Chapter 16

Which of the following has \(\mathrm{S}-\mathrm{S}\) bond? (a) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}\) (b) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6}\) (c) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\) (d) Mustard gas

Sodium thiosulphate is prepared by (a) reducing \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) solution with \(\mathrm{H}_{2} \mathrm{~S}\) (b) boiling \(\mathrm{Na}_{2} \mathrm{SO}_{3}\) solution with \(\mathrm{S}\) in alkaline medium (c) neutralizing \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) solution with \(\mathrm{NaOH}\) (d) boiling \(\mathrm{Na}_{2} \mathrm{SO}_{3}\) solution wit

A bottle completely filled with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) is left unstoppered for several days and we observe spontaneous overflow of acid. It is due to (a) dehydration of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (b) absorption of air by \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (c) hygroscopic nature of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (d) change in temperature

In \(\mathrm{SO}_{3}^{2-}\) (a) there is sp \(^{3}\) hybridized sulphur atom (b) bonds between \(\mathrm{S}\) and \(\mathrm{O}\) are equivalents (c) \(\mathrm{d} \pi-\mathrm{p} \pi\) bond between \(\mathrm{S}\) and \(\mathrm{O}\) is delocalized (d) all the facts given here are true

Which 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) \(\mathrm{I}_{2}<\mathrm{HI}<\mathrm{ICl}<\mathrm{HIO}_{4}\) (c) \(\mathrm{HIO}_{4}<\mathrm{ICl}<\mathrm{I}_{2}<\mathrm{HI}\) (d) \(\mathrm{I}_{2}<\mathrm{ICl}<\mathrm{HI}<\mathrm{HIO}_{4}\)

Which of the following attacks glass? (a) \(\mathrm{HCl}\) (b) \(\mathrm{HBr}\) (c) \(\mathrm{HI}\) (d) HF

Which species has the maximum number of lone pair of electrons on the central atom? (a) \(\left[\mathrm{I}_{3}\right]\) (b) \(\mathrm{XeF}_{4}\) (c) \(\mathrm{SF}_{4}\) (d) \(\left[\mathrm{ClO}_{3}\right]\)

Hydrolysis of \(\mathrm{NCl}_{3}\) gives \(\mathrm{NH}_{3}\) and \(\mathrm{X}\). Which of the following is \(\mathrm{X} ?\) (a) \(\mathrm{HClO}_{4}\) (b) \(\mathrm{HClO}_{3}\) (c) \(\mathrm{HOCl}\) (d) \(\mathrm{HClO}_{2}\)

Which of the following is the strongest acid? (a) \(\mathrm{ClO}_{3}(\mathrm{OH})\) (b) \(\mathrm{ClO}_{2}(\mathrm{OH})\) (c) \(\mathrm{SO}(\mathrm{OH})_{2}\) (d) \(\mathrm{SO}_{2}(\mathrm{OH})_{2}\)

Which is the best description of the behaviour of bromine in the reaction given below? \(\mathrm{H}_{2} \mathrm{O}+\mathrm{Br}_{2} \longrightarrow \mathrm{HOBr}+\mathrm{HBr}\) (a) reduced only (b) oxidized only (c) both oxidized and reduced (d) proton acceptor only

Select the correct statement. (a) \(\mathrm{ClO}_{2}\) is the anhydride of \(\mathrm{HClO}_{2}\) and \(\mathrm{HClO}_{3}\) (b) \(\mathrm{I}_{2} \mathrm{O}_{5}\) is used in the quantitative estimation of \(\mathrm{CO}\) (c) \(\mathrm{Cl}_{2} \mathrm{O}\) and \(\mathrm{ClO}_{2}\) are used as bleaching agents and as germicides (d) all of the these are correct

Select the correct statement regarding the behaviour of HF as non-aqueous solvent (a) HCl behaves as an acid and HF as a base (b) \(\mathrm{HNO}_{3}\) and \(\mathrm{H}_{2} \mathrm{SO}_{4}\) behave as base and \(\mathrm{HF}\) as an acid (c) HClO \(_{4}\) behaves as a base and HF as an acid (d) all the statements are correct

Bleaching action of chlorine occurs in the presence of (a) moisture (b) sunlight (c) \(\mathrm{O}_{2}\) (d) dry air

