Chapter 14

Which one of the following statements is correct with respect to the basic character? (a) \(\mathrm{PH}_{3}=\mathrm{NH}_{3}\) (b) \(\mathrm{PH}_{3}>\mathrm{P}\left(\mathrm{CH}_{3}\right)_{3}\) (c) \(\mathrm{P}\left(\mathrm{CH}_{3}\right)_{3}>\mathrm{PH}_{3}\) (d) \(\mathrm{PH}_{3}>\mathrm{NH}_{3}\)

Which of the following has the least bond energy? (a) \(\mathrm{H}_{2}\) (b) \(\mathrm{F}_{2}\) (c) \(\mathrm{O}_{2}^{2}\) (d) \(\mathrm{N}_{2}\)

Which of the following has the highest electronegativity? (a) \(\mathrm{K}\) (b) B (c) \(\mathrm{Cl}\) (d) \(\mathrm{Na}\)

Which of the following is the strongest oxidizing agent? (a) \(\mathrm{F}_{2}\) (b) \(\mathrm{Cl}_{2}\) (c) \(\mathrm{Br}_{2}\) (d) \(\mathrm{I}_{2}\)

Which of the following is the correct relation with regard to the electron afinity of halogen? (a) \(\mathrm{F}>\mathrm{Cl}\) (b) \(\mathrm{F}>\mathrm{I}\) (c) \(\mathrm{Br}>\mathrm{F}\) (d) \(\mathrm{Br}>\mathrm{Cl}\)

The configuration of inert gas with smallest size and highest IE is (a) \(1 \mathrm{~s}^{2}\) (b) \(1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6}\) (c) \(1 s^{2} 2 s^{2} 2 p^{5}\) (d) \(1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{6}\)

Noble gases can act as (a) reducing agents (b) oxidizing agents (c) both of these (d) none of these

Noble gases are a group of elements which exhibit very (a) high chemical activity (b) less diamagnetic property (c) high electronegativity (d) low chemical activity

Noble gases are sparingly soluble in water, owing to (a) hydrogen bonding (b) dipole-dipole interactions (c) dipole-induced dipole interactions (d) induced dipole-instantaneous dipole interactions

The increase in boiling points of noble gases from He to Xe is due to the (a) increase in atomic volume (b) increase in electron affinity (c) increase in polarizability (d) decrease in ionization energy

The van der Waals forces in halogen decrease in the order (a) \(\mathrm{I}_{2}>\mathrm{Br}_{2}>\mathrm{Cl}_{2}>\mathrm{F}_{2}\) (b) \(\mathrm{F}_{2}>\mathrm{Cl}_{2}>\mathrm{Br}_{2}>\mathrm{I}_{2}\) (c) \(\mathrm{I}_{2}>\mathrm{F}_{2}>\mathrm{Br}_{2}>\mathrm{Cl}_{2}^{2}\) (d) \(\mathrm{Cl}_{2}>\mathrm{I}_{2}>\mathrm{Br}_{2}>\mathrm{F}_{2}\)

The halogen which oxidizes water to \(\mathrm{O}_{2}\) exothermally is (a) \(\mathrm{I}_{2}\) (c) \(\mathrm{Cl}_{2}\) (b) \(\mathrm{Br}_{2}\) (d) \(\mathrm{F}_{2}\)

Which of the following oxides is solid in nature? (a) \(\mathrm{SnO}_{2}\) (b) \(\mathrm{PbO}_{2}\) (c) \(\mathrm{SiO}_{2}\) (d) all of these

In Vth group, which element has highest boiling point value? (a) \(\mathrm{Bi}\) (b) Sb (c) \(\mathrm{As}\) (d) \(\mathrm{P}\)

Which of the following is arranged in order of increasing thermal stability? (a) \(\mathrm{BaCO}_{3}<\mathrm{SrCO}_{3}<\mathrm{CaCO}_{3}<\mathrm{MgCO}_{3}\) (b) \(\mathrm{CaCO}_{3}^{3}<\mathrm{MgCO}_{3}<\mathrm{BaCO}_{3}<\mathrm{SrCO}_{3}^{3}\) (c) \(\mathrm{MgCO}_{3}<\mathrm{CaCO}_{3}<\mathrm{SrCO}_{3}<\mathrm{BaCO}_{3}\) (d) \(\mathrm{MgCO}_{3}^{3}<\mathrm{SrCO}_{3}^{3}<\mathrm{CaCO}_{3}^{3}<\mathrm{BaCO}_{3}^{3}\)

