CBSE Class 11 Chemistry Chapter 2 Structure of Atom MCQs
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CBSE Class 11 Chemistry Chapter 2 Structure of Atom MCQs (Set A)
1. Find the largest frequency ,Out of X-rays, infrared rays, visible rays and microwaves.
(A) X-ray
Answer: X-ray
2. Potential energy of an electron is -3.02eV in hydrogen atom find, its kinetic energy will be
Answer:1.51 eV
3. In which of the following, maximum wavelength is emitted?
(A) 4 to 1 in H
Answer: 4 to 1 in H
4. Find the radius of 5th Bohr orbit in hydrogen atom is
(A) 34r0
(B)r0/5
(C) 25r0
(D)r0/25
Answer:25r0
5. Radius of 2nd shell of He+(where a0 –Bohr radius)
(A) 3a0
(B) a0
Answe:2a0
6. The velocity of electron moving in 3rd orbit of He+ is v. The velocity of electron moving in 2nd orbit of Li+2 is
Answer:9v/4
7. An electronic transition is inversely related to
Answer=.Energy levels difference involved in the transition
CBSE Class 11 Chemistry Chapter 2 Structure of Atom MCQs (Set B)
1. An electron is moving in 3rd orbit of Hydrogen atom. The frequency of moving electron is
Answer: 2.44 × 10^14 rps
2. For a microscopic object ∆x is zero then ∆v will be (According to Heisenberg’s principle)
(A) Zero
Answer:Infinite
3. If E1, E2 and E3 represent respectively the kinetic energies of an electron, particle and a proton, each having same de Broglie’s wavelength then
Answer:E1 >E3 >E2
4. With increasing principal quantum number, the energy difference between adjacent energy levels in atoms
Answer: Decrease
5. The total number of electrons in a 4d subshell are
Answer: 10
6. The total spin resulting from d9configuration is
(B) 2
Answer:1/2
7. The maximum number of electronspossible in subshell is equal to(A) 2l +1
(B) 2n2
Answer: 4l+2
CBSE Class 11 Chemistry Chapter 2 Structure of Atom MCQs (Set C)
1. Electronic energy is negative because
Answer:None
2. An electron jumps from lower orbit to higher orbit, when
Answer:Energy is absorbed
3. En = –313.6/n2 kcal/mole. If the value of E = –34.84 kcal/mole, to which value does ‘n’ correspond?
(A) 4
(B) 3
(C) 2
(D) 1
Answer:3
4. Zeeman effect refers to the
Answer:Spectral lines, Splitting in a magnetic field
5. Find particles ,momentum which has a de-Broglie wavelength of 0.1 nm is
Answer:6.62×10^-24 kg ms-1
6. The uncertainty in velocity of an electron present in the nucleus of diameter 10^–15m hypothetically should be approximately
Answer:10^11 m/s
7. The principal and azimuthal quantum number of electrons in 4f orbitals are
(B) 4, 4
(C) 4, 3
(D) 3, 4
Answer:4,3
CBSE Class 11 Chemistry Chapter 2 Structure of Atom MCQs (Set D)
1. How many 4f electrons can have spin quantum number -1/2 ?
(A) 5
(B) 7
(C) 8
(D) 10
Answer: 7
2. The set of quantum number is given ,find the possible numbers?
(A) n = 7, l = 2, m = 2, s = 2
(B) n = 9, l = 4, m =0, s = 12
(C) n = 3,l = 3, m = – 3, s = 12
(D) None
Answer: None
3. In the presence of magnetic field, the possible number of orientations for an orbital of azimuthal quantum number 3, is
Answer: Seven
4. Which of the following electronic level would allow the hydrogen to absorb a photon but not emit a photon?
(A) 3s
(B) 2p
(C) 2s
(D) 1s
Answer:1s
5. Which of the following transition will emit maximum energy in hydrogen atom?
(A) 4f → 2s
(B) 4d → 2p
(C) 4p → 2s
(D) All have same energy
Answer: All have same energy
6. In an atom, which has 2K, 8L, 18M and 2N electrons in the ground state. The total number of electrons having magnetic quantum number, m = 0 is
(B) 10
(C) 7
(D) 14
Answer:14
7. A p-orbital can accommodate upto
(B) Six electrons
(D) Eight electrons
Answer:Two Electron
8. The number of radial nodes in 4s and 3p orbitals are respectively
(B) 3, 1
(C) 2, 2
(D) 3,2
Answer: 3,1
CBSE Class 11 Chemistry Chapter 2 Structure of Atom MCQs (Set E)
1. Which of the following has maximum number of unpaired electrons?
(A) Mg2+
(B) Ti3+
(C) Fe2+
(D) Mn2+
Answer:Mn2+
2. Imagine that in any atom about 50% of the space is occupied by the atomic nucleus. Majority of the α- particles would be, if a silver foil is bombarded with alpha-particles
Answer:get scattered
3. With respect to the total volume of an atom is if ,The fraction of volume occupied by the nucleus
(b) 10^–5
(c) 10^–30
(d) 10^–10
Answer:10^-15
4. Find the distance of .closest approach will be if, Two particles A and B having same e/m ratio are projected towards silver nucleus in different experiments with the same speed. (a)for Both same
