CBSE Questions for Class 11 Medical Chemistry Structure Of Atom Quiz 5 - MCQExams.com

Three isotopes of oxygen, each containing 8, 9, 10 neutrons respectively has the % of one isotope (containing 8 neutrons) 90%. The abundance of other isotopes is :
(The atomic weight of oxygen is 16.12)
  • 7%, 3%
  • 5%, 5%
  • 8%, 2%
  • none of these
Which pair of sub-shell has same energy for above described exceptional element under rule (a)?
  • 1s, 2s
  • 2s, 2p
  • 3d, 4p
  • 5p, 4s
If the energy of the second Bohr's orbit in H-atom is $$- 328 \ kJ$$ $$mol^{-1}$$, then what is the energy of the fourth Bohr orbit?
  • $$- 82\, kJ\, mol^{-1}$$
  • $$- 41\, kJ\, mol^{-1}$$
  • $$- 1312\, kJ\, mol^{-1}$$
  • $$- 164\, kJ\, mol^{-1}$$
When 3d orbital is completely filled, the next electron will enter the :
  • 3p - orbital
  • 4p - orbital
  • 4s - orbital
  • 4d - orbital
............... of an element are the atoms of same element having same atomic number but different mass number.
  • Isotope
  • Isobar
  • Isotone
  • Isoelectron
The ionisation energy of isotopes of an element will be:
  • same
  • different
  • dependent on atomic masses
  • dependent on the number of neutrons present in the nucleus
If aufbau rule is not followed, $$_{20}Ca$$ will be placed in .......... block
  • s-
  • p-
  • d-
  • f-
The radius of an atom is of the order of:
  • 10$$^{-12}$$ cm
  • 10$$^{-14}$$ cm
  • 10$$^{-10}$$ cm
  • 10$$^{-8}$$ cm
Which one is not a correct statement about matter?
  • Matter is particle in nature
  • The particles of matter have no space in between them
  • The particles of matter are in state of motion
  • The particles of matter have force of attraction between them
The number of unpaired electrons in a chromic ion $$Cr^{3+}$$ $$($$atomic number $$24)$$ is:
  • $$6$$
  • $$4$$
  • $$3$$
  • $$1$$
Which of the following is the characteristic feature of an isotopes?
  • Same number of electrons and protons but different number of neutrons
  • Same number of electrons but different number of protons
  • Same number of neutrons but different number of electrons
  • None of the above
The mass of an electron is approximately:
  • $$2000$$ times the mass of a proton
  • $$2000$$ times the mass of a neutron
  • $$\dfrac {1}{2000}$$ times the mass of a proton
  • same as the mass of a proton
Which one of the following sequences with regard to the energy content of different orbitals, is correct?
  • $$1s< 2s< 2p< 3d< 4s< 4p$$
  • $$1s< 2s< 2p< 4s< 3d< 4p$$
  • $$1s< 2s< 4s< 2p< 4p< 3d$$
  • $$1s< 2s< 3d< 4s< 2p< 4p$$
A natural phenomenon that supports the experimental conclusion that atoms are divisible is :
  • allotropy
  • radioactivity
  • cracking
  • none of these
Which of the following are the correct examples of matter?
  • Glass bottle, water and noise.
  • Air, wood and vacuum.
  • Silver foil, hot air and chalk.
  • Sand, oxygen and light flash.
Structures of nuclei of three atoms A, B and C are given below :
A has 90 protons and 146 neutrons
B has 92 protons and 146 neutrons
C has 90 protons and 148 neutrons 
Based on the above data, which of these atoms are isotopes and which are isobars ? 
  • A and C are isotopes; B and C are isobars
  • A and B are isotopes; A and C are isobars
  • B and C are isobars; A and B are isotopes
  • A and C are isotopes; A and B are isobars
Which of the following is whole number?
  • Atomic mass
  • Atomic number
  • Atomic volume
  • Atomic radius
What are nucleons?
  • the sum of protons and neutrons present in the nucleus.
  • the number of protons in the nucleus.
  • the number of neutrons in the nucleus.
  • the sum of protons, neutrons and electrons present in the nucleus.
Artificial radioactivity was discovered by:
  • Rontegen
  • Becquerel
  • Marie Curie
  • Irene Joliot Curie
The number of electrons in an element with atomic number A and mass number B will be
  • A-B
  • B-A
  • B
  • A
A series of orbitals are given below. Identify the sets which represent the correct order of filling up of orbitals.
(A) $$3s,\ 3p,\ 3d,\ 4s,\ 4p$$
(B) $$4s,\ 4p,\ 5s,\ 4d,\ 5p,\ 4f$$
(C) $$2s,\ 2p,\ 3s,\ 3p, \ 4s,\ 3d,\ 4p$$
(D) $$1s,\ 2s,\ 2p,\ 3s,\ 3p,\ 3d$$
  • A and B
  • B and C
  • B and D
  • A and D
An atom has 16 neutrons in its nucleus. The atomic no. of the element is 15 and the mass number of the element is__________.
  • 15
  • 16
  • 31
  • None of these
The element with electronic configuration 2, 8, 6 is _____________.
  • metallic 
  • non-metallic 
  • metalloid 
  • None of these
For an atom of a given element, the number of electrons is given by _________.
  • the number of protons $$+$$ number of neutrons
  • the atomic number of the element
  • the number of proton $$-$$ number of neutrons
  • the mass number of the element
X number of electrons would have about the same mass as proton or a neutron? Identify X.
  • 200
  • 500
  • 2000
  • 5000
Splitting of spectral lines in the presence of electric field is known as :
  • Stark effect
  • Zeeman's effect
  • Compton effect
  • Moseley's effect
State True or False.
For hydrogen atom, the energies of the sub-shells $$4s, 4p, 4d,\ and \ 4f$$ are in the order $$4f > 4d > 4p > 4s$$ :
  • True
  • False
The number of electrons in an element with atomic number X and mass number Y will be:
  • X - Y
  • Y - X
  • X + Y
  • X
Isotopes of an element are separated by ____________ method.
  • chromatography
  • mass spectrographic
  • isolation
  • none of the above
"The atom as a whole is electrically neutral", is a statement proposed by which atomic model?
  • Thomson's atomic model
  • Goldstein's atomic model
  • Chadwick's atomic model
  • None of the above
If number of electrons in an atom is 8 and number of protons is also 8, then give the atomic number of atom and the charge on the atom.
  • (i) Atomic number = 8, (ii) Charge = 0
  • (i) Atomic number = 4, (ii) Charge = 0
  • (i) Atomic number = 8, (ii) Charge = +1
  • (i) Atomic number = 4, (ii) Charge = +1
The __________ properties of isotopes are similar but their _______ properties are different.
  • chemical, physical
  • physical, chemical
  • mechanical, chemical
  • mechanical, physical
Which of the following was not proposed by Thomson?
  • The negative and positive charges are equal in magnitude
  • The electrons revolve around the nucleus in circular paths
  • The electrons are embedded in a positive sphere
  • Atoms are electrically neutral
Thomson proposed that:
  • an atom consists of a positively charged sphere and electrons are embedded in it.
  • negative and positive charges are equal in magnitude. So that atoms as a whole are electrically neutral.
  • Both $$A$$ and $$B$$
  • None of above
Matter has both _________ and _________.
  • mass, volume
  • mass, weight
  • life, particle
  • None of the above
Which of the following statement is incorrect according to Thomson's model of an atom?
  • The electrons, in a sphere of positive charge, were like currants (dry fruits) in a spherical Christmas pudding.
  • The positive charge in the atom is spread all over like the red edible part of the watermelon.
  • The electrons are studded in the positively charged sphere, like the seeds in the watermelon.
  • The protons are studded in the positively charged sphere, like the seeds in the watermelon.
The energy of an electron depends on the size of the .....
  • orbit
  • orbitals
  • both $$A$$ and $$B$$
  • none of the above

