Answer
	2s
	4d
	3p
	2p

Question

The correct order of increasing energy of atomic orbitals is

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Question

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

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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
	6
	10
	12
	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

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Selected	Possible Answer
	A > B
	A = B
	B > A
	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 ?

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