What are the products formed when chlorine is passed through aqueous hypo solution? (a) \(\mathrm{Na}_{2} \mathrm{SO}_{3}+\mathrm{SO}_{3}+\mathrm{HCl}\) (b) \(\mathrm{Na}_{2} \mathrm{SO}_{3}+\mathrm{HCl}+\mathrm{S}\) (c) \(\mathrm{Na}_{2} \mathrm{SO}_{4}+\mathrm{HCl}+\mathrm{SO}_{2}\) (d) \(\mathrm{Na}_{2} \mathrm{SO}_{4}+\mathrm{HCl}+\mathrm{S}\)

Fluorine oxidizes \(\mathrm{HSO}_{4}^{-}\)to \(\ldots \ldots\) (a) \(\mathrm{SO}_{2}\) (b) \(\mathrm{S}_{4} \mathrm{O}_{6}^{2-}\) (c) \(\mathrm{S}_{2} \mathrm{O}_{3}^{2}\) (d) \(\mathrm{S}_{2} \mathrm{O}_{8}{\underline{\phantom{xx}}}^{2-}\)

\(\mathrm{Cl}_{2} \mathrm{O}\) is best prepared by passing dry (a) hydrogen chloride and oxygen over hot silver oxide (b) chlorine gas over hot \(\mathrm{HgO}\) (c) chlorine and oxygen over hot silver chlorate (d) hydrogen chloride over phosphorus pentoxide

\(\mathrm{SO}_{2}\) acts as a temporary bleaching agent but \(\mathrm{Cl}_{2}\) acts as a permanent bleaching agent. Why? (a) \(\mathrm{Cl}_{2}\) bleaches due to oxidation but \(\mathrm{SO}_{2}\) bleaches due to reduction (b) \(\mathrm{Cl}_{2}\) bleaches due to reduction but \(\mathrm{SO}_{2}\) bleaches due to oxidation (c) both (a) and (b) (d) none of these

Which one of the following represents the reaction between fluorine and cold dilute \(\mathrm{NaOH} ?\) (a) \(2 \mathrm{~F}_{2}+2 \mathrm{NaOH} \longrightarrow 2 \mathrm{NaF}+\mathrm{OF}_{2}+\mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{F}_{2}+2 \mathrm{NaOH} \longrightarrow \mathrm{NaF}+\mathrm{NaOF}+\mathrm{H}_{2} \mathrm{O}\) (c) \(3 \mathrm{~F}_{2}+\mathrm{NaOH} \longrightarrow 5 \mathrm{NaF}+\mathrm{NaFO}_{3}\) (d) \(2 \mathrm{~F}_{2}^{2}+4 \mathrm{NaOH} \longrightarrow 4 \mathrm{NaF}+2 \mathrm{H}_{2} \mathrm{O}\)

Fluorine is obtained by the interaction of \(\mathrm{K}_{2} \mathrm{MnF}_{6}\) with Lewis acid \(\mathrm{SbF}_{5}\) because of the (a) acidalysis of \(\mathrm{MnF}_{4}\) (b) ionization of \(\mathrm{MnF}_{4}\) (c) decomposition of \(\mathrm{SbF}_{6}\) (d) decomposition of \(\mathrm{MnF}_{4}\)

Which of the following are formed when \(\mathrm{BCl}_{3}\) is treated with \(\mathrm{NH}_{3}\). (a) \(\mathrm{B}\left(\mathrm{NH}_{2}\right)_{3}\) (b) \(\mathrm{B}_{2}\left(\mathrm{NH}_{3}\right)_{2}\) (c) \(\mathrm{BN}\) (d) All of these

Bleaching powder reacts with a few drops of concentrated HCl to give (a) oxygen (b) calcium oxide (c) chlorine (d) hypochlorous acid

When chlorine is passed over dry slaked lime at room temperature, the main reaction product is (a) \(\mathrm{CaCl}_{2}\) (b) \(\mathrm{Ca}(\mathrm{OCl})_{2}\) (c) \(\mathrm{Ca}\left(\mathrm{ClO}_{2}\right)_{2}\) (d) \(\mathrm{CaOCl}_{2}\)

In the manufacture of bromine from sea water, the mother liquor containing bromides is treated with (a) chlorine (b) iodine (c) sulphur dioxide (d) carbon dioxide