On dissolving moderate amount of sodium metal in liquid \(\mathrm{NH}_{3}\) at low temperature, which one of the following does not occur? (a) \(\mathrm{Na}^{+}\)ions are formed in the solution (b) liquid \(\mathrm{NH}_{3}\) solution remains diamagnetic (c) liquid \(\mathrm{NH}_{3}\) solution becomes a good conductor of electricity (d) blue coloured solution is obtained

Which of the following is arranged in order of decreasing solubility in water? (a) \(\mathrm{CaSO}_{4}>\mathrm{BaSO}_{4}>\mathrm{BeSO}_{4}>\mathrm{MgSO}_{4}>\mathrm{SrSO}_{4}\) (b) \(\mathrm{BeSO}_{4}>\mathrm{MgSO}_{4}>\mathrm{CaSO}_{4}>\mathrm{SrSO}_{4}^{4}>\mathrm{BaSO}_{4}^{4}\) (c) \(\mathrm{BaSO}_{4}>\mathrm{SrSO}_{4}>\mathrm{CaSO}_{4}>\mathrm{MgSO}_{4}>\mathrm{BeSO}_{4}\) (d) \(\mathrm{BeSO}_{4}>\mathrm{CaSO}_{4}>\mathrm{MgSO}_{4}>\mathrm{SrSO}_{4}>\mathrm{BaSO}_{4}\)

An element (A) occurs in a short period having the configuration \(\mathrm{ns}^{2} \mathrm{np}^{1}\). The formula and nature of its oxide is (a) \(\mathrm{AO}_{3}\), acidic (b) \(\mathrm{A}_{2} \mathrm{O}_{3}\), amphoteric (c) \(\mathrm{AO}_{3}^{5}\), basic (d) \(\mathrm{A}_{2} \mathrm{O}_{3}\), basic

In compounds of the type \(\mathrm{ECl}_{3}\), where \(\mathrm{E}=\mathrm{B}, \mathrm{P}\), As or Bi, the angle \(\mathrm{Cl}-\mathrm{E}-\mathrm{Cl}\) for different \(\mathrm{E}\) are in the order (a) \(\mathrm{B}>\mathrm{P}=\mathrm{As}=\mathrm{Bi}\) (b) \(\mathrm{B}>\mathrm{P}>\mathrm{As}>\mathrm{Bi}\) (c) \(\mathrm{B}<\mathrm{P}=\mathrm{As}=\mathrm{Bi}\) (d) \(\mathrm{B}<\mathrm{P}<\mathrm{As}<\mathrm{Bi}\)

The catenation tendency of \(\mathrm{C}, \mathrm{Si}\) and \(\mathrm{Ge}\) is in the order \(\mathrm{Ge}<\mathrm{Si}<\mathrm{C}\). The bond energies (in \(\mathrm{kJ} \mathrm{mol}^{-1}\) ) of \(\mathrm{C}-\mathrm{C}\), Si-Si and Ge-Ge bonds, respectively are (a) \(348,180,167\) (b) \(180,167,348\) (c) \(348,167,180\) (d) \(167,180,348\)

The correct order of solubility of fluorides of alkaline earth metals is (a) \(\mathrm{BeF}_{2}>\mathrm{MgF}_{2}>\mathrm{CaF}_{2}>\mathrm{SrF}_{2}>\mathrm{BaF}_{2}\) (b) \(\mathrm{MgF}_{2}>\mathrm{BaF}_{2}>\mathrm{SrF}_{2}>\mathrm{CaF}_{2}>\mathrm{BeF}_{2}\) (c) \(\mathrm{BaF}_{2}>\mathrm{SrF}_{2}>\mathrm{CaF}_{2}>\mathrm{MgF}_{2}>\mathrm{BeF}_{2}^{2}\) (d) \(\mathrm{BeF}_{2}>\mathrm{MgF}_{2}>\mathrm{SrF}_{2}>\mathrm{BaF}_{2}>\mathrm{CaF}_{2}\)

