Chapter 14

Metals having \(\mathrm{ns}^{1}\) as the valence electronic configuration (a) have a first ionization potential of more than \(10 \mathrm{eV} /\) atom (b) are highly electropositive (c) are highly electronegative (d) act as strong oxidizing reagents

The oxidation state of sodium in sodium amalgam is (a) \(-1\) (b) \(+1\) (c) \(+2\) (d) 0

Which of the following does not give flame colouration? (a) \(\mathrm{Mg}\) (b) \(\mathrm{Ca}\) (c) \(\mathrm{Sr}\) (d) \(\mathrm{Ba}\)

Which of the following alkali metal ions has the lowest ionic mobility in aqueous solution? (a) \(\mathrm{Na}^{+}\) (b) \(\mathrm{Li}^{+}\) (c) \(\mathrm{Rb}^{+}\) (d) \(\mathrm{Cs}^{+}\)

Which type of ion does the anhydrons mixture of KF and HF contain? (a) \(\mathrm{KH}^{+}, \mathrm{F}\) (b) \((\mathrm{KF})^{+}(\mathrm{HF})\) (c) \(\mathrm{K}^{+}, \mathrm{H}^{+}, \mathrm{F}^{-}\) (d) \(\mathrm{K}^{+}, \mathrm{HF}_{2}^{-}\)

What are the products formed when \(\mathrm{Li}_{2} \mathrm{CO}_{3}\) undergoes decomposition? (a) \(\mathrm{LiO}_{2}+\mathrm{CO}\) (b) \(\mathrm{Li}, \mathrm{O}+\mathrm{CO}\) (c) \(\mathrm{Li}_{2} \mathrm{O}_{2}+\mathrm{CO}\) (d) \(\mathrm{Li}_{2} \mathrm{O}+\mathrm{CO}_{2}\)

Which among the following is most soluble in alcohol? (a) \(\mathrm{KClO}_{4}\) (b) \(\mathrm{NaClO}_{4}\) (c) \(\mathrm{CsClO}_{4}^{+}\) (d) \(\mathrm{LiClO}_{4}\)

The metal that dissolves in liquid ammonia, giving a dark blue coloured solution is (a) lead (b) tin (c) silver (d) sodium

The pair of elements that have similar chemical properties is (a) beryllium and boron (b) lithium and magnesium (c) carbon and nitrogen (d) aluminium and magnesium

The relative thermal stabilities of alkali metal halides are such that (a) \(\mathrm{CsCl}>\mathrm{RbCl}>\mathrm{KCl}<\mathrm{NaCl}>\mathrm{LiCl}\) (b) \(\mathrm{CsCl}>\mathrm{RbCl}<\mathrm{KCl}>\mathrm{NaCl}<\mathrm{LiCl}\) (c) \(\mathrm{LiCl}>\mathrm{NaCl}>\mathrm{KCl}>\mathrm{RbCl}>\mathrm{CsCl}\) (d) \(\mathrm{CsCl}>\mathrm{RbCl}>\mathrm{KCl}>\mathrm{NaCl}>\mathrm{LiCl}\)

Photoelectric effect is maximum in (a) \(\mathrm{K}\) (b) \(\mathrm{Cs}\) (c) \(\mathrm{Na}\) (d) \(\mathrm{Li}\)

The ionic conductance of following cations in a given concentration is in the order (a) \(\mathrm{Li}^{+}>\mathrm{Na}^{+}<\mathrm{K}^{+}<\mathrm{Rb}^{+}\) (b) \(\mathrm{Li}^{+}=\mathrm{Na}^{+}<\mathrm{K}^{+}<\mathrm{Rb}^{+}\) (c) \(\mathrm{Li}^{+}>\mathrm{Na}^{+}>\mathrm{K}^{+}>\mathrm{Rb}^{+}\) (d) \(\mathrm{Li}^{+}<\mathrm{Na}^{+}<\mathrm{K}^{+}<\mathrm{Rb}^{+}\)