Bleaching powder is used as a disinfectant for purification of water. When water-borne germs are killed, the disinfectant activity is destroyed. This is due to its disproportionation into (a) \(\mathrm{CaCl}_{2}\) and \(\mathrm{Ca}\left(\mathrm{ClO}_{3}\right)_{2}\) (b) \(\mathrm{CaO}, \mathrm{Cl}_{2}\) and \(\mathrm{CaCl}_{2}\) (c) \(\mathrm{CaO}\) and \(\mathrm{Cl}_{2}\) (d) \(\mathrm{CaCl}_{2}\) and \(\mathrm{Cl}_{2}\)

Bleaching powder is used as a disinfectant for purification of water. When water-borne germs are killed, the disinfectant activity is destroyed. This is due to its disproportionation into (a) \(\mathrm{CaCl}_{2}\) and \(\mathrm{Ca}\left(\mathrm{ClO}_{3}\right)_{2}\) (b) \(\mathrm{CaO}, \mathrm{Cl}_{2}\) and \(\mathrm{CaCl}_{2}\) (c) \(\mathrm{CaO}\) and \(\mathrm{Cl}_{2}\) (d) \(\mathrm{CaCl}_{2}\) and \(\mathrm{Cl}_{2}\)

Consider the following reaction: \(6 \mathrm{NaOH}+3 \mathrm{Cl}_{2} \longrightarrow 5 \mathrm{NaCl}+\mathrm{A}+3 \mathrm{H}_{2} \mathrm{O}\) What is the oxidation number of chlorine in 'A'? (a) \(-1\) (b) \(+1\) (c) \(+3\) (d) \(+5\)

In the presence of cobalt chloride \(\left(\mathrm{CoCl}_{2}\right)\), bleaching powder decomposes to form (a) \(\mathrm{Cl}_{2} \mathrm{O}\) and \(\mathrm{CaO}\) (b) \(\mathrm{CaCO}_{3}\) and \(\mathrm{O}_{3}\) (c) \(\mathrm{CaCl}_{2}\) and \(\mathrm{O}_{2}\) (d) \(\mathrm{ClO}_{2}\) and \(\mathrm{CaO}\)

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

Which electrolyte is used in the electrolytic method of preparation of fluorine? (a) \(\mathrm{KHF}_{2}+\mathrm{LiF}\) (b) \(\mathrm{CaCl}_{2}+\mathrm{KF}\) (c) \(\mathrm{KF}+\mathrm{LiHF}_{2}\) (d) \(\mathrm{NaF}+\mathrm{CaCl}_{2}\)

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 one of the following order is correct 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) \(\mathrm{I}_{2}>\mathrm{Br}_{2}>\mathrm{Cl}_{2}\)

Which one of the following halogen liberates oxygen, when passed through hot concentrated KOH solution? (a) \(\mathrm{Cl}_{2}\) (b) \(\mathrm{F}_{2}\) (c) \(\mathrm{I}_{2}\) (d) \(\mathrm{Br}_{2}\)

HI can be prepared by all the following methods except (a) \(\mathrm{I}_{2}+\mathrm{H}_{2} \mathrm{~S}\) (b) \(\mathrm{PI}_{3}+\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{KI}+\mathrm{H}_{2} \mathrm{SO}_{4}\) (d) \(\mathrm{H}_{2}+\mathrm{I}_{2} \stackrel{2}{\mathrm{Pt}}{\longrightarrow}\)

Which among the following is paramagnetic? (a) \(\mathrm{ClO}_{2}\) (b) \(\mathrm{Cl}_{2} \mathrm{O}_{6}\) (c) \(\mathrm{Cl}_{2} \mathrm{O}\) (d) \(\mathrm{Cl}_{2} \mathrm{O}_{7}\)

Which of the following oxides of chlorine is obtained by passing dry chlorine over silver chlorate at \(90^{\circ} \mathrm{C}\) ? (a) \(\mathrm{ClO}_{4}\) (b) \(\mathrm{ClO}_{3}\) (c) \(\mathrm{Cl}_{2} \mathrm{O}\) (d) \(\mathrm{ClO}_{2}\)

Chlorine acts as a bleaching agent only in presence of (a) sunlight (b) pure oxygen (c) dry air (d) moisture