In group IV A or 14 of the extended form of the periodic table, with the increase in atomic number, the oxidizing power of tetravalent species increases in the order (a) \(\mathrm{Ge}>\mathrm{Sn}>\mathrm{Pb}\) (b) \(\mathrm{Pb}>\mathrm{Sn}>\mathrm{Ge}\) (c) \(\mathrm{Pb}>\mathrm{Ge}>\mathrm{Sn}\) (d) \(\mathrm{Ge}>\mathrm{Pb}>\mathrm{Sn}\)

Which element-element bond has the highest bond energy? (a) \(\mathrm{SiF}_{4}\) (b) \(\mathrm{Si}-\mathrm{Si}\) (c) \(\mathrm{Sn}-\mathrm{Sn}\) (d) \(\mathrm{Ge}-\mathrm{Ge}\)

The stability of the following alkali metal chlorides follows the order (a) \(\mathrm{CsCl}>\mathrm{KCl}>\mathrm{NaCl}>\mathrm{LiCl}\) (b) \(\mathrm{NaCl}>\mathrm{KCl}>\mathrm{LiCl}>\mathrm{CsCl}\) (c) \(\mathrm{KCl}>\mathrm{CsCl}>\mathrm{NaCl}>\mathrm{LiCl}\) (d) \(\mathrm{LiCl}>\mathrm{KCl}>\mathrm{NaCl}>\mathrm{CsCl}\)

What is the order of basic nature of hydrides of group V elements? (a) \(\mathrm{AsH}_{3}>\mathrm{SbH}_{3}>\mathrm{PH}_{3}>\mathrm{NH}_{3}\) (b) \(\mathrm{NH}_{3}^{3}>\mathrm{SbH}_{3}^{3}>\mathrm{PH}_{3}^{3}>\mathrm{AsH}_{3}^{3}\) (c) \(\mathrm{NH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}>\mathrm{SbH}_{3}\) (d) \(\mathrm{PH}_{3}>\mathrm{NH}_{3}>\mathrm{SbH}_{3}>\mathrm{AsH}_{3}\)

Select incorrect statement about hydrides of group 15 elements (a) the central atom in the hydride is sp \(^{2}\) hybridized (b) \(\mathrm{NH}_{3}\) readily form \(\mathrm{NH}_{4}^{+}\)salts with \(\mathrm{H}^{+} ; \mathrm{PH}_{4}^{+}\)salts are formed with \(\mathrm{H}^{+}\)under anhydrous condition (c) the tetrahedron is distorted due to repulsion between the lone pair of electrons and the bond pairs (d) the bond energy of the \(\mathrm{M}\)-H bond decreases from \(\mathrm{NH}_{3}\) to \(\mathrm{BiH}_{3}\) because of increase in the size of the element.

Which of the following is arranged in the increasing order of enthalpy of vaporization? (a) \(\mathrm{PH}_{3}, \mathrm{AsH}_{3}, \mathrm{NH}_{3}\) (b) \(\mathrm{AsH}_{3}, \mathrm{PH}_{3}, \mathrm{NH}_{3}\) (c) \(\mathrm{NH}_{3}, \mathrm{AsH}_{3}, \mathrm{PH}_{3}^{3}\) (d) \(\mathrm{NH}_{3}, \mathrm{PH}_{3}, \mathrm{AsH}_{3}^{3}\)

