Chapter 14

Hydrogen sulphide reacts with lead acetate forming a black compound which reacts with \(\mathrm{H}_{2} \mathrm{O}_{2}\) to form another compound. The colour of the compound is (a) Black (b) Yellow (c) White (d) Pink

A metal \(X\) on heating in nitrogen gas gives \(Y . Y\) on treatment with \(\mathrm{H}_{2} \mathrm{O}\) gives a colourless gas which when passed through \(\mathrm{CuSO}_{4}\) solution gives a blue colour. \(Y\) is (a) \(\mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}\) (b) \(\mathrm{Mg}_{3} \mathrm{~N}_{2}\) (c) \(\mathrm{NH}_{3}\) (d) \(\mathrm{MgO}\)

In white phosphorous \(\left(\mathrm{P}_{4}\right)\) molecule which one is not correct? (a) Six P-P single bonds are present (b) Four P- P simie bondis are mesent (c) Four lone pairs of eleciron are presentid) (d) P P P bond angle is 60

\(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CrO}_{7}\) on heating liberates a gas. The same gas will be obtained by (a) heating \(\mathrm{NH}_{4} \mathrm{NO}_{2}\) (b) heating \(\mathrm{NH}_{4} \mathrm{NO}_{3}\) (c) treating \(\mathrm{Mg}_{3} \mathrm{~N}_{2}\) with \(\mathrm{H}_{2} \mathrm{O}\) (d) heating \(\mathrm{H}_{2} \mathrm{O}_{2}\) on \(\mathrm{NaNO}_{2}\)

Ozone can be detected by using (d) None of these (a) \(\mathrm{Hg}\) (b) \(\mathrm{Ag}\) (c) \(\mathrm{Na}\)

Which oxide reacts with both \(\mathrm{HCl}\) and \(\mathrm{NaOH}\) (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{CaO}\) (c) \(\mathrm{N}_{2} \mathrm{O}_{5}\) (d) \(\mathrm{ZnO}\)

What colour is produced when ammonia is passed through a solution of copper sulphate? (a) red (b) blue (c) orange (d) yellow

\(\mathrm{N}_{2} \mathrm{O}_{3}\) is (a) an acidic oxide and the anhydride of \(\mathrm{HNO}_{2}\) (b) an acidic oxide and the anhydride of \(\mathrm{H}_{2} \mathrm{~N}_{2} \mathrm{O}_{2}\) (c) a neutral oxide and the anhydride of \(\mathrm{HNO}_{3}\) (d) a basic oxide and the anhydride of \(\mathrm{HNO}_{2}\)

The number of \(S-S\) bonds in sulphur trioxide trimer \(\mathrm{S}_{3} \mathrm{O}_{9}\) is (a) Three (b) Two (c) One (d) Zero

Ozone turns benzidine paper (d) Red (a) Violet (b) Brown (c) Blue

The correct sequence of decrease in the bond angle of following hydrides is (a) \(\mathrm{NH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}>\mathrm{SbH}_{3}\) (b) \(\mathrm{NH}_{3}>\mathrm{AsH}_{3}>\mathrm{PH}_{3}>\mathrm{SbH}_{3}\) (c) \(\mathrm{SbH}_{3}>\mathrm{AsH}_{3}>\mathrm{PH}_{3}>\mathrm{NH}_{3}\) (d) \(\mathrm{PH}_{3}>\mathrm{NH}_{3}>\mathrm{AsH}_{3}>\mathrm{SbH}_{3}\)

The crystals of ferrous sulphate on heating give (a) \(\mathrm{FeO}+\mathrm{SO}_{2}+\mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{FeO}+\mathrm{SO}_{3}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{SO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}\)

Ammonia can be dried by (d) Anhydrous \(\mathrm{CaCl}_{2}\) (a) Conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (b) \(\mathrm{P}_{4} \mathrm{O}_{10}\) (c) \(\mathrm{CaO}\)

The element that has the least tendency to show the inert-pair effect is (a) Bi (b) \(\bar{P}\) (c) \(\mathrm{Sb}\) (d) \(\mathrm{N}\)

