Chapter 16

The structure of \(\mathrm{XeO}_{3}\) is (a) linear (b) planar (c) pyramidal (d) T-shaped

\(\mathrm{XeF}_{4}\) and \(\mathrm{XeF}_{6}\) are expected to be (a) reducing (b) oxidizing (c) unreactive (d) strongly basic

Match the following Column-I (a) \(\mathrm{H}_{3} \mathrm{PO}_{4}\) (b) \(\mathrm{HPO}_{3}\) (c) \(\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}\) (d) \(\mathrm{H}_{3} \mathrm{PO}_{2}\) Column-II (p) Can react with \(\mathrm{AgNO}_{3}\) (q) In water softener (r) \(\mathrm{sp}^{3}\) hybridisation (s) Monobasic

Match the following Column-I (a) \(\mathrm{H}_{2} \mathrm{SO}_{5}\) (b) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\) (c) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6}\) (d) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) Column-II (p) S-S linkage (q) \(+6\) oxidation state (r) Peroxy linkage (s) \(-2\) oxidation state

Match the following Match the following Column-I (a) \(\mathrm{XeF}_{2}\) (b) \(\mathrm{XeF}_{4}\) (c) \(\mathrm{XeF}_{6}\) (d) \(\mathrm{XeOF}_{4}\) Column-II (p) One lone pair electron on Xe-atom (q) \(\mathrm{sp}^{3} \mathrm{~d}\) (r) \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) (s) \(\mathrm{sp}^{3} \mathrm{~d}^{3}\) (t) \(+6\) oxidation state of xenon

Match the following $$ \begin{array}{ll} \text { Column-I } & \text { Column-II } \\ \hline \text { (a) } \mathrm{P}_{4} \mathrm{O}_{6} & \text { (p) White crystalline solid } \\ \text { (b) } \mathrm{P}_{2} \mathrm{O}_{5} & \text { (q) Waxy solid with garlic smell } \\ \text { (c) } \mathrm{N}_{2} \mathrm{O}_{3} & \text { (r) Blue coloured liquid } \\ \text { (d) } \mathrm{N}_{2} \mathrm{O}_{5} & \text { (s) Co-ordinate bonds } \\\ \hline \end{array} $$

Match the following $$ \begin{array}{ll} \hline \text { Column-I } & \text { Column-II } \\ \hline \text { (a) Peroxide } & \text { (p) } \mathrm{C}_{3} \mathrm{O}_{2} \\\ \text { (b) Superoxide } & \text { (q) } \mathrm{PbO}_{2} \\ \text { (c) Dioxide } & \text { (r) } \mathrm{KO}_{2} \\ \text { (d) Suboxide } & \text { (s) } \mathrm{H}_{2} \mathrm{O}_{2} \\ & \text { (t) } \mathrm{RbO}_{2} \end{array} $$

\(\mathrm{PCl}_{3}\) and \(\mathrm{PCl}_{5}\) both exists; \(\mathrm{NCl}_{3}\) exists but \(\mathrm{NCl}_{5}\) does not exist. It is due to (a) lower electronegativity of \(\mathrm{P}\) than \(\mathrm{N}\) (b) lower tendency of \(\mathrm{N}\) to form covalent bond (c) availability of vacant d orbital in P but not in \(\mathrm{N}\) (d) statement is itself incorrect

Number of lone pairs of electrons on Xe atoms in \(\mathrm{XeF}_{2}, \mathrm{XeF}_{4}\) and \(\mathrm{XeF}_{6}\) molecules are respectively (a) \(2,3,1\) (b) \(3,2,1\) (c) \(3,2,0\) (d) \(4,3,2\)

Graphite is a soft, solid, lubricant, extremely difficult to melt. The reason for this anomalous behaviour is that graphite (a) has molecules of variable molecular masses like polymers (b) has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds (c) is an allotropic form of diamond (d) is a non crystalline substance

