Chapter 16

The number of P-O-P and P-O-H bonds present respectively in pyrophosphoric acid molecule are (a) 2,2 (b) 1,8 (c) 1,2 (d) 1,4

The equivalent mass of phosphoric acid \(\left(\mathrm{H}_{3} \mathrm{PO}_{4}\right)\) in the reaction, \(\mathrm{NaOH}+\mathrm{H}_{3} \mathrm{PO}_{4} \longrightarrow \mathrm{NaH}_{2} \mathrm{PO}_{4}+\mathrm{H}_{2} \mathrm{O}\) is (a) 98 (b) 89 (c) 49 (d) 58

The species present in solution when \(\mathrm{CO}_{2}\) is dissolved in water are (a) \(\mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{CO}_{3}, \mathrm{HCO}_{3}^{-}, \mathrm{CO}_{3}^{2-}\) (b) \(\mathrm{H}_{2} \mathrm{CO}_{3}, \mathrm{CO}_{3}^{2-}\) (c) \(\mathrm{CO}_{3}^{2-}, \mathrm{HCO}_{3}^{3}\) (d) \(\mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{CO}_{3}^{3}\)

Phosphorus on reaction with conc. HNO \(_{3}\) gives an acid A which can also be formed by the action of dil. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) on powdered phosphorite rock, the acid \(\mathrm{A}\) is (a) \(\mathrm{H}_{3} \mathrm{PO}_{3}\) (b) \(\mathrm{H}_{3} \mathrm{PO}_{4}\) (c) \(\mathrm{H}_{3} \mathrm{PO}_{2}\) (d) \(\mathrm{HPO}_{3}\)

Arrange the acids (1) \(\mathrm{H}_{2} \mathrm{SO}_{3}\), (2) \(\mathrm{H}_{3} \mathrm{PO}_{3}\) and (3) \(\mathrm{HClO}_{3}\) in the decreasing order of acidity (a) \(1>3>2\) (b) \(1>2>3\) (c) \(3>2>1\) (d) \(2>3>1\)

A greenish yellow gas reacts with an alkali metal hydroxide to form a halate which can be used in fire works and safety matches. The gas and halate respectively are (a) \(\mathrm{Br}_{2}, \mathrm{KBrO}_{3}\) (b) \(\mathrm{Cl}_{2}, \mathrm{KClO}_{3}\) (c) \(\mathrm{I}_{2}, \mathrm{NaIO}_{3}\) (d) \(\mathrm{Cl}_{2}^{2}, \mathrm{NaClO}_{3}\)

The maximum percentage of available chlorine on the basis of \(\mathrm{CaOCl}_{2} \cdot \mathrm{H}_{2} \mathrm{O}\) formula is (a) 40 (b) 35 (c) 49 (d) 45

Arrange the following acids (1) \(\mathrm{H}_{2} \mathrm{SO}_{3}\) (2) \(\mathrm{H}_{3} \mathrm{PO}_{3}\) (3) \(\mathrm{HClO}_{3}\), in the increasing order of acid strength. (a) \(2>3>1\) (b) \(3>2>1\) (c) \(1>3>2\) (d) \(1>2>3\)

A yellow metallic powder is burnt in a stream of fluorine to obtain a colourless gas A which is thermally stable and chemically inert. Its molecule has octahedral geometry. Another colourless gas B with same constituent atoms as that of \(\mathrm{A}\) is obtained when sulphur dichloride is heated with sodium fluoride. Its molecule has trigonal bipyramidal geometry. Gases \(\mathrm{A}\) and \(\mathrm{B}\) are respectively (a) \(\mathrm{SF}_{6}\) and \(\mathrm{SF}_{4}\) (b) \(\mathrm{SF}_{4}\) and \(\mathrm{SF}_{6}\) (c) \(\mathrm{SF}_{4}\) and \(\mathrm{S}_{2} \vec{F}_{2}\) (d) \(\mathrm{KCl}\) and \(\mathrm{KBr}\)

In analogy to \(\mathrm{O}_{2}^{+}\left[\mathrm{PtF}_{6}\right]^{-}\)a compound \(\mathrm{N}_{2}^{+}\left[\mathrm{PtF}_{6}\right] Z^{-}\), will not be formed because: (a) The ionization of \(\mathrm{N}_{2}\) gas is higher than that of \(\mathrm{N}\) atom (b) The ionization of \(\mathrm{N}_{2}\) gas is lower than that of \(\mathrm{O}_{2}\) gas (c) The ionization of \(\mathrm{N}_{2}\) gas is higher than that of \(\mathrm{O}_{2}\) gas (d) none of these