Alkalimetals have high oxidation potential and hence, they behave as (a) electrolytes (b) Lewis bases (c) oxidizing agents (d) reducing agents

Alkali metals present in their compounds are always (a) monovalent (b) bivalent (c) zerovalent (d) none of these

An element \(M\) reacts with chlorine to form a compound \(\mathrm{X}\). The bond angle in \(\mathrm{X}\) is \(120^{\circ}\). What is \(\mathrm{M}\) ? (a) \(\underline{B}\) (b) \(\mathrm{N}\) (c) \(\mathrm{Be}\) (d) \(\mathrm{Mg}\)

Which of the following has the least ionization potential? (a) \(\mathrm{He}\) (b) \(\mathrm{Li}\) (c) \(\mathrm{Zn}\) (d) \(\mathrm{N}\)

As the alkaline earth metals (except Be) tend to lose their valence electrons readily, they act as (a) bases (b) strong reducing agents (c) weak oxidizing agents (d) weak reducing agents

Which of the following has the maximum ionization cnergy? (a) \(\mathrm{Ca}\) \(\mathrm{Ca}^{2+}+2 \mathrm{e}^{-}\) (b) \(\mathrm{Mg} \longrightarrow \mathrm{Mg}^{2+}+2 \mathrm{e}^{-}\) (c) \(\mathrm{Ba}\) \(-\mathrm{Ba}^{+}+\mathrm{e}^{-}\) (d) \(\mathrm{Be}=\) \(\mathrm{Be}^{+}+\mathrm{e}\)

In view of their low ionization energies, the alkali metals are (a) strong oxidizing agents (b) weak oxidizing agents (c) strong reducing agents (d) weak reducing agents

The increasing order of atomic radius for the elements \(\mathrm{Na}, \mathrm{Rb}, \mathrm{K}\) and \(\mathrm{Mg}\) is (a) \(\mathrm{Mg}<\mathrm{Na}<\mathrm{K}<\mathrm{Rb}\) (b) \(\mathrm{Rb}<\mathrm{K}<\mathrm{Mg}<\mathrm{Na}\) (c) \(\mathrm{Na}<\mathrm{K}<\mathrm{Mg}<\mathrm{Rb}\) (d) \(\mathrm{Na}<\mathrm{Mg}<\mathrm{K}<\mathrm{Rb}\)

Lithium is the strongest reducing agent among alkali metals due to which of the following factors? (a) hydration energy (b) electron affinity (c) lattice energy (d) ionization energy

The alkali metal that reacts with nitrogen directly to form nitride is (a) \(\mathrm{K}\) (b) \(\mathrm{Na}\) (c) \(\mathrm{Li}\) (d) \(\mathrm{Rb}\)

Amongst the trihalides of nitrogen, which one is the least basic? (a) \(\mathrm{NF}_{3}\) (b) \(\mathrm{NCl}_{3}\) (c) \(\mathrm{NBr}_{3}\) (d) \(\mathrm{NI}_{3}\)

Which one of the following arrangement is in the order of increasing density? (a) \(\mathrm{Na}<\mathrm{K}<\mathrm{Li}\) (b) \(\mathrm{Li}<\mathrm{K}<\mathrm{Na}\) (c) \(\mathrm{K}<\mathrm{Li}<\mathrm{Na}\) (d) \(\mathrm{Li}<\mathrm{Na}<\mathrm{K}\)

The decreasing order of solubility of alkaline earth metal hydroxides \(\left[\mathrm{M}(\mathrm{OH})_{2}\right]\) is given as (a) \(\mathrm{Ba}>\mathrm{Sr}>\mathrm{Ca}>\mathrm{Mg}>\mathrm{Be}\) (b) \(\mathrm{Be}<\mathrm{Mg}<\mathrm{Ca}<\mathrm{Sr}<\mathrm{Ba}\) (c) \(\mathrm{Be}=\mathrm{Mg}>\mathrm{Ca}>\mathrm{Sr}>\mathrm{Ba}\) (d) \(\mathrm{Mg}<\mathrm{Be}<\mathrm{Ca}<\mathrm{Ba}<\mathrm{Sr}\)