When potassium ferrocyanide crystals are heated with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\), the gas evolved is (a) \(\mathrm{SO}_{2}\) (b) \(\mathrm{NH}_{3}\) (c) \(\mathrm{CO}_{2}\) (d) \(\mathrm{CO}\)

Which of the following does not have \(\mathrm{S}-\mathrm{S}\) linkage? (a) \(\mathrm{S}_{2} \mathrm{O}_{8}^{2-}\) (b) \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-}\) (c) \(\mathrm{S}_{2} \mathrm{O}_{5}^{2-}\) (d) \(\mathrm{S}_{2} \mathrm{O}_{3}^{2-}\)

On passing \(\mathrm{H}_{2} \mathrm{~S}\) through acidified \(\mathrm{FeCl}_{3}\) solution, \(\mathrm{FeCl}_{3}\) is converted into (a) \(\mathrm{FeCl}_{2}\) (b) \(\mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}\) (c) \(\mathrm{Fe} \mathrm{S}\) (d) \(\mathrm{FeSO}_{4}\)

Caro's acid is (d) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\) (a) \(\mathrm{H}_{2} \mathrm{SO}_{5}\) (b) \(\mathrm{H}_{2} \mathrm{SO}_{3}\) (c) \(\mathrm{H}_{3} \mathrm{~S}_{2} \mathrm{O}_{5}\)

The basic character of the hydrides of \(\mathrm{V}\) group elements decreases in the order (a) \(\mathrm{NH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}>\mathrm{SbH}_{3}\) (b) \(\mathrm{SbH}_{3}>\mathrm{AsH}_{3}>\mathrm{PH}_{3}>\mathrm{NH}_{3}\) (c) \(\mathrm{NH}_{3}>\mathrm{SbH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}\) (d) \(\mathrm{SbH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}>\mathrm{NH}_{3}\)

The number of \(\mathrm{P}-\mathrm{O}\) - \(\mathrm{P}\) bonds in cyclic metaphosphoric acid is (a) Zero (b) Two (c) Three (d) Four

Which acid on heating produces phosphine? (a) phosphoric acid (b) phosphorous acid (c) peroxymonophosphorie acit' (d) metaphosphoric acid

In which reaction does \(\mathrm{SO}_{2}\) act as oxidizing agent (a) Acidified \(\mathrm{KMnO}_{4}\) (b) Acidified \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{1}\) (c) Acidified \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\) (d) \(\mathrm{HS}\)

Which one of the following is not a true peroxide? (d) \(\overline{\mathrm{H}_{2} \mathrm{SO}_{4}}\) (a) \(\overline{\mathrm{PbO}_{2}}\) (b) \(\mathrm{BaO}_{2}\) (c) \(\mathrm{Na}_{2} \mathrm{O}_{2}\)

The number of hydroxyl groups in pyrophosphoric acid is (a) \(\underline{3}\) (b) \(\overline{4}\) (c) 5

Which one of the following is paramagnetic? (a) \(\mathrm{O}_{2}\) (b) \(\mathrm{N}_{2} \mathrm{O}\) (c) \(\mathrm{He}\) (d) \(\mathrm{NH}_{3}\)

When \(\mathrm{SO}_{2}\) gas is passed through an acidified solution of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (a) the solution becomes blue (b) the solution becomes colourless (c) \(\mathrm{SO}_{2}\) is reduced (d) green \(\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}\) is formed

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

In \(O F_{2}\) molecule, the total number of bond pairs and lone pairs of electrons present respectively are (a) 2,6 (b) 2,8 (c) 2,10 (d) 2,9

There is \(S\)-S bond in (a) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}\) (b) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\) (c) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6}\) (d) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\)

What is the oxidation number of sulphur in \(\mathrm{Na}_{2} \mathrm{~S}_{4} \mathrm{O}_{6}\) ? (a) \(2 / 3\) (b) \(3 / 2\) (c) \(3 / 5\) (d) \(5 / 2\)

Copper tuming when heated with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) gives (a) \(\mathrm{O}_{3}\) (b) \(\mathrm{SO}_{2}\) (c) \(\mathrm{SO}_{3}\) (d) \(\bar{H}_{2} \mathrm{~S}\)

P O P bond is present in (a) \(\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}\) (b) \(\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}\) (c) Both (a) and (b) (d) none of these