Chapter 34

One among the following compounds will not give effervescence with sodium carbonate. (a) Phenol (b) \(2,4,6\) - Trinitrophenol (c) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CO}_{2} \mathrm{H}\) (d) \(\mathrm{C}_{6} \mathrm{H}_{3} \mathrm{SO}_{3} \mathrm{H}\)

Which of the following reagents is used to identify acetic acid? (a) Tollen's reagent (b) Neutral \(\mathrm{FeCl}_{3}\) solution (c) Ceric ammonium nitrate (d) \(\mathrm{NaOH}\) and \(\mathrm{I}_{2}\)

One can distinguish between \(\mathrm{HCOOH}\) and \(\mathrm{CH}_{3}\) COOH with (a) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (b) \(\mathrm{FeCl}_{3}\) (c) \(\mathrm{NaHCO}_{3}\) (d) Tollen's reagent

A compound with molecular formula \(\mathrm{C}_{4} \mathrm{H}_{10} \mathrm{O}_{4}\) on acylation with acetic anhydride gives a compound with molecular formula \(\mathrm{C}_{12} \mathrm{H}_{18} \mathrm{O}_{8}\). How many hydroxyl groups are present in the compound? (a) 2 (b) 3 (c) 4 (d) 5

Acetic anhydride is used for the detection and estimation of (a) \(-\) COOH group (b) \(-\mathrm{OH}\) group (c) \(-\mathrm{CONH}_{2}\) group (d) \(-\) CHO group

In order to distinguish between \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2}\) and \(\mathrm{C}_{6} \mathrm{H}_{5}\) \(-\mathrm{NH}_{2}\), which of the following reagents is useful? (a) \(\beta\)-naphthol (b) Hinsberg reagent (c) \(\mathrm{NaOH}\) (d) \(\mathrm{CHCl}_{3} / \mathrm{KOH}\)

Which of the following cannot reduce ammonical silver nitrate solution? (a) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NHOH}\) (b) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}\) (c) \(\mathrm{HCOOH}\) (d) \(\mathrm{CH}_{3} \mathrm{CHO}\)

If a compound reacts with \(\mathrm{HNO}_{2}\) but does not form a dye with \(\beta-\) naphthol. The compound may contain (a) \(\mathrm{NH}_{2}\) group as the main functional group (b) \(\mathrm{NH}_{2}\) group in the side chain (c) The compound may have a phenolic group (d) Both (a) and (b)

Which of the following is not a correct statement? (a) The aqueous solution of potash alum is acidic due to cationic hydrolysis. (b) Mohr's salt is a double salt (c) Aniline yellow is also called p-amino azobenzene. (d) Iodoform can be prepared from methanol also by haloform reaction.

Which is not correct regarding the titration of ferrous ammonium sulphate and \(\mathrm{KMnO}_{4} ?\) (a) Here \(\mathrm{KMnO}_{4}\) acts like an oxidant and a self indicator (b) Here high temperature is maintained during the titration (c) Here ferrous sulphate is oxidized into ferric sulphate. (d) Both (b) and (c)

Phenolphthalein acts as an indicator within a \(\mathrm{pH}\) range of (a) \(8.2-10\) (b) \(6.2-7.2\) (c) \(4.2-6.2\) (d) \(2.2-4.2\)

For the preparation of lyophobic colloids the methods used are normally (a) By dissolution into water (b) Condensation method (c) Dispersion method (d) Both (b) and (c)

Esters are generally characterized by their (a) Pungent smell (b) Sweet smell (c) Rotten egg smell (d) mustard oil like smell

The ion that cannot be precipitated by both \(\mathrm{HCl}\) and \(\mathrm{H}_{2} \mathrm{~S}\) is (a) \(\mathrm{Ag}^{+}\) (b) \(\mathrm{Cu}^{+}\) (c) \(\mathrm{Sn}^{2+}\) (d) \(\mathrm{Pb}^{2+}\)

Dimethyl glyoxime in a suitable solvent was refluxed for 10 minutes with pure pieces of nickel sheet, it will result in (a) blue precipitate (b) yellow precipitate (c) red precipitate (d) no precipitate

Which of the following reagents can be used to separate a mixture of aniline and phenol here? (1) \(\mathrm{NaHCO}_{3}\) (2) Bromine \(/ \mathrm{H}_{2} \mathrm{O}\) (3) \(\mathrm{NaOH}\) (4) \(\mathrm{HCl}\) (a) 1 and 3 (b) 2 and 4 (c) 3 and 4 (d) 1,3 and 4

