Problem 159
Which one of the following substances has the highest proton affinity? [2003] (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{PH}_{3}\) (d) \(\mathrm{H}_{2} \mathrm{~S}\)
Problem 160
The solubilities of carbonates decrease down the magnesium group due to thedecrease in [2003] (a) inter ionic interaction (b) lattice energies of solids (c) entropy of solution formation (d) hydration energies of cations
Problem 161
The solubilities of carbonates decrease down the magnesium group due to a decrease in [2003] (a) lattice energies of solids (b) hydration energies of cations (c) entropy of solution formation (d) inter ionic attraction
Problem 162
Which one of the following ion has the highest value of ionic radius? (a) \(\mathrm{F}^{-}\) (b) \(\mathrm{O}^{2-}\) (c) \(\mathrm{B}^{3+}\) (d) \(\mathrm{Li}^{+}\)
Problem 163
Which one of the following ion has the highest value of ionic radius? (a) \(\mathrm{F}^{-}\) (b) \(\mathrm{O}^{2-}\) (c) \(\mathrm{B}^{3+}\) (d) \(\mathrm{Li}^{+}\)
Problem 164
Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point? [2005] (a) \(\mathrm{LiCl}\) (b) \(\mathrm{NaCl}\) (c) \(\mathrm{KCl}\) (d) \(\mathrm{RbCl}\)
Problem 165
The correct order of the thermal stability of hydrogen halides \((\mathrm{H}-\mathrm{X})\) is \(\quad[2005]\) (a) \(\mathrm{HCl}>\mathrm{HF}>\mathrm{HBr}>\mathrm{HI}\) (b) \(\mathrm{HI}>\mathrm{HCl}>\mathrm{HF}>\mathrm{HBr}\) (c) \(\mathrm{HI}>\mathrm{HBr}>\mathrm{HCl}>\mathrm{HF}\) (d) \(\mathrm{HF}>\mathrm{HCl}>\mathrm{HBr}>\mathrm{HI}\)
Problem 166
Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which one of these statements gives the correct picture? [2006] (a) the reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group (b) in both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group (c) chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens (d) in alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group
Problem 167
The ionic mobility of alkali metal ions in aqueous solution is maximum for (a) \(\mathrm{K}^{+}\) (b) \(\mathrm{Rb}^{+}\) (c) \(\mathrm{Li}^{+}\) (d) \(\mathrm{Na}^{+}\)
Problem 168
The decreasing values of bond angles from \(\mathrm{NH}_{3}\) \(\left(106^{\circ}\right)\) to \(\mathrm{SbH}_{3}\left(101^{\circ}\right)\) down group 15 of the periodic table is due to (a) increasing bp-bp repulsion (b) increasing p orbital character in sp \(^{3}\) (c) decreasing lp-bp repulsion (d) decreasing electronegativity