The correct order of the solubility of alkaline earth metal chlorides in water is (a) \(\mathrm{BaCl}_{2}>\mathrm{MgCl}_{2}>\mathrm{CaCl}_{2}>\mathrm{BeCl}_{2}>\mathrm{SrCl}_{2}\) (b) \(\mathrm{BeCl}_{2}>\mathrm{MgCl}_{2}>\mathrm{CaCl}_{2}>\mathrm{SrCl}_{2}^{2}>\mathrm{BaCl}_{2}\) (c) \(\mathrm{MgCl}_{2}^{2}>\mathrm{CaCl}_{2}^{2}>\mathrm{BeCl}_{2}^{2}>\mathrm{BaCl}_{2}^{2}>\mathrm{SrCl}_{2}^{2}\) (d) \(\mathrm{BaCl}_{2}>\mathrm{SrCl}_{2}>\mathrm{CaCl}_{2}>\mathrm{MgCl}_{2}^{2}>\mathrm{BeCl}_{2}\)

\(\mathrm{N}\) forms \(\mathrm{NCl}_{3}\) whereas \(\mathrm{P}\) can form both \(\mathrm{PCl}_{3}\) and \(\mathrm{PCl}_{5}\). Why? (a) \(\mathrm{N}\) atoms are larger than \(\mathrm{P}\) atoms in size (b) \(\mathrm{P}\) has low lying \(3 \mathrm{~d}\) orbitals, which can be used for bonding but \(\mathrm{N}\) does not have \(3 \mathrm{~d}\) orbitals in its valence shell (c) \(\mathrm{P}\) is more reactive towards \(\mathrm{Cl}\) than \(\mathrm{N}\) (d) none of these

Thermal stability of \(\mathrm{BaCO}_{3}, \mathrm{CaCO}_{3}\) and \(\mathrm{MgCO}_{3}\) is (a) \(\mathrm{BaCO}_{3}>\mathrm{CaCO}_{3}>\mathrm{MgCO}_{3}\) (b) \(\mathrm{BaCO}_{3}>\mathrm{MgCO}_{3}>\mathrm{CaCO}_{3}\) (c) \(\mathrm{MgCO}_{3}>\mathrm{CaCO}_{3}>\mathrm{BaCO}_{3}\) (d) \(\mathrm{CaCO}_{3}>\mathrm{MgCO}_{3}>\mathrm{BaCO}_{3}^{3}\)

The oxidation states of sulphur in the anions \(\mathrm{SO}_{3}^{2-}\), \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-}\) and \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-}\) follow the order (a) \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-}<\mathrm{S}_{2} \mathrm{O}_{4}^{2-}<\mathrm{SO}_{3}{\underline{\phantom{xx}}}^{2}\) (b) \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-}<\mathrm{S}_{2} \mathrm{O}_{6}^{2-}<\mathrm{SO}_{3}^{2}\) (c) \(\mathrm{SO}_{3}^{2-}<\mathrm{S}_{2} \mathrm{O}_{4}^{2-}<\mathrm{S}_{2} \mathrm{O}_{6}^{2}\) (d) \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-}<\mathrm{SO}_{3}^{2-}<\mathrm{S}_{2} \mathrm{O}_{6}{\underline{\phantom{xx}}}^{2-}\)

Which one of the following sequence is correct with reference to the oxidation number of iodine? (a) \(\mathrm{HI}<\mathrm{I}_{2}<\mathrm{ICl}<\mathrm{HIO}_{4}\) (b) \(\mathrm{I}_{2}<\mathrm{HI}^{2}<\mathrm{ICl}<\mathrm{HIO}_{2}\) (c) \(\mathrm{HIO}_{4}<\mathrm{ICl}<\mathrm{I}_{2}<\mathrm{HI}\) (d) \(\mathrm{I}_{2}<\mathrm{ICl}<\mathrm{HI}<\mathrm{HIO}_{4}\)

The correct order of hydration energy of alkaline earth metal ion is (a) \(\mathrm{Mg}^{2+}>\mathrm{Be}^{2+}>\mathrm{Ba}^{2+}>\mathrm{Ca}^{2+}>\mathrm{Sr}^{2+}\) (b) \(\mathrm{Be}^{2+}>\mathrm{Mg}^{2+}>\mathrm{Ca}^{2+}>\mathrm{Sr}^{2+}>\mathrm{Ba}^{2+}\) (c) \(\mathrm{Ba}^{2+}>\mathrm{Be}^{2+}>\mathrm{Ca}^{2+}>\mathrm{Mg}^{2+}<\mathrm{Sr}^{2}\) (d) \(\mathrm{Be}^{2+}>\mathrm{Ca}^{2+}>\mathrm{Sr}^{2+}>\mathrm{Ba}^{2+}>\mathrm{Mg}^{2}\)