An organic compound ' \(\mathrm{X}\) ' with a molecular formula \(\mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}_{2}\) when reacts with excess of methyl magnesium chloride following by acidification gives an alcohol ' \(\mathrm{Y}\) ' only, when this alcohol ' \(\mathrm{Y}\) ' is oxidized with \(\mathrm{NaOCl}\) followed by acidification, acidic acid is formed. Here the compound ' \(\mathrm{X}\) ' is (a) Propyl methanoate (b) Isopropyl methanoate (c) Ethyl ethanoate (d) Both (a) and (b)

A salt on treatment with dil. HCl gives a pungent smelling gas and a yellow precipitate. The salt gives green flame when tested. The solution gives a yellow precipitate with potassium chromate. The salt is (a) \(\mathrm{BaS}_{2} \mathrm{O}_{3}\) (b) \(\mathrm{CuSO}_{4}\) (c) PhS O (d) NiSO

Which of the following compounds on reaction with \(\mathrm{NaOH}\) and \(\mathrm{Na}_{2} \mathrm{O}_{2}\) gives yellow colour? (a) \(\mathrm{Zn}(\mathrm{OH})_{2}\) (b) \(\mathrm{Cr}(\mathrm{OH})_{3}\) (c) \(\mathrm{Al}(\mathrm{OH})_{3}\) (d) none of these

A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the solution, a white precipitate is obtained which does not dissolve in dil \(\mathrm{HNO}_{3}\). The anion could be (a) \(\mathrm{Cl}^{-}\) (b) \(\mathrm{S}^{2-}\) (c) \(\mathrm{CO}_{3}^{2-}\) (d) \(\mathrm{SO}_{4}^{2-}\)

Mark the correct statement. (a) V group basic radicals precipitate as carbonates (b) IV group basic radicals precipitate as sulphides (c) I group basic radicals precipitate as chlorides (d) all the above statements are correct

A metal salt solution gives a yellow precipitate with silver nitrate. The precipitate dissolves in dilute nitric acid as well as in ammonium hydroxide. The solution contains (a) iodide (b) chromate (c) phosphate (d) bromide

A mixture of two salts is not water soluble but dissolves completely in dil. HCl to form a colourless solution. The mixture could be (a) \(\mathrm{BaCO}_{3}\) and \(\mathrm{ZnS}\) (b) \(\mathrm{AgNO}_{3}\) and \(\mathrm{KBr}\) (c) \(\mathrm{Mn}\left(\mathrm{NO}_{3}\right)_{2}\) and \(\mathrm{MgSO}_{4}\) (d) \(\mathrm{FeCl}_{3}\) and \(\mathrm{CaCO}_{3}\)

Three separate samples of a solution of single salt gave these results. One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. \(\mathrm{NaCl}\) and one formed a black precipitate with \(\mathrm{H}_{2} \mathrm{~S} .\) The salt could be (a) \(\mathrm{AgNO}_{3}\) (b) \(\mathrm{MnSO}_{4}\) (c) \(\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}\) (d) \(\mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2}\)

The brown ring test for \(\mathrm{NO}_{2}^{-}\)and \(\mathrm{NO}_{3}^{-}\)is due to the formation of complex ion with formula (a) \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) (b) \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{NO}\right]^{2+}\) (c) \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)(\mathrm{NO})_{5}\right]^{2+}\) (d) \(\left[\mathrm{Fe}(\mathrm{NO})(\mathrm{CN})_{5}\right]^{2-}\)

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 \(\dot{\mathrm{CuSO}_{4}}\) solution gives a blue colour. Y is (a) \(\mathrm{Mg}_{3} \mathrm{~N}_{2}\) (b) \(\mathrm{MgO}\) (c) \(\mathrm{NH}_{3}\) (d) \(\mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}\)

When \(\mathrm{H}_{2} \mathrm{~S}\) gas is passed through the HCl containing aqueous solution of \(\mathrm{CuCl}_{2}, \mathrm{HgCl}_{2}, \mathrm{BiCl}_{3}\) and \(\mathrm{CoCl}_{2}\), it does not precipitate out (a) \(\operatorname{CoS}\) (b) \(\mathrm{HgS}\) (c) \(\mathrm{CuS}\) (d) \(\mathrm{Bi}_{2} \mathrm{~S}_{3}\)

Consider the following observation \(\mathrm{M}^{\mathrm{n}+}+\mathrm{HCl} \longrightarrow \mathrm{white}\) precipitate \(\stackrel{\Delta}{\longrightarrow}\) Water soluble The metal ion \(\mathrm{M}^{\mathrm{n}+}\) will be (a) \(\mathrm{Pb}^{2+}\) (b) \(\mathrm{Hg}^{2+}\) (c) \(\mathrm{Sn}^{2+}\) (d) \(\mathrm{Ag}^{+}\)