In which of the following pairs, the two species are iso-structural? (a) \(\mathrm{SF}_{4}\) and \(\mathrm{XeF}_{4}\) (b) \(\mathrm{SO}_{3}^{2}\) and \(\mathrm{NO}_{3}^{-}\) (c) \(\mathrm{BF}_{3}\) and \(\mathrm{NF}\) (d) \(\mathrm{BrO}_{3}^{-}\)and \(\mathrm{XeO}_{2}\)

Which are correct statements for \(\mathrm{XeF}_{2}\) ? (a) it oxidizes \(\mathrm{Cl}^{-}\)and \(\mathrm{I}^{-}\)to \(\mathrm{Cl}_{2}\) and \(\mathrm{I}_{2}\) respectively (b) it has linear structure (c) it cannot act as \(\mathrm{F}\) - donor (d) it is hydrolyzed rapidly in aqueous solution of a base (a) 1,2 and 4 (b) 1,3 and 4 (c) 2,3 and 4 (d) 3 and 4 only

Pick out the correct statements for \(\mathrm{XeF}_{6}\). (1) it reacts with \(\mathrm{SiO}_{2}\) to form \(\mathrm{XeOF}_{4}\) (2) \(\mathrm{XeF}_{6}\) is hydrolyzed partially to form \(\mathrm{XeOF}_{4}\) (3) it acts as \(\mathrm{F}^{-}\)acceptor when treated with alkali metal fluoride, but cannot act as \(\mathrm{F}^{-}\)donor to form complexes. (4) On complete hydrolysis, it forms \(\mathrm{XeO}_{3}\) (a) 1,3 and 4 (b) 1,2 and 4 (c) 2,3 and 4 (d) 2 and 4 only

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) \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-}<\mathrm{S}_{2} \mathrm{O}_{4}^{2-}<\mathrm{SO}_{3}^{2-}\) (b) \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-}<\mathrm{S}_{2} \mathrm{O}_{6}^{2-}<\mathrm{SO}_{3}^{2}\) (c) \(\mathrm{SO}_{3}^{2-}<\mathrm{S}_{2} \mathrm{O}_{4}^{2-}<\mathrm{S}_{2} \mathrm{O}_{6}^{3}\) (d) \(\mathrm{S}_{2} \mathrm{O}_{4}^{2-}<\mathrm{SO}_{3}^{2-}<\mathrm{S}_{2} \mathrm{O}_{6}^{2}\)

The species that undergoes disproportionation in an alkaline medium are 1\. \(\mathrm{Cl}\), 2\. \(\mathrm{MnO}_{4}^{2-}\) 3\. \(\mathrm{NO}_{2}\) 4\. \(\mathrm{ClO}_{4}^{1}\) (a) 1,2 (b) 1,3 (c) \(1,3,4\) (d) \(1,2,3,4\)

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\. they generally do not form covalent compounds Select the correct properties. (a) (b) 1,3 (c) \(2,3,4\) (d) \(1,2,3\)

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

When a white hygroscopic powder \(\mathrm{X}\) is treated with cold water, a compound \(\mathrm{Y}\) is formed which forms a white precipitate with \(\mathrm{BaCl}_{2}\) in acidic medium. \(\mathrm{Y}\) also gives a white amorphous precipitate with neutral \(\mathrm{AgNO}_{3} .\) Compound Y can also be obtained by heating \(\mathrm{H}_{3} \mathrm{PO}_{4}\) here \(\mathrm{X}\) and \(\mathrm{Y}\) are respectively (a) \(\mathrm{P}_{4} \mathrm{O}_{10}\) and \(\mathrm{H}_{3} \mathrm{PO}_{2}\) (b) \(\mathrm{P}_{4} \mathrm{O}_{10}\) and \(\mathrm{HPO}_{3}\) (c) \(\mathrm{P}_{4} \mathrm{O}_{6}\) and \(\mathrm{H}_{3} \mathrm{PO}_{2}\) (d) \(\mathrm{N}_{2} \mathrm{O}_{5}\) and \(\mathrm{HPO}_{2}\)

A certain compound \(X\) when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution, the precipitate turns white. The compound is (a) \(\mathrm{KI}\) (b) \(\mathrm{K}_{3} \mathrm{PO}_{4}\) (c) \(\mathrm{KBr}\) (d) \(\mathrm{K}_{2} \mathrm{CO}_{3}\)

If 1000 cc of air is passed again and again over heated \(\mathrm{Cu}\) and \(\mathrm{Mg}\) till the reduction in volume stops, the volume finally obtained would be approx. (a) \(800 \mathrm{cc}\) (b) \(200 \mathrm{cc}\) (c) \(10 \mathrm{cc}\) (d) zero \(\mathrm{cc}\)