In Thomson's plum-pudding model, electrons are not:
  • negatively charged
  • present in every type of atom
  • collected together in the center of the atom
  • scattered throughout a blob of positively charged material
Which of the following is not matter?
  • Oxygen
  • Microwaves
  • Water
  • All of above
How would you describe J. J. Thomsons model of the atom? 
  • An atom is indivisible
  • The atom is composed of only negatively charged particles.
  • The atom is composed of a positive core with negatively charged particles orbiting the positive core.
  • The atom is composed of diffused ball of positive charge with negative particles dispersed throughout.
How many of the following is the matter?

Chair, Air, Heat, Smell, Sound, Almonds, Thought and Cold drink.
  • $$4$$
  • $$5$$
  • $$6$$
  • $$7$$
How is the number of rings in the Bohr's model of any element determined?
  • Column number on periodic table
  • Atomic mass
  • Row number on periodic table
  • Atomic number
Why  helium is a matter?
  • It has mass.
  • It is a gas.
  • It occupies space.
  • All of above.
Thomson's model was rejected because :
  • it was not clearly specified in detail
  • it could not explain how both positively and negatively charged particles protect their identity being together
  • it does not explain any repulsions which might result since all the positive charges are together in an cluster and same is the case with negative charges as well
  • All of these
According to J.J. Thomson's atomic model, negative charges are embedded in:
  • a positively charged sphere
  • a lump of neutral charge
  • a lump of small atoms
  • None of the above
A matter has ___________.
  • volume
  • mass
  • both A and B
  • none of above
Chemically, matter can be classified as ___________.
  • pure and impure substances
  • elements, compounds and mixtures
  • solids, liquids and gases
  • metals and non-metals
Matter is present in which state?
  • Solid
  • Liquid
  • Gas
  • All of above

Which of the following is an example of matter?
  • Mars
  • Sun
  • Snow
  • All of the above
Matter consist of particles such as ____.
  • ions
  • molecules
  • atoms
  • All of the above
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