In qualitative analysis, in order to detect second group basic radical, \(\mathrm{H}_{2} \mathrm{~S}\) gas is passed in the presence of dil. \(\mathrm{HCl}\) to (a) decrease the dissociation of \(\mathrm{H}_{2} \mathrm{~S}\) (b) increase the dissociation of salt solution (c) decrease the dissociation of the salt solution (d) increase the dissociation of \(\mathrm{H}_{2} \mathrm{~S}\)

A light greenish coloured salt was soluble in water. On passing \(\mathrm{H}_{2} \mathrm{~S}\) into the solution, a black ppt. was obtained which dissolved readily in \(\mathrm{HCl}\). The metal ion present is (a) \(\mathrm{Fe}^{2+}\) (b) \(\mathrm{Mn}^{2+}\) (c) \(\mathrm{Ni}^{2+}\) (d) \(\mathrm{Co}^{2+}\)

A metal nitrate on reaction with KI gives black precipitate and with excess of KI gives orange solution. The metal is (a) \(\mathrm{Hg}^{2+}\) (b) \(\mathrm{Pb}^{2+}\) (c) \(\mathrm{Cu}^{2+}\) (d) \(\mathrm{Bi}^{3+}\)

An aqueous solution of a substance gives a white precipitate on treatment with dil. \(\mathrm{HCl}\) which dissolves on heating. When \(\mathrm{H}_{2} \mathrm{~S}\) is passed through the hot acidic solution, a black precipitate is obtained. The substance is a (a) \(\mathrm{Ag}^{+}\)salt (b) \(\mathrm{Cu}^{2+}\) salt (c) \(\mathrm{Pb}^{2+}\) salt (d) \(\mathrm{Hg}_{2}{\underline{\phantom{xx}}}^{2+}\) salt

Identify the correct order of solubility of \(\mathrm{Na}_{2} \mathrm{~S}, \mathrm{CuS}\) and \(\mathrm{ZnS}\) in aqueous medium. (a) \(\mathrm{Na}_{2} \mathrm{~S}>\mathrm{CuS}>\mathrm{ZnS}\) (b) \(\mathrm{Na}_{2} \mathrm{~S}>\mathrm{ZnS}>\mathrm{CuS}\) (c) \(\mathrm{CuS}>\mathrm{ZnS}>\mathrm{Na}_{2} \mathrm{~S}\) (d) \(\mathrm{ZnS}>\mathrm{Na}_{2} \mathrm{~S}>\mathrm{CuS}\)

Which of the following statement is correct? (a) \(\mathrm{Fe}^{3+}\) gives red colour with potassium ferrocyanide (b) \(\mathrm{Fe}^{3+}\) gives brown colour with potassium ferricyanide (c) \(\mathrm{Fe}^{2+}\) gives brown colour with ammonium thiocyanate (d) \(\mathrm{Fe}^{2+}\) gives blue colour with potassium ferricyanide

Ammonium dichromate is used in some fire works. The green coloured powder blown in the air is (a) \(\mathrm{CrO}_{3}\) (b) \(\mathrm{Cr}_{2} \mathrm{O}_{3}\) (c) \(\mathrm{Cr}\) (d) \(\mathrm{CrO}\left(\mathrm{O}_{2}\right)\)

The only cations present in a slightly acidic solution are \(\mathrm{Fe}^{3+}, \mathrm{Zn}^{2+}\) and \(\mathrm{Cu}^{2+}\). The reagent that when added in excess of this solution would identify and separate \(\mathrm{Fe}^{3+}\) in one step is (a) \(2 \mathrm{M} \mathrm{HCl}\) (b) \(6 \mathrm{M} \mathrm{NaOH}\) (c) \(6 \mathrm{M} \mathrm{NH}_{3}\) (d) \(\mathrm{H}_{2} \mathrm{~S}\) gas

A substance on treatment with dilute \(\mathrm{H}_{2} \mathrm{SO}_{4}\) liberates a colourless gas which produces (i) turbidity with baryta water and (ii) turns acidified dichromate solution green. These reactions indicate the presence of (a) \(\mathrm{CO}_{3}^{2-}\) (b) \(\mathrm{S}^{2-}\) (c) \(\mathrm{SO}_{3}^{2-}\) (d) \(\mathrm{NO}_{2}^{-}\)

