Ionisation Energy MCQ

Ionisation Enthalpy MCQs With Answer

The incorrect statement among the following is

•  The first ionisation potential of Al is less than the first ionisation potential of Mg
•  The second ionisation potential of Mg is greater than the second ionisation potential of Na
•  The first ionisation potential of Na is less than the first ionisation potential of Mg
•  The third ionisation potential of Mg is greater than the third ionisation potential of Al

The first ionization energy is the lowest for

•  Br
•  P
•  Se
•  As

The ionization energy of an element is

•  The same as the electron affinity of the element
•  Equal in magnitude but of opposite sign to the electron affinity of the element
•  The energy released when an electron is added to an atom of the element
•  The energy required to remove the outermost electron of an atom of the element

The first ionisation energies of alkaline earth metals are higher than those of the alkali metals. This is because

•  There is increase in the nuclear charge of the alkaline earth metals
•  There is a decrease in the nuclear charge of the alkaline earth metals
•  There is no change in the nuclear charge
•  None of the above

The statement that is not correct for the periodic classification of elements is

•  The properties of elements are the periodic functions of their atomic numbers
•  Non-metallic elements are lesser in number than metallic elements
•  The first ionisation energies along a period do not vary in a regular manner with increase in atomic number
•  For transition elements the -sub-shells are filled with electrons monotonically with increase in atomic number

Choose the correct statement

•  Ionization energy and electron affinity increases across a period
•  Ionization energy increases but electron affinity decreases along a period
•  Ionization energy decreases but electron affinity increases
•  Both decreases along a period

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na⁺ will be

•  2.55 eV
•  -2.55 eV
•  -5.1 eV
•   Can not Calculate

Ionization potential is lowest for

•  Halogens
•  Inert gases
•  Alkaline earth metals
•  Alkali metals

The first ionization energy of the metals follows the order ?

•  Hg > Zn > Cd
•  Cd > Hg > Zn
•  Hg > Cd > Zn
•  Cd > Zn > Hg

The ionization energy of nitrogen is more than that of oxygen because

•  Nitrogen has half filled p-orbitals
•  Nitrogen is left to the oxygen in the same period of the periodic table
•  Nitrogen contains less number of electrons
•  Nitrogen is less electronegative

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