Problem 49
A neutral atom will have the lowest ionisation potential when electronic configuration is (1) \(1 \mathrm{~s}^{1}\) (2) \(1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6}\) (3) \(1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}\) (4) \(1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{2}\)
Problem 50
The ionisation energy of nitrogen is more than oxygen because (1) more attraction of electrons by the nucleus (2) the extra stability of half-filled \(p\) -orbitals (3) the size of nitrogen atom is smaller (4) more penetrating effect
Problem 51
The correct order of sccond ionisation potential of \(\mathrm{C}, \mathrm{N}, \mathrm{O}\) and \(\mathrm{F}\) is (1) \(\mathrm{C}>\mathrm{N}>\mathrm{O}>\mathrm{F}\) (2) \(\mathrm{O}>\mathrm{N}>\mathrm{F}>\mathrm{C}\) (3) \(\mathrm{O}>\mathrm{F}>\mathrm{N}>\mathrm{C}\) (4) \(\mathrm{F}>\mathrm{O}>\mathrm{N}>\mathrm{C}\)
Problem 52
The first ionisation energy of sodium is \(500 \mathrm{KJ} \mathrm{mol} !\) This denotes the energy (1) Given out when 1 mole of sodium atoms dissolve in water to form sodium ions (2) Required to remove one electrons to infinity from one atom of sodium (3) Required to raise the electrons in one mole of gascous sodium atoms to a higher energy level (4) Required to change one mole of gascous sodium atoms into gascous ions \(\left(\mathrm{Na}^{\prime}\right)\)
Problem 53
Among the following elements the configuration having highest ionisation energy is (1) \(|\mathrm{Ne}| 3 \mathrm{~s}^{2} 3 \mathrm{p}^{\prime}\) (2) \(|\mathrm{Ne}| 3 \mathrm{~s}^{2} 3 \mathrm{p}^{3}\) (3) \(|\mathrm{Ne}| 3 \mathrm{~s}^{2} 3 \mathrm{p}^{2}\) (4) \(|\mathrm{Ar}| 3 \mathrm{~d}^{10} 4 \mathrm{~s}^{2} 4 \mathrm{p}^{3}\)
Problem 54
The first ionisation potential in electrons volts of nitrogen and oxygen atoms are respectively given as (1) \(14.61 ; 13.67\) (2) \(13.61 ; 14.6\) (3) \(13.6 ; 13.6\) (4) \(14.6 ; 14.6\)
Problem 55
The correct order of decreasing first ionisation potential is (1) \(C>B>B c>L i\) (2) \(\mathrm{C}>\mathrm{Bc}>\mathrm{B}>\mathrm{Li}\) (3) \(\mathrm{B}>\mathrm{C}>\mathrm{Bc}>\mathrm{Li}\) (4) \(\mathrm{Bc}>\mathrm{Li}>\mathrm{B}>\mathrm{C}\)
Problem 61
The \(\mid P_{1}, I P_{2}, I P_{3}, I P_{4}\) and \(I P_{5}\) of an element are \(7.1\), \(14.3,34.5,46.8,162.2 \mathrm{eV}\), respectively. The element is likely to be (1) \(\mathrm{Na}\) (2) Si (3) \(\mathrm{F}\) (4) \(\mathrm{Ca}\)
Problem 62
\(\mathrm{IP}_{2}\) for an clement is invariably higher than \(\mathrm{IP}_{\mathrm{L}}\) because (1) The size of cation is smaller than its atom. (2) It is difficult to remove electron from cation. (3) Effective nuclear charge is more for cation. (4) All
Problem 70
If the number of electrons in the inner shells increases then (1) Ionisation potential increases (2) Screening cffect increases (3) Shielding effect decreases (4) Nuclear attraction on outer electrons increases