Bond dissociation energies of HF, HCl, HBr follows the order ....... (a) \(\mathrm{HBr}>\mathrm{HCl}>\mathrm{HF}\) (b) \(\mathrm{HCl}>\mathrm{HBr}>\mathrm{HF}\) (c) \(\mathrm{HF}>\mathrm{HBr}>\mathrm{HCl}\) (d) \(\mathrm{HF}>\mathrm{HCl}>\mathrm{HBr}\)

The correct order of acidic strength is (a) \(\mathrm{Cl}_{2} \mathrm{O}_{7}>\mathrm{SO}_{2}>\mathrm{P}_{4} \mathrm{O}_{10}\) (b) \(\mathrm{CO}_{2}^{2}>\mathrm{N}_{2} \mathrm{O}_{3}^{2}>\mathrm{SO}_{3}\) (c) \(\mathrm{Na}_{2} \mathrm{O}>\mathrm{MgO}>\mathrm{Al}_{2}^{3} \mathrm{O}_{3}\) (d) \(\mathrm{K}_{2} \mathrm{O}>\mathrm{CaO}>\mathrm{MgO}\)

The correct order of van der Waals radius of \(\mathrm{F}, \mathrm{Cl}\) and \(\mathrm{Br}\) is (a) \(\mathrm{Cl}>\mathrm{F}>\mathrm{Br}\) (b) \(\mathrm{Br}>\mathrm{Cl}>\mathrm{F}\) (c) \(\mathrm{F}>\mathrm{Cl}>\mathrm{Br}\) (d) \(\mathrm{Br}>\mathrm{F}>\mathrm{Cl}\)

Among the \(\mathrm{C}-\mathrm{X}\) bond (where \(\mathrm{X}=\mathrm{Cl}, \mathrm{Br}, \mathrm{I})\) the correct bond energy order is (a) \(\mathrm{C}-\mathrm{I}>\mathrm{C}-\mathrm{Cl}>\mathrm{C}-\mathrm{Br}\) (b) \(\mathrm{C}-\mathrm{Cl}>\mathrm{C}-\mathrm{Br}>\mathrm{C}-\mathrm{I}\) (c) \(\mathrm{C}-\mathrm{Br}>\mathrm{C}-\mathrm{Cl}>\mathrm{C}-\mathrm{I}\) (d) \(\mathrm{C}-\mathrm{Cl}>\mathrm{C}-\mathrm{I}>\mathrm{C}-\mathrm{Br}\)

When water is allowed to freeze in the presence of \(\mathrm{Ar}\), \(\mathrm{Kr}\) or Xe under pressure, then (a) atoms noble gas (G) trapped in the crystal lattice of ice gives clathrates corresponding to the composition 8G. \(26 \mathrm{H}_{2} \mathrm{O}\) (b) these are called noble gas hydrates (c) both are correct (d) all are incorrect

Which one of the following is the correct order for the bond energies of halogen molecules? (a) \(\mathrm{Cl}_{2}>\mathrm{Br}_{2}>\mathrm{I}_{2}\) (b) \(\mathrm{Br}_{2}>\mathrm{Cl}_{2}>\mathrm{I}_{2}\) (c) \(\mathrm{I}_{2}>\mathrm{Cl}_{2}>\mathrm{Br}_{2}\) (d) \(\mathrm{I}_{2}>\mathrm{Br}_{2}>\mathrm{Cl}_{2}\)

Noble gases do not react with other elements because (a) completely paired up electrons lead to stable electronic configuration (b) the size of their atoms is very small (c) they are found in abundance (d) they are monoatomic

The magnitude of enthalpy for formation of alkali metal halides decreases in the order (a) fluoride \(>\) chloride \(>\) iodide \(>\) bromide (b) iodide \(>\) bromide \(>\) chloride \(>\) fluoride (c) fluoride \(>\) chloride \(>\) bromide \(>\) iodide (d) bromide \(>\) iodide \(>\) fluoride \(>\) chloride

