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31 Year NEET Previous Year Questions: Structure of Atom - 1 - NEET MCQ


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30 Questions MCQ Test - 31 Year NEET Previous Year Questions: Structure of Atom - 1

31 Year NEET Previous Year Questions: Structure of Atom - 1 for NEET 2024 is part of NEET preparation. The 31 Year NEET Previous Year Questions: Structure of Atom - 1 questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Structure of Atom - 1 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Structure of Atom - 1 below.
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31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 1
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The following quantum numbers are possible for how many orbital (s) n = 3, l = 2, m = +2 ? [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 1

Correct Answer is A.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 2
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Which of the following is isoelectronic? [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 2

Both CN– and CO have 14 electrons

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31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 3
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In hydrogen atom, energy of first excited state is –3.4 eV. Find out KE of the same orbit of Hydrogen atom [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 3

Suppose the nucleus of hydrogen atom have charge of one proton i.e. The electron revolves in a radius of r around it. Therefore the centripital force is supplied by electrostatic force of attraction i.e.

now total energy (En) = K.E + P.E in first excited state

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 4
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The value of Planck's constant is 6.63 × 10–34 Js.The velocity of light is 3.0 × 108 m s–1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 × 1015 s–1 ? [2003]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 4

In nanometer λ = 3.75× 10 which is closest to 4 × 101

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 5
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The ions O2–, F–, Na+, Mg2+ and Al3+ are isoelectronic. Their ionic radii show [2003]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 5

Amongst isoelectronic species, ionic radii of anion is more than that of cations. Further size of anion increase with increase in-ve change and size of cation decrease with increase in + ve charge. Hence ionic radii decreases from O– to Al+++.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 6
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The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given ionization energy of H=2.18 ×10–18J atom–1and h = 6.625 × 10–34 J s ) [2004]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 6

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 7
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The energy of the second Bohr orbit of the hydrogen atom is -328 kJ mol-1; hence the energy of the fourth Bohr orbit would be: [2005]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 7

We know that

Given 

 –82 kJmol–1

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 8
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Given : The mass of electron is 9.11 × 10–31 kg Plank constant is 6.626 × 10–34 Js, the uncertainty involved in the measurement of velocity within a distance of 0.1 Å is [2006]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 8

We know that  

 5.79 x106 m/sec

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 9
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The orientation of an atomic orbital is governed by [2006]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 9

Magnetic quantum no. represents the orientation of atomic orbitals in an atom. For example px, py & pz have orientation along X-axis, Y-axis & Z-axis

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 10
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Consider the following sets of quantum numbers:

Which of the following sets of quantum number is not possible? [2007]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 10

(ii) is not possible for any value of n because l varies from 0 to (n – 1) thus for n = 2, l can be only 0, 1, 2. (iv) is not possible because for l = 0, m = 0. (v) is not possible because for l = 2, m varies from –2 to +2.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 11
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If uncertainty in position and momentum are equal, then uncertainty in velocity is : [2008]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 11

We know 

               [∵ Δp= mΔv]

since Δp = Δx (given)

Thus option (a) is the correct option.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 12
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The measurement of the electron position if associated with an uncertainty in momentum, which is equal to 1 × 10–18 g cm s– 1 . The uncertainty in electron velocity is? (mass of an electron is 9 × 10– 28 g) 
[2008]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 12

Δp = mΔv Substituting the given values of Δx and m, we get 1×10–18 gcms–1 = 9×10–28g × Δv

i.e. option (a) is correct.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 13
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The energy absorbed by each molecule (A2) of a substance is 4.4 × 10–19 J and bond energy per molecule is 4.0 × 10–19 J. The kinetic energy of the molecule per atom will be: [2009]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 13

K.E per atom

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 14
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Maximum number of electrons in a subshell of an atom is determined by the following: [2009]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 14

The number of sub shell is (2 l + 1). The maximum number of electrons in the sub shell is 2 (2 l + 1) = (4 l + 2)

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 15
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Wh ich of the followin g is not per missible arrangement of electrons in an atom? [2009]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 15

m = 2 l +1, thus for l  = 2, m = 5, hence values of m will be – 2, –1, 0, + 1, + 2.
Therefore for l = 2, m cannot have the value– 3.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 16
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The electronic configuration for oxygen is written as 1s22s22p4. Which rule will this configuration be violating?
31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 17
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Which one of the following species does not exist under normal conditions? [2010]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 17

Bond order of Be2 = 0, hence Be2 cannot exist.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 18
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A 0.66 kg ball is moving with a speed of 100 m/s.The associated wavelength will bexh (6.6x10-34 Js) : [2010]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 18

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 19
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The total number of atomic orbitals in fourth energy level of an atom is : [2011]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 19

Total no. of atomic orbital in a shell = n2.
Given n = 4; Hence number of atomic orbitals in 4th shell will be 16.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 20
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Which of the following has the minimum bond length ? [2011]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 20

Since, the bond length decreases as the bond order increases, hence, O2+ have least bond length.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 21
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The energies E1 and E2 of two radiations are 25 eV and 50 eV, respectively. The relation between their wavelengths i.e., λ1 and λ2 will be :[2011]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 21

Given E1 = 25eV E2 = 50 eV

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 22
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If n = 6, the correct sequence for filling of electrons will be : [2011]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 22

ns → (n - 2)f → (n - 1)d → np [n = 6]

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 23
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According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon ? [2011 M]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 23

Energy of photon obtained from the transition n = 6 to n = 5 will have least energy.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 24
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The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description? [2011 M]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 24

MOT configurations of O2 and O2+ :

Number of unpaired electrons = 2, so paramagnetic.

O2 : (σ1s)2 (σ*1s)2 (σ2s)2 (σ*2s)2 (σ2pz)2

Number of unpaired electrons = 1, so paramagnetic.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 25
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Maximum number of electrons in a subshell with : l = 3 and n = 4 is : [2012]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 25

(n = 4, l = 3) ⇒  4f subshell Since, maximum no. of electrons in a subshell = 2(2l + 1)
So, total no. of electron in 4f subshell = 2 (2 × 3 + 1) = 14 electrons.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 26
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The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is [2012]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 26

Electronic configuration of  Rb = [Kr] 5s–1 Set of quantum numbers,  n = 5
ℓ = 0, ∴ s orbital  m  =  0, s = + 1/2

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 27
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The orbital angular momentum of a p-electron is given as : [2012 M]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 27

Orbital angular momentum

For p orbital ℓ = 1

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 28
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The value of Planck’s constant is 6.63 × 10–34 Js.The speed of light is 3 × 1017 nm s–1.. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 × 1015 s–1? [NEET 2013]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 28

C = νλ

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 29
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What is the maximum numbers of electrons that can be associated with the following set of quantum numbers? n = 3, l = 1 and m = –1 [NEET 2013]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 29

n = 3 → 3rd shell
l = 1 → p sub shell.
m = – 1 is possible for two electrons present in an orbital.

31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 30
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Based on equation certain conclusions are written. Which of them is not correct ? [NEET 2013]
Detailed Solution for 31 Year NEET Previous Year Questions: Structure of Atom - 1 - Question 30

Energy of an electron at infinite distance from the nucleus is zero. As an electron approaches the nucleus, the electron attraction increases and hence the energy of electron decreases and thus becomes negative. Thus as the value of n decreases, i.e. lower the orbit is, more negative is the energy of the electron in it.

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