Pick out the incorrect statement/s about noble gases. (1) 'He' cannot be used in preference to nitrogen \(\left(\mathrm{N}_{2}\right)\) to dilute the oxygen in the gas cyclinders used by divers. (2) 'He' is used in weather balloons and airships. (3) 'He' is used in cryoscopy to obtain the very low temperatures required for superconductivity and lasers. (4) 'Ar' is used in metallurgical processes. (a) 1 and 3 (b) 2 and 3 (c) 1 and 4 (d) 1 only

Compound \(\mathrm{X}\) on reduction with \(\mathrm{LiAlH}_{4}\) gives a hydride Y containing \(21.72 \%\) hydrogen along with other products. The compound \(Y\) reacts with air explosively resulting in boron trioxide. Identify \(\mathrm{Y}\). (a) \(\mathrm{B}_{4} \mathrm{H}_{10}\) (b) \(\mathrm{B}_{2} \mathrm{H}_{6}\) (c) \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}\) (d) both (a) and (b)

Consider the following statements: (1) in diamond, each carbon atom is linked tetrahedrally to four other carbon atoms by sp \(^{3}\) bonds. (2) graphite has planar hexagonal layers of carbon atoms held together by weak Van der Waal's forces. (3) silicon exists only in diamond structure due to its tendency to form pr-p\pi bonds to itself. (a) only 3 is correct (b) only 1 and 2 are correct (c) only 2 and 3 are correct (d) all are correct statements

A compound A of S, Cl and O has a vapour density of \(67.5\). It reacts with water to form two acids and reacts with \(\mathrm{KOH}\) to form two salts \(\mathrm{B}\) and \(\mathrm{C}\). while B gives white precipitate with \(\mathrm{AgNO}_{3}\) solution, C gives white precipitate with \(\mathrm{BaCl}_{2}\) solution. Identify A (a) \(\mathrm{SOCl}_{2}\) (b) \(\mathrm{SO}_{2} \mathrm{Cl}_{2}\) (c) \(\mathrm{SO}_{2} \mathrm{Cl}\) (d) none of these

Match the following: List I (Manufacturing process) 1\. Deacon's process for chlorine 2\. Hydrogenation of vegetable oils 3\. Ostwald's process for nitric acid 4\. Haber's process for ammonia The correct matching is List II (Catalyst used) (i) finely divided iron with molybdenum as promoter (ii) copper(II)chloride (iii) finely divided nickel powder (iv) platinum gauze 1 3 4 (a) (iv) (iii) (ii) (b) (i) (iv) (ii) (iii) (c) (ii) (iii) (i) (iv) (d) (ii) (iii) (iv) (i)

When \(\mathrm{Cl}_{2}\) is passed through hot conc. \(\mathrm{NaOH}\), Salts \(\mathrm{A}\) and \(\mathrm{B}\) are formed which are separated by fractional crystallization. When \(\mathrm{B}\) is treated with a calculated amount of \(\mathrm{KCl}\), a substance \(\mathrm{C}\) is produced. When \(\mathrm{C}\) is gently heated, it disproportionates to give \(\mathrm{D}\) and \(\mathrm{E}\). When \(\mathrm{E}\) is heated with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\), the strongest bronsted acid \(\mathrm{F}\) is formed which is isoelectronic with \(\mathrm{H}_{2} \mathrm{SO}_{4}\). Identify \(\mathrm{F}\). (a) \(\mathrm{HClO}_{2}\) (b) \(\mathrm{HClO}_{3}\) (c) \(\mathrm{HClO}_{4}\) (d) \(\mathrm{HCl}\)

Match the following: List I List II 1\. \(\mathrm{XeF}_{4}\) (i) distorted octahedral 2\. \(\mathrm{XeF}_{6}\) (ii) tetrahedral 3\. \(\mathrm{XeO}_{3}\) (iii) square planar 4\. \(\mathrm{XeO}_{4}\) (iv) pyramidal The correct matching is 1 2 3 4 (a) (iii) (i) (iv) (ii) (b) (ii) (i) (iii) (iv) (c) (i) (iii) (ii) (iv) (d) (iii) (iv) (i) (ii)

Match the following: List I (Compound) 1\. \(\mathrm{XeF}_{2}\) 2\. \(\mathrm{XeF}_{4}\) 3\. XeF 4\. \(\mathrm{XeO}_{3}\) List II (Number of lone pair electron) (i) 0 (ii) 1 (iii) 2 (iv) 3

Select the correct statements about diborane: (a) \(\mathrm{H}_{b} \ldots . \mathrm{B} \ldots \mathrm{H}_{b}\) bond angle is \(122^{\circ}\) (b) All hydrogens in \(\mathrm{B}_{2} \mathrm{H}_{6}\) lie in the same plane (c) \(\mathrm{B}_{2} \mathrm{H}_{6}\) has three centered bond (d) Each boron atom lies in sp \(^{3}\) hybrid state

Which of the following statement is/are correct for \(\mathrm{H}_{3} \mathrm{BO}_{3} ?\) (a) It has a layer structure in which \(\mathrm{BO}_{3}\) units are joined by hydrogen bonds (b) It is obtained by treating borax with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (c) It is mainly monobasic acid and a Lewis acid (d) It does not act as a proton donor but acts as an acid by accepting hydroxyl ions.

