Q.1
The nucleus of the element having atomic number 25 and atomic weight 55 will contain
  • 55 neutrons
  • 25 protons and 30 neutrons
  • 55 protons
  • 25 neutrons and 30 protons
Q.2
which one of the following pair of atoms /atoms-ion have identical ground state configuration
  • F+ and Ne
  • Li+ and He+
  • Cl- and Ar
  • Na and K
Q.3
For a principal Quantum number n=4, which of the following is incorrect
  • Total number of subshells are 4
  • Total orbitals present is 16
  • None of these
  • The max number of electrons it can have is 32
Q.4
Match the column
class11-chemistry-chapter-2-structure-of-atoms-mcq-2.png
  • p -> iv, q -> iii, r -> ii, s-> i
  • p -> i, q -> iii, r -> ii, s-> iv
  • p -> iii, q -> ii, r -> iv, s-> i
  • p -> ii, q -> iii, r -> iv, s-> i
Q.5
Match the column
class11-chemistry-chapter-2-structure-of-atoms-mcq-1.png
  • p -> ii, q -> iii, r -> iv, s-> i
  • p -> iv, q -> iii, r -> ii, s-> i
  • p -> i, q -> iii, r -> ii, s-> iv
  • p -> ii, q -> i, r -> iv, s-> iii
Q.6
No two electron  in an atom can have
  • the same azimuthal quantum numbers
  • the same principal quantum numbers
  • same magnetic quantum numbers
  • an identical set of four quantum numbers
Q.7
Rutherford’s experiment on scattering of particles showed for the first that atom has
  • Nucleus
  • electron
  • Proton
  • Neutron
Q.8
which of the following statement is not correct for an electron that has quantum number n=4 and m=2?
  • The electron may have the quantum number s= +1/2
  • The electron may have the quantum number l=2
  • The electron may have the quantum number l=3
  • The electron may have the quantum number l=0,1,2,3
Q.9
Any p -orbital can accommodate up to
  • Four electrons
  • two electrons with parallel spin
  • Two electrons with opposite spin
  • six electrons
Q.10
which of the following is incorrect?
  • Unpaired electrons in Iron are 4
  • Unpaired electrons in titanium are 3
  • Unpaired electrons in Chromium are 6
  • Unpaired electrons in cobalt are 3
Q.11
Identify the pairs which are not of isotopes?
  • $^{14}_{6}X$,$^{15}_{6}Y$
  • $^{10}_{4}X$,$^{10}_{5}Y$
  • $^{36}_{18}X$,$^{37}_{18}Y$
  • $^{12}_{6}X$,$^{13}_{6}Y$
Q.12
Bohr’s model can explain
  • the solar spectrum
  • spectrum of atom or ion containing one electron only
  • The spectrum of hydrogen atom
  • The spectrum of hydrogen molecule
Q.13
An electron has a spin quantum number ½ and a magnetic quantum number -1.it cannot be present in
  • d -orbital
  • s -orbital
  • f -orbital
  • p -orbital
Q.14
Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons?
  • Aufbau principle.
  • Heisenberg’s uncertainty principle.
  • Pauli’s exclusion principle
  • Hund’s rule of maximum multiplicity.
Q.15
The ground state configuration of Fe3+ ion in gaseous  state is ( Atomic Number of Fe=26)
  • [Ar]18 3d6
  • [Ar]18 3d5
  • [Ar]18 3d6 4s2
  • [Ar]18 3d3 4s2
Q.16
Cathode rays are
  • electromagnetic waves
  • Stream of electrons
  • Streams of positrons
  • Stream of alpha particles
Q.17
what is the relation for Uncertainty principle
  • $E=mc^2$
  • $\Delta x \times \Delta p = \frac {h}{8 \pi}$
  • $\lambda = \frac {h}{p}$
  • $\Delta x \times \Delta p = \frac {h}{2 \pi}$
Q.18
The pair of ions having same electronic configuration is __________.
  • $Fe^{3+}$, $Mn^{2+}$
  • $Fe^{3+}$, $Co^{3+}$
  • $Sc^{3+}$, $Cr^{3+}$
  • $Cr^{3+}$, $Fe^{3+}$
Q.19
electromagnetic radiation with maximum wavelength is
  • Infrared
  • X -rays
  • Radio wave
  • Ultraviolet
Q.20
Two atoms are said to be isobars if.
  • they have same number of neutrons but different number of electrons.
  • they have same number of electrons but different number of neutrons.
  • sum of the number of protons and neutrons is same but the number of protons is different.
  • they have same atomic number but different mass number.
0 h : 0 m : 1 s