Which one of the following pairs of reactants does not form oxygen when they react with each other? (a) \(\mathrm{Cl}_{2}, \mathrm{NaOH}\) solution (cold, dilute) (b) \(\mathrm{F}_{2}, \mathrm{NaOH}\) solution (hot, conc.) (c) \(\mathrm{F}_{2} \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{CaOCl}_{2}, \mathrm{H}_{2} \mathrm{SO}_{4}\) (dilute, small amount)

What is the correct order of occurrence (\% by weight) in air of \(\mathrm{Ne}, \mathrm{Ar}, \mathrm{Kr} ?\) (a) \(\mathrm{Ne}>\mathrm{Ar}>\mathrm{Kr}\) (b) \(\mathrm{Ar}>\mathrm{Ne}>\mathrm{Kr}\) (c) \(\mathrm{Ar}>\mathrm{Kr}>\mathrm{Ne}\) (d) \(\mathrm{Ne}>\mathrm{Kr}<\mathrm{Ar}\)

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

In the Dewar's method of separation of noble gases, the mixture of noble gases is kept in contact with coconut charcoal at \(173 \mathrm{~K}\). Which one of the following gaseous mixtures is not adsorbed on to the charcoal? (a) \(\mathrm{He}, \mathrm{Ne}\) (b) \(\mathrm{Xe}, \mathrm{Kr}\) (c) \(\mathrm{Ar}, \mathrm{Kr}\) (d) \(\mathrm{Xe}, \mathrm{Ar}\)

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

Which of the following statements is false? (a) \(\mathrm{He}_{2}\) does not exist (b) radon is obtained from the decay of radium (c) the most abundant rare gas found in the atmosphere is helium. (d) xenon is the most reactive among the rare gases

The ease of liquefaction of noble gases increase 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) \(\mathrm{He}>\mathrm{Ne}>\mathrm{Ar}>\mathrm{Kr}>\mathrm{Xe}\)

In Fischer-Ringe's method of separation of noble gas mixture from air, ..... is used. (a) \(90 \% \mathrm{CaC}_{2}+10 \% \mathrm{CaCl}_{2}\) (b) soda lime \(+\) potash solution (c) \(90 \% \mathrm{CaCO}_{3}+10 \%\) urea (d) coconut charcoal

Which of the following gas mixtures is used by divers inside the sea? (a) \(\mathrm{O}_{2}+\mathrm{Ar}\) (b) \(\mathrm{O}_{2}+\mathrm{He}\) (c) \(\mathrm{O}_{2}+\mathrm{Xe}\) (d) \(\mathrm{O}_{2}+\mathrm{N}_{2}\)

What are the products formed in the reaction of xenon hexafluoride with silicon dioxide? (a) \(\mathrm{XeO}_{3}+\mathrm{SiF}_{2}\) (b) \(\mathrm{XeOF}_{4}+\mathrm{SiF}_{4}\) (c) \(\mathrm{XeSiO}_{4}+\mathrm{HF}\) (d) \(\mathrm{XeF}_{2}+\mathrm{SiF}_{4}\)

Which of the following is a correct pair with respect to molecular formula of a xenon compound and the hybridization state of xenon in it? (a) \(\mathrm{XeF}_{2}, \mathrm{sp}\) (b) \(\mathrm{XeF}_{4}, \mathrm{sp}^{2}\) (c) \(\mathrm{XeF}_{4}, \mathrm{sp}^{3}\) (d) \(\mathrm{XeF}_{2}, \mathrm{sp}^{3} \mathrm{~d}\)

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

The statement, which prompted Neil Bartlett to prepare the first noble gas compound was (a) \(\mathrm{O}_{2}\) molecule and Xe atom have very similar ionization energies (b) \(\mathrm{PtF}_{6}\) is a strong oxidant (c) \(\mathrm{F}_{2}\) has exceptionally low bond energy (d) Xe-F bond has high bond energy

\(\mathrm{H}_{2} \mathrm{SO}_{4}\) is not used for the preparation of \(\mathrm{CO}_{2}\) from marble chips because (a) calcium sulphate is sparingly soluble and get deposited on marble chips and stops the reaction (b) it does not react (c) the reaction is vigorous (d) huge amount of heat is evolved