The electronic configuration of group III elements is (a) \(\mathrm{ns}^{1} \mathrm{np}^{2}\) (b) \(\mathrm{ns}^{1} \mathrm{np}^{3}\) (c) \(\mathrm{ns}^{2} \mathrm{np}^{1}\) (d) \(\mathrm{ns}^{2} \mathrm{np}^{2}\)

Which of the following is the strongest Lewis acid? (a) \(\mathrm{BBr}_{3}\) (b) \(\mathrm{BCl}_{3}\) (c) \(\mathrm{BI}_{3}\) (d) \(\mathrm{BF}_{3}\)

Which of the following ions does not exist as octahedral aqua ions? (a) \(\mathrm{Al}\) (b) \(\mathrm{Ga}\) (c) \(\mathrm{Tl}\) (d) \(\bar{B}\)

Which one of the following is not a Lewis acid? (a) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (b) \(\mathrm{FeCl}_{3}\) (c) \(\mathrm{BF}_{3}^{2}\) (d) \(\mathrm{SiF}_{4}\)

Ga is below Al in the periodic table, but atomic radius of Ga is less than \(\mathrm{Al}\). It is because of (a) lanthanoid contraction (b) greater screening effect (c) inert pair effect (d) none of these

The thermal stability order for group 14 halides is (a) \(\operatorname{SnX}_{4}>\mathrm{GeX}_{4}>\mathrm{SiX}_{4}>\mathrm{CX}_{4}\) (b) \(C \mathrm{CX}_{4}^{4}>\mathrm{SiX}_{4}>\mathrm{GeX}_{4}^{4}>\mathrm{SnX}_{4}^{4}\) (c) \(\mathrm{SiX}_{4}^{4}>\mathrm{CX}_{4}^{4}>\mathrm{GeX}_{4}^{4}>\mathrm{Sn} \mathrm{X}_{4}^{4}\) (d) \(C X_{4}^{4}>\operatorname{Sn} X_{4}>G e X_{4}>S i X_{4}^{4}\)

Which of the following is a false statement? (a) boron hydrides are formed when dil. HCl reacts with \(\mathrm{Mg}_{3} \mathrm{~B}_{2}\) (b) all the B -H bond distances in \(\mathrm{B}_{2} \mathrm{H}_{6}\) are equal (c) \(\mathrm{BH}_{3}\) is not a stable compound (d) the boron hydrides are readily hydrolyzed

Elements of group 14 (a) form \(\mathrm{M}^{4}\) and \(\mathrm{M}^{4}\) ions (b) form \(\mathrm{M}^{4+}\) ions (c) exhibit oxidation state of \(+4\) (d) exhibit oxidation state of \(+4\) and \(+2\)

Maximum ability of catenation is shown by (a) sulphur (b) nitrogen (c) oxygen (d) carbon

The shape of tetrahalides of group 14 clements is (a) tetrahedral (b) octahedral (c) trigonal bipyramidal (d) square planar

The C-X bond energy order for carbon tetrahalide is (a) \(\mathrm{CI}_{4}>\mathrm{CBr}_{4}>\mathrm{CCl}_{4}>\mathrm{CF}_{4}\) (b) \(\mathrm{CCl}_{4}^{4}>\mathrm{CBr}_{4}^{4}>\mathrm{CI}_{4}>\mathrm{CF}_{4}^{4}\) (c) \(\mathrm{CF}_{4}^{4}>\mathrm{CCl}_{4}^{4}>\mathrm{CBr}_{4}^{4}>\mathrm{CI}_{4}\) (d) \(\mathrm{CCl}_{4}>\mathrm{CI}_{4}>\mathrm{CBr}_{4}>\mathrm{CF}_{4}\)

Which of the following has the highest first ionization potential? (a) P (b) \(\mathrm{K}\) (c) \(\mathrm{Al}\) (d) Si