Which one of the following substances has the highest proton affinity? (a) \(\mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{H}_{2} \mathrm{~S}\) (c) \(\mathrm{NH}_{3}\) (d) \(\mathrm{PH}_{3}\)

What is expected to happen when phosphine gas is mixed with chlorine gas? (a) the mixture only cools down (b) \(\mathrm{PCl}_{3}\) and \(\mathrm{HCl}\) are formed and the mixture warms up (c) \(\mathrm{PCl}_{5}\) and \(\mathrm{HCl}\) are formed and the mixture cools down (d) \(\mathrm{PH}_{3} \cdot \mathrm{Cl}_{2}\) is formed with warming up

Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for this is that (a) strong affinity of \(\mathrm{HCl}\) gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke. (b) oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine gas (c) due to strong affinity for water, concen-trated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water and hence the cloud. (d) concentrated hydrochloric acid emits strongly smelling HCl gas all the time.

The pair of species having identical shapes for molecules of both species is (a) \(\mathrm{PF}_{5}, \mathrm{IF}_{5}\) (b) \(\mathrm{XeF}_{2}, \mathrm{CO}_{2}\) (c) \(\mathrm{CF}_{4}, \mathrm{SF}_{4}\) (d) \(\mathrm{BF}_{3}, \mathrm{PCl}_{3}\)

The soldiers of Napolean army, while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey power. This transformation is related to (a) a change in the partial pressure of oxygen in the air (b) an interaction with water vapour contained in the humid air (c) a change in the crystalline structure of tin. (d) an interaction with nitrogen of the air at very low temperatures

How is \(\mathrm{H}_{2} \mathrm{~S}\) prepared in laboratory? (a) \(\mathrm{FeS}+\operatorname{dil} \mathrm{H}_{2} \mathrm{SO}_{4}\) (b) \(\mathrm{FeSO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4}\) (c) \(\mathrm{FeS}+\) conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (d) elementary \(\mathrm{H}_{2}+\) elementary \(\mathrm{S}\)

Which one of the following statements regarding helium is correct? (a) it is used in gas-cooled nuclear reactors (b) it is used to produce and sustain powerful super conducting magnets (c) it is used as a cryogenic agent for carrying out experiments at low temperatures (d) all are correct

Heating an aqueous solution of aluminium chloride to dryness will give (a) \(\mathrm{AlCl}_{3}\) (b) \(\mathrm{Al}_{2} \mathrm{Cl}_{3}\) (c) \(\mathrm{Al}(\mathrm{OH}) \mathrm{Cl}_{2}\) (d) \(\mathrm{Al}_{2} \mathrm{Cl}_{6}\)

The structure of diborane \(\left(\mathrm{B}_{2} \mathrm{H}_{6}\right)\) contains (a) four \(2 \mathrm{c}-2 \mathrm{e}\) bonds and two \(3 \mathrm{c}-2 \mathrm{e}\) bonds (b) two \(2 \mathrm{c}\)-2e bonds and four \(3 \mathrm{c}-2 \mathrm{e}\) bonds (c) two \(2 \mathrm{c}-2 \mathrm{e}\) bonds and two \(3 \mathrm{c}-3 \mathrm{e}\) bonds (d) four \(2 \mathrm{c}\)-2e bonds and four \(3 \mathrm{c}\)-2e bonds

Which of the following oxides is amphoteric in character? (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{SiO}_{2}\) (c) \(\mathrm{SnO}_{2}\) (d) \(\mathrm{CaO}\)

In silicon dioxide (a) there are double bonds between silicon and oxygen atoms (b) silicon is bonded to two silicon atoms (c) each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms (d) each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bounded to two silicon atoms