The ease of liquefaction of noble gases increases in the order (a) \(\mathrm{Ar}>\mathrm{Kr}>\mathrm{Xe}>\mathrm{Ne}>\mathrm{He}\) (b) \(\mathrm{Xe}>\mathrm{Kr}>\mathrm{Ne}>\mathrm{Ar}>\mathrm{He}\) (c) \(\mathrm{Kr}>\mathrm{Xe}>\mathrm{He}>\mathrm{Ne}>\mathrm{Ar}\) (d) \(\mathrm{He}>\mathrm{Ne}>\mathrm{Ar}>\mathrm{Kr}>\mathrm{Xe}\)

The elements which occupy the peaks of ionization energy curve are (a) \(\mathrm{Cl}, \mathrm{Br}, \mathrm{I}, \mathrm{F}\) (b) \(\mathrm{Na}, \mathrm{K}, \mathrm{Rb}, \mathrm{Cs}\) (c) \(\mathrm{Na}, \mathrm{Mg}, \mathrm{Cl}, \mathrm{I}\) (d) He, Ne, Ar, Kr

The oxidation state of boron family shows which of the following trend for stable \(+1\) oxidation state? (a) \(\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}(+1\) O.S. stability increases) (b) \(\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}\) (stability of \(+3\) oxidation states) (c) \(\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}\) (stability \(+1\) oxidation state) (d) \(\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}(+3\) O.S. stability increases)

Which of the following oxides is/are amphoteric? 1\. \(\mathrm{Na}_{2} \mathrm{O}\) 2\. \(\mathrm{CaO}\) \(3 . \mathrm{Al}_{2} \mathrm{O}_{3}\) 4\. \(\mathrm{SnO}_{2}\) (a) \(2,3,4\) (b) \(3, \overline{4}\) (c) 2,3 (d) 1,4

Which one of the following statements about halogens is incorrect? (1) The electron affinities are in order \(\mathrm{F}>\mathrm{Cl}>\mathrm{Br}>\mathrm{I}\) (2) \(\mathrm{F}_{2}\) has lower bond dissociation energy than \(\mathrm{Cl}_{2}\) (3) HF is the strongest hydrothalic acid (4) Van der Waals forces are the weakest in iodine (a) 1,2 and 4 (b) 1,3 and 4 (c) 1,2 and 3 (d) 2,3 and 4

Consider the following substances: 1\. \(\mathrm{OF}_{2}\) 2\. \(\mathrm{Cl}_{2} \mathrm{O}\) 3\. \(\mathrm{Br}_{2}^{2} \mathrm{O}\) The correct sequence of \(X-O-X\) bond angle is (a) \(3>2>1\) (b) \(1>2>3\) (c) \(2>1>3\) (d) \(1>3>2\)

Consider the following properties of the noble gases: 1\. They readily form compounds which are colourless 2\. They generally do not form ionic compounds. 3\. They have variable oxidation states in their compounds 4\. Generally do not form covalent compounds Select the correct properties. (a) 1 (b) 1,3 (c) 2,3 (d) \(1,2,3\)

Regarding \(\mathrm{F}\) and \(\mathrm{Cl}\) which of the following statements is correct? 1\. \(\mathrm{Cl}\) can give up an electron more easily than \(\mathrm{F}^{-}\) 2\. \(\mathrm{Cl}\) is a better reducing agent than \(\mathrm{F}^{-}\) 3\. \(\mathrm{Cl}\) is smaller in size than \(\mathrm{F}\) 4\. \(\mathrm{F}^{-}\)can be oxidized more readily than \(\mathrm{Cl}^{-}\) (a) 1,2 and 4 (b) 1 only (c) 1 and 2 (d) 3 and 4

If ionization potential for hydrogen atom is \(13.6 \mathrm{eV}\), then ionization potential for He \(^{+}\)will be (a) \(6.5 \mathrm{eV}\) (b) \(54.4 \mathrm{eV}\) (c) \(13.6 \mathrm{eV}\) (d) \(24.5 \mathrm{eV}\)