The strongest base is (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{PH}_{3}\) (c) \(\mathrm{AsH}_{3}\) (d) \(\mathrm{SbH}_{3}\)

Which of the following is the most basic oxide? (a) \(\mathrm{Al}_{2} \mathrm{O}_{3}\) (b) \(\mathrm{SeO}_{2}\) (c) \(\mathrm{Bi}_{2} \mathrm{O}_{3}\) (d) \(\mathrm{Sb}_{2} \mathrm{O}_{3}\)

Which of the following species has the highest dipole moment? (a) \(\mathrm{PH}_{3}\) (b) \(\mathrm{NH}_{3}\) (c) \(\mathrm{SbH}_{3}\) (d) \(\mathrm{AsH}_{3}\)

Which of the following oxides will be the least acidic? (a) \(\mathrm{As}_{4} \mathrm{O}_{10}\) (b) \(\mathrm{P}_{4} \mathrm{O}_{6}\) (c) \(\mathrm{P}_{4} \mathrm{O}_{\mathrm{n}}\) (d) \(\mathrm{As}_{4} \mathrm{O}_{6}\)

Amongst \(\mathrm{H}_{2} \mathrm{O}, \mathrm{H}_{2} \mathrm{~S}, \mathrm{H}_{2} \mathrm{Se}\) and \(\mathrm{H}_{2} \mathrm{Te}\) the one with the highest boiling point is (a) \(\mathrm{H}_{2} \mathrm{O}\) because of hydrogen bonding (b) \(\mathrm{H}_{2}\) Te because of higher molecular weight (c) \(\mathrm{H}_{2}\) Se because of lower molecular weight (d) \(\mathrm{H}_{2}^{2} \mathrm{~S}\) because of hydrogen bonding

Which one has the lowest boiling point? (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{SbH}_{3}\) (c) \(\mathrm{AsCl}_{3}\) (d) \(\mathrm{PH}_{3}\)

The number of oxygen atoms bonded to cach phosphorous atom in \(\mathrm{P}_{4} \mathrm{O}_{10}\) is (a) 6 (b) 5 (c) 4 (d) 3

d \(\mathrm{d}-\mathrm{p} \pi\) bonding is shown in (a) \(\mathrm{P}_{2} \mathrm{O}_{3}, \mathrm{P}_{2} \mathrm{O}_{5}, \mathrm{PO}_{4}^{3-}\) (b) \(\mathrm{CO}, \mathrm{NO}, \mathrm{CO}_{2}, \mathrm{NO}_{2}\) (c) \(\mathrm{NH}_{3}, \mathrm{PH}_{3}, \mathrm{BiH}_{3}\) (d) \(\mathrm{NO}_{3}^{3}, \mathrm{NO}_{2}^{-}, \mathrm{N}^{3}, \mathrm{CN}^{-}\)

Which of the following fluorides does not exist? (a) \(\mathrm{PF}_{4}\) (b) \(\mathrm{SbF}_{8}\) (c) \(\mathrm{NF}_{5}\) (d) \(\mathrm{AsF}_{5}\)

Which one of the following hydrides is most acidic? (a) \(\mathrm{H}_{2} \mathrm{Te}\) (b) \(\mathrm{H}_{2} \mathrm{~S}\) (c) \(\mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{H}_{2} \mathrm{Se}\)

Which of the following hasthe mostacidic character? (a) HF (b) \(\mathrm{HCl}\) (c) \(\mathrm{HBr}\) (d) HI

Which one of the following elements does not form the compound, \(\mathrm{M}_{4} \mathrm{O}_{10}(\mathrm{M}=\) element \() ?\) (a) As (b) \(\mathrm{Bi}\) (c) \(\mathrm{Sb}\) (d) \(\mathrm{Pb}\)

Which of the following bonds will be mostpolar? (a) \(\mathrm{O}-\mathrm{F}\) (b) \(\mathrm{N}-\mathrm{F}\) (c) \(\mathrm{N}-\mathrm{N}\) (d) \(\mathrm{N}-\mathrm{Cl}\)