Of the following sets, which one does not contain isoelectronic species? (a) \(\mathrm{CN}^{-}, \mathrm{N}_{2}, \mathrm{C}_{2}{\underline{\phantom{xx}}}^{2-}\) (b) \(\mathrm{PO}_{4}^{3-}, \mathrm{SO}_{4}^{2-}, \mathrm{ClO}_{4}^{-}\) (c) \(\mathrm{SO}_{3}{\underline{\phantom{xx}}}^{2-}, \mathrm{CO}_{3}^{2-}, \mathrm{NO}_{3}^{-}\) (d) \(\mathrm{BO}_{3}^{3-}, \mathrm{CO}_{3}^{2-}, \mathrm{NO}_{3}^{-}\)

The number of hydrogen atom(s) attached to phosphorous atom in hypophosphorous acid is (a) zero (b) two (c) one (d) three

The correct order of the thermal stability of hydrogen halides \((\mathrm{H}-\mathrm{X})\) is (a) \(\mathrm{HCl}>\mathrm{HF}>\mathrm{HBr}>\mathrm{HI}\) (b) \(\mathrm{Hl}>\mathrm{HCl}>\mathrm{HF}>\mathrm{HBr}\) (c) \(\mathrm{HI}>\mathrm{HBr}>\mathrm{HCl}>\mathrm{HF}\) (d) \(\mathrm{HF}>\mathrm{HCl}>\mathrm{HBr}>\mathrm{HI}\)

The molecular shapes of \(\mathrm{SF}_{4}, \mathrm{CF}_{4}\), and \(\mathrm{XeF}_{4}\) are (a) different with 1,0 and 2 lone pairs of electrons on the central atoms respectively (b) different with 0,1 and 2 lone pairs of electrons on the central atoms respectively (c) the same with 1,1 and 1 lone pair of electrons on the central atoms respectively (d) the same with 2,0 and 1 lone pair of electrons on the central atoms respectively

Which of the following chemical reactions depicts the oxidizing behaviour of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) ? (a) \(2 \mathrm{HI}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{I}_{2}+\mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Ca}(\mathrm{OH})_{2}^{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{CaSO}_{4}+2 \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{NaCl}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{NaHSO}_{4}+\mathrm{HCl}\) (d) \(2 \mathrm{PCl}_{5}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow 2 \mathrm{POCl}_{3}+2 \mathrm{HCl}+\mathrm{SO}_{2} \mathrm{Cl}_{2}\)

What products are expected from the disproportionation reaction of hypochlorous acid? (a) \(\mathrm{HClO}_{3}\) and \(\mathrm{Cl}_{2} \mathrm{O}\) (b) \(\mathrm{HClO}_{2}\) and \(\mathrm{HClO}_{4}\) (c) \(\mathrm{HCl}\) and \(\mathrm{Cl}_{2} \mathrm{O}\) (d) \(\mathrm{HCl}\) and \(\mathrm{HClO}_{3}\)

Which of the following statements is true? (a) \(\mathrm{H}_{3} \mathrm{PO}_{3}\) is a stronger acid than \(\mathrm{H}_{2} \mathrm{SO}_{3}\) (b) in aqueous medium HF is a stronger acid than \(\mathrm{HCl}\) (c) \(\mathrm{HClO}_{4}\) is a weaker acid than \(\mathrm{HClO}_{3}\) (d) \(\mathrm{HNO}_{3}\) is a stronger acid than \(\mathrm{HNO}_{2}\)

Regular use of which of the following fertilizers increases the acidity of soil? (a) urea (b) super phosphate of lime (c) ammonium sulphate (d) potassium nitrate

Which one of the following reactions of Xenon compound is not feasible? (a) \(3 \mathrm{XeF}_{4}+6 \mathrm{H}_{2} \mathrm{O} \longrightarrow 2 \mathrm{Xe}+\mathrm{XeO}_{3}+12 \mathrm{HF}+1.5 \mathrm{O}_{2}\) (b) \(2 \mathrm{XeF}_{2}+2 \mathrm{H}_{2} \mathrm{O} \longrightarrow 2 \mathrm{Xe}+4 \mathrm{HF}+\mathrm{O}_{2}\) (c) \(\mathrm{XeF}_{6}+\mathrm{RbF} \longrightarrow \mathrm{Rb}\left[\mathrm{XeF}_{7}\right]\) (d) \(\mathrm{XeO}_{3}+6 \mathrm{HF} \longrightarrow \mathrm{XeF}_{6}+3 \mathrm{H}_{2} \mathrm{O}\)

