Problem 22
The element having highest electron affinity is: (a) Bromine (b) Iodine (c) Fluorine (d) Chlorine
Problem 23
Which of the following is a favourable factor for cation formation? (a) High electron affinity (b) High electronegativity (c) Small atomic size (d) Low ionization potential
Problem 24
The order of first ionization energies of the elements \(\mathrm{Li}, \mathrm{Be}, \mathrm{B}, \mathrm{Na}\) is: (a) \(\mathrm{Be}>\mathrm{Li}>\mathrm{B}>\mathrm{Na}\) (b) \(\mathrm{B}>\mathrm{Be}>\mathrm{Li}>\mathrm{Na}\) (c) \(\mathrm{Na}>\mathrm{Li}>\mathrm{B}>\mathrm{Be}\) (d) \(\mathrm{Be}>\mathrm{B}>\mathrm{Li}>\mathrm{Na}\)
Problem 25
Which of the following is an inert gas? (a) \(\mathrm{O}_{2}\) (b) Argon (c) \(\mathrm{N}_{2}\) (d) \(\mathrm{H}_{2}\)
Problem 26
The outermost electronic configuration of the most electronegative element is: (a) \(\mathrm{ns}^{2} \mathrm{np}^{3}\) (b) \(\mathrm{ns}^{2} \mathrm{np}^{4}\) (c) \(\mathrm{ns}^{2} \mathrm{np}^{5}\) (d) \(\mathrm{ns}^{2} \mathrm{np}^{6}\)
Problem 27
Which one of the following hydroxides is insoluble in water? (a) \(\mathrm{Ca}(\mathrm{OH})_{2}\) (b) \(\mathrm{Ba}(\mathrm{OH})_{2}\) (c) \(\mathrm{Mg}(\mathrm{OH})_{2}\) (d) \(\mathrm{Sr}(\mathrm{OH})_{2}\)
Problem 28
The electronic configuration of four different elements is given below. Identify the group IV element among these. (a) \([\mathrm{He}] 2 \mathrm{~s}^{1}\) (b) \([\mathrm{Ne}] 3 \mathrm{~s}^{2}\) (c) \([\mathrm{Ne}] 3 \mathrm{~s}^{2} 3 \mathrm{p}^{2}\) (d) \([\mathrm{Ne}] 3 \mathrm{~s}^{2} 3 \mathrm{p}^{5}\)
Problem 29
The lanthanide contraction is responsible for the fact that (a) \(\mathrm{Zr}\), Hf have about the same radius (b) \(\mathrm{Zr}, \mathrm{Y}\) have about the same radius (c) \(\mathrm{Zr}\), Nb have same oxidation state (d) \(\mathrm{Zr}, \mathrm{Zn}\) have same oxidation state
Problem 30
Sodium forms \(\mathrm{Na}^{+}\) ion but it does not form \(\mathrm{Na}^{2+}\) because of: (a) Very low value of (IE), and (IE) \(_{2}\) (b) Very high value of (IE), and (IE) \(_{2}\) (c) Low value of (IE), and low value of (IE) (d) Low value of (IE), and high value of (IE)
Problem 31
Which of the electronic configuration represents a noble gas? (a) \(1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{6}\) (b) \(1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2}, 2 \mathrm{p}^{6}, 3 \mathrm{~s}^{2}, 3 \mathrm{p}^{3}\) (c) \(1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2}, 2 \mathrm{p}^{6}, 3 \mathrm{~s}^{2}, 3 \mathrm{p}^{1}\) (d) \(1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{4}\)
