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