The bond dissociation energy of \(\mathrm{B}-\mathrm{F}\) in \(\mathrm{BF}_{3}\) is 646 \(\mathrm{kJ} \mathrm{mol}^{-1}\) whereas that of \(\mathrm{C}-\mathrm{F}\) in \(\mathrm{CF}_{4}\) is \(515 \mathrm{~kJ} \mathrm{~mol}^{-1}\). The correct reason for higher B - F bond dissociation energy as compared to that of \(\mathrm{C}-\mathrm{F}\) is: (a) stronger bond between \(\mathrm{B}\) and \(\mathrm{F}\) in \(\mathrm{BF}_{3}\) as compared to that between \(\mathrm{C}\) and \(\mathrm{F}\) is \(\mathrm{CF}_{4}\) (b) significant \(\mathrm{p}-\mathrm{p}\) interaction between \(\mathrm{B}\) and \(\mathrm{F}\) in \(\mathrm{BF}_{3}\) whereas there is no possibility of such interaction between \(\mathrm{C}\) and \(\mathrm{F}\) in \(\mathrm{CF}_{4}\) (c) lower degree of \(\mathrm{p}-\mathrm{p}\) interaction between \(\mathrm{B}\) and \(\mathrm{F}\) \(\mathrm{BF}_{3}\) than that between \(\mathrm{C}\) and \(\mathrm{F}\) in \(\mathrm{CF}_{4}\) (d) smaller size of \(\mathrm{B}\) - atom as compared to that of C- atom

Three reactions involving \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}\)are given below:[2010] (i) \(\mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{H}_{2} \mathrm{PO}_{4}^{-}\) (ii) \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{HPO}_{4}^{2-}+\mathrm{H}_{3} \mathrm{O}^{+}\) (iii) \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}+\mathrm{OH}^{-} \longrightarrow \mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{O}^{2}\) In which of the above does \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}\)act as an acid? (a) (ii) only (b) (i) and (ii) (c) (iii) only (d) (i) only

Boron cannot form which one of the following anions? (a) \(\mathrm{BO}_{2}^{-}\) (b) \(\mathrm{BF}_{6}^{3-}\) (c) \(\mathrm{B}(\mathrm{OH})_{4}^{-}\) (d) \(\mathrm{BH}_{4}^{-}\)

Which of the following statements regarding sulphur is incorrect? (a) At \(600^{\circ} \mathrm{C}\) the gas mainly consists of \(\mathrm{S}_{2}\) molecules. (b) The vapour at \(200^{\circ} \mathrm{C}\) consists mostly of \(\mathrm{S}_{8}\) rings. (c) \(\mathrm{S}^{2}\) molecule is paramagnetic. (d) The oxidation state of sulphur is never less than \(+4\) in its compounds.

Which of the following is the wrong statement? (a) Ozone is violet black in solid state (b) Ozone is diamagnetic gas (c) ONCl and \(\mathrm{ONO}^{-}\)are isoelectronic (d) \(\mathrm{O}_{3}\) molecule is bent

The reaction of \(\mathrm{Zn}\) with dil and conc \(\mathrm{HNO}_{3}\) respectively produces. (a) \(\mathrm{NO}_{2}\) and \(\mathrm{NO}\) (b) \(\mathrm{NO}\) and \(\mathrm{N}_{2} \mathrm{O}\) (c) \(\mathrm{NO}_{2}\) and \(\mathrm{N}_{2} \mathrm{O}\) (c) \(\mathrm{N}_{2} \mathrm{O}\) and \(\mathrm{NO}_{2}\)