Which of the following statement(s) is correct here: (a) Hypo phosphorous acid shows reducing properties (b) Pyrophosphoric acid has although 4 - OH groups but it is a dibasic acid (c) Orthophosphorous acid, is obtained during disproportionation of hypo phosphorous acid (d) Meta phosphoric acid on heating gives \(\mathrm{P}_{4} \mathrm{O}_{10}\)

Which of the following statement(s) is/are false? (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) \(\mathrm{HNO}_{3}\) is a stronger acid than \(\mathrm{HNO}_{2}\) (d) \(\mathrm{HClO}_{4}^{3}\) is a weaker acid than \(\mathrm{HClO}_{3}^{2}\)

\(\mathrm{SO}_{2}\) will be obtained in: (a) \(\mathrm{PbS}+\) air (b) \(\mathrm{FeS}_{2}+\) air (c) \(\mathrm{ZnS}+\mathrm{air}\) (d) \(\mathrm{H}_{2} \mathrm{~S}^{2}+\mathrm{O}_{3}\)

HI can be prepared by which of the following methods (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) \(\mathrm{H}_{2}+\mathrm{I}_{2} \stackrel{2}{\mathrm{Pt}}\)

\(\mathrm{XeO}_{3}\) can be prepared by: (a) \(\mathrm{XeF}_{2}\) hydrolysis (b) \(\mathrm{XeF}_{6}+\mathrm{SiO}_{2} \longrightarrow\) (c) \(\mathrm{XeF}_{4}\) hydrolysis (d) \(\mathrm{XeF}_{6}\) hydrolysis

Which among the following are not peroxo acid of sulphur? (a) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (b) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\) (c) \(\mathrm{H}_{2} \mathrm{SO}_{3}\) (d) \(\mathrm{H}_{2} \mathrm{SO}_{5}\)

Which reagents give oxygen as one of the product during oxidation with ozone? (a) \(\mathrm{H}_{2} \mathrm{~S}\) (b) \(\mathrm{PbS}\) (c) \(\mathrm{SO}_{2}\) (d) \(\mathrm{SnCl}_{2} / \mathrm{HCl}\)

Which of the following is/are correct regarding the electrolytic preparation of \(\mathrm{H}_{2} \mathrm{O}_{2} ?\) (a) sulphuric acid undergoes oxidation (b) hydrogen is liberated at anode (c) \(50 \% \mathrm{H}_{2} \mathrm{SO}_{4}\) is used (d) lead is used as cathode

Select the correct statement(s): (a) \(\mathrm{Cl}_{2} \mathrm{O}\) and \(\mathrm{ClO}_{2}\) are used as bleaching agents and as germicides (b) \(\mathrm{ClO}_{2}\) is the anhydride of \(\mathrm{HClO}_{2}\) and \(\mathrm{HClO}_{3}\) (c) \(\mathrm{I}_{2} \mathrm{O}_{5}\) is used in the quantitative estimation of \(\mathrm{CO}\) (d) \(\mathrm{Cl}_{2} \mathrm{O}_{7}\) is anhydride of \(\mathrm{HClO}\)

Which of the following species involve \(\mathrm{M}-\mathrm{M}\) bond in addition to \(\mathrm{M}-\mathrm{O}\) bonds? (a) Carbon suboxide (b) Pyrosulphate ion (c) Pyrophosphoric acid (d) Dithionate ion

\(\mathrm{XeF}_{6}\) on hydrolysis gives: (a) \(\mathrm{XeO}_{2} \mathrm{~F}_{2}\) (b) \(\mathrm{XeOF}_{4}\) (c) \(\mathrm{XeO}_{4}\) (d) \(\mathrm{XeO}_{3}\)

Argon is used in arc welding because of its (a) low reactivity with metal (b) ability to lower the melting point of metal (c) flammability (d) high calorific value

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) \(\mathrm{H}_{2} \mathrm{SO}_{5}\) (b) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{\mathrm{g}}\) (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 Column-I (a) \(\mathrm{P}_{4} \mathrm{O}_{6}\) (b) \(\mathrm{P}_{2} \mathrm{O}_{5}\) (c) \(\mathrm{N}_{2} \mathrm{O}_{3}\) (d) \(\mathrm{N}_{2} \mathrm{O}_{5}\) Column-II (p) White crystalline solid (q) Waxy solid with garlic smell (r) Blue coloured liquid (s) Co-ordinate bonds

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

\(\mathrm{PCl}_{3}\) 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 \(\mathrm{P}\) 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