Answer: For both same
5. For proton and an α-particle ,Find the ratio of specific charge.
(a) 2 : 1
(b) 1 : 2
(c) 1 : 4
(d) 1 : 1
Answer:2 : 1
6. Values of e/m(charge/mass) are given, so Find the increasing order of values :
(a) e, p, n, α
Answer: n, a, p, e
7. α-particles are represented by :
(a) lithium atoms
(d) None of these
Answer:Helium nuclei
CBSE Class 11 Chemistry Chapter 2 Structure of Atom MCQs (Set F)
1. Two electrons in the same orbital may be identified with:
(A) n
(C) m
Answer=S
2. In an atom ,Maximum number of electrons in a subshell is determined by the following: (A) 2n2
(B) 4l + 2
(C)zero
Answer:4l + 2
3. In order to designate an orbital 𝑛 in an atom, the number of quantum number required are:
(A) 1
(B) 2
(C) 3
(D) 4
Answer: 3
4. For a given value of azimuthal quantum number 𝑙, the total number of values for the magnetic quantum number 𝑚 are given by: (A) 𝑙 + 1
(B) 2𝑙 + 1
(C) 2𝑙 + 2
(D) 𝑙 + 2
Answer:2l+1
5. Splitting of spherical lines when atoms are subjected to strong electric field is called:
(A) Zeeman effect
(C) Decay
Answer: Stark effect
6. With a principal quantum number 5 , the maximum maximum number of atomic orbitals associated?
(A) 9
(B) 12
(C) 16
(D) 25
Answer: 25
7.The number of orbitals present in the shell with 𝑛 = 4 is
(B) 8
(C) 18
(D) 32
Answer: 16
CBSE Class 11 Chemistry Chapter 2 Structure of Atom MCQs (Set G)
1. The quantum levels upto 𝑛 = 3 has:
(A) d and 𝑝-levels
(B) p,d, s, 𝑓-levels
(D) s-levels
Answer: s, p, d -levels
2. Gases are bad conductors of electricity. Their conductivity may be increased by
(A) increasing the pressure as well as potential 6 difference between the electrodes.
(B) decreasing the pressure as well as potential difference between the electrodes.
(C) decreasing the pressure and/or increasing the potential difference between the electrodes.
(D) increasing the pressure and/or decreasing the potential difference between the electrodes
Answer:decreasing the pressure and/or increasing the potential difference
3. The specific charge of cathode rays:
(B) depends on the potential difference between cathode and anode.
(C) is a universal constant.
(D)None
Answer:None
4. The following fundamental particle are given below ,find the incorrect particle?
(A) Electron
(D) X-rays
Answer : X-rays
5. The e/m ratio of anode rays produced in the discharge tube, depends on the
(C) nature of cathode material.
(D) all of these
Answer :nature of gas filled in tube
6.Find the particle which is not deflected in the magnetic field?
(A) Electron
Answer: Neutron
7. The e/m ratio is maximum for
(A) Na+
(B) Al3+
(C) H+
(D) Mg2+
Answer: H+
CBSE Class 11 Chemistry Chapter 2 Structure of Atom MCQs (Set H)
1.x unit is the e/m ratio of cathode rays is ,when hydrogen is filled in the discharge tube. What will be its value, when deuterium (D2) is filled in it?
(A) x unit
(B) x/2 unit
(C) 2x unit
(D) x/4 unit
Answer: x unit
2. Number of nodal surface in 5s orbital is
(B) 4
(C) 3
(D) 0
Answer: 4
3.The orbital having two nodal surfaces is:
(A) 1s
(B) 2s
(C) 3s
(D) 2p
Answer : 3s
4. The total number of orbitals for (𝑛 + 𝑙) = 4 is
(B) 16
(C) 32
(D) 9
Answer:4
5. Which of the following orbitals has twospherical nodes?
(A) 2s
(B) 4s
(C) 3d
(D) 6f
Answer: 6f
6. Which quantum number differs for the two electrons present in K-shell of an atom?
(A) Principal quantum number
Answer: Magnetic quantum number
7. Find the unpaired electrons are present in the ground state of chromium (Z=24)?
(A) 1
(B) 5
(C) 6
(D) 0
Answer:6
CBSE Class 11 Chemistry Chapter 2 Structure of Atom MCQs (Set I)
1. A subshell 𝑛 = 5, 𝑙 =3 can accommodate: (A) 10 electrons
Answer:14 Electron
2. In H-atom energy of electron is determined by
(A) only 𝑛
Answer: only n
3. How many electrons in an atom can have 𝑛 = 4, 𝑙 = 2, 𝑚 = –2 and 𝑠 = +1?
(A) 1
(B) 2
(C) 5
(D) 10
Answer: 1
4. Not considering the electron spin, the degeneracy of first excited state (𝑛 = 2) of Hatom is:
(A) 2
(B) 3
(C) 4
(D) 8
Answer:4
5. Which orbital has only positive values of wave function at all distances from the nucleus:
(A) 1s
(B) 2s
(C) 3p
(D) 3d
Answer:1s
6. Consider the argon atom. For how many electrons does this atom have ml = 1?
(A) 1
(B) 6
(C) 4
(D) 2
Answer:4
7. Which of the following electron configurations is correct for iron, (atomic number 26)?
(A) [Kr]4s1 3d6
(B) [Kr]4s1 3d7
(C) [Ar]4s2 3d6
(D) [Kr]4s2 3d6
Answer:[Ar]4s2 3d6
8. Which of the following electron configurations is correct for copper, (atomic number 29)?
(A) [Ar] 3d10 4s1
(B) [Kr] 3d9 4s1
(C) [Ar] 3d9 4s2
(D) [Kr] 3d10 4s1
Answer : [Ar] 3d10 4s1
9. The electronic configurations of 24Cr and 29Cu are abnormal
(A) due to exactly half filled and exactly fully filled sub shells extra stability
(C) both the above
(D) None of the above
Answer: Due to exactly half filled and exactly fully filled sub shells extra stability
10. Which of the following orbitals has two spherical nodes?
(A) 2s
(B) 4s
(C) 3d
(D) 6f
Answer:6f
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