The reagents, \(\mathrm{NH}_{4} \mathrm{Cl}\) and aqueous \(\mathrm{NH}_{3}\) will precipitate (a) \(\mathrm{Ca}^{2+}\) (b) \(\mathrm{Al}^{3+}\) (c) \(\mathrm{Mg}^{2+}\) (d) \(\mathrm{Zn}^{2+}\)

What product is formed by mixing the solution of \(\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\) with the solution of \(\mathrm{FeCl}_{3} ?\) (a) ferro-ferricyanide (b) ferric-ferrocyanide (c) ferri-ferricyanide (d) none of these

Which one among the following pairs of ions can not be separated by \(\mathrm{H}_{2} \mathrm{~S}\) in dilute hydrochloric acid? (a) \(\mathrm{Bi}^{3+}, \mathrm{Sn}^{4+}\) (b) \(\mathrm{Al}^{3+}, \mathrm{Hg}^{2+}\) (c) \(\mathrm{Zn}^{2+}, \mathrm{Cu}^{2+}\) (d) \(\mathrm{Ni}^{2+}, \mathrm{Cu}^{2+}\)

Which is not true about Libermann nitroso test? (a) Here the blue colour is due to formation of sodium salt of indophenol (b) It is given by nitrophenols (c) It is also given by \(p\)-substituted phenols (d) Both (b) and (c)

In which pair, both the compounds show iodoform test? (a) Acetone and acetophenone (b) Acetophenone and benzophenone (c) Acetone and benzophenone (d) Ethanol and acetone

Which is correct statement here? (1) Glacial acetic acid is used as a solvent in the preparation of p-nitroacetanilide. (2) Potash alum is used as a mordant in dyeing. (3) Potassium alum is used to remove positively charged impurities from water. (4) Iodoform has antiseptic properties also. (a) 2 and 4 (b) 1,3 and 4 (c) 1 and 3 (d) 1,2 and 4

Which is incorrect here? (1) Heat of neutralization for strong acid and strong base is always less than \(13.7 \mathrm{~kJ}\). (2) Aniline yellow can also be used to prepare other dyes. (3) Phenolphthalein can be used as an indicator in the titration of strong acid and weak base (4) Methyl orange works in the range of \(3.1-4.4\). (a) 2 and 4 (b) 2 and 3 (c) 1 and 3 (d) 3 and 4

In the titration between oxalic acid and \(\mathrm{KMnO}_{4}\) if \(\mathrm{H}_{2} \mathrm{SO}_{4}\) is not used in excess (a) A brown precipitate due to \(\mathrm{MnO}_{2}\) is formed (b) A red precipitate is formed. (c) There is not effect (d) A yellow precipitate is formed

Which of the following reaction is given by a primary amine? (1) Carbyl amine reaction (2) Mustard oil reaction (3) Reaction with ceric ammonium nitrate (4) Diazotization (a) 3 and 4 (b) 1,2 and 3 (c) 1,2 and 4 (d) 2 and 3

Phenol and benzoic acid can be distinguished by which tests? (1) Libermann nitroso test (2) Reaction with \(\mathrm{NaHCO}_{3}\) (3) Reaction with \(\mathrm{NaOH}\) (4) Ferric chloride test (a) 1,2 and 3 (b) 1,2 and 4 (c) 1,3 and 4 (d) 2,3 and 4

A green crystalline compound shows the following tests: (i) Its aqueous solution gives a dense white precipitate with Barium chloride solution (ii) Its aqueous solution gives a rose-red precipitate with dimethyl glyoxime and \(\mathrm{NH}_{4} \mathrm{OH}\). The compound is (a) \(\mathrm{NiSO}_{4}\) (b) \(\mathrm{FeSO}_{4}\) (c) \(\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}\) (d) \(\mathrm{FeCl}_{3}\)

\([\mathrm{X}]+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow[\mathrm{Y}]\), a colourless gas with irritating smell. \([\mathrm{Y}]+\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow\) green solution. \([\mathrm{X}]\) and \([\mathrm{Y}]\) are (a) \(\mathrm{SO}_{3}^{-2}, \mathrm{SO}_{2}\) (b) \(\mathrm{Cl}^{-}, \mathrm{HCl}\) (c) \(\mathrm{S}^{-2}, \mathrm{H}_{2} \mathrm{~S}\) (d) \(\mathrm{CO}_{3}^{-2}, \mathrm{CO}_{2}\)

A gas ' \(X\) ' is passed through water to form a saturated solution. The aqueous solution on treatment with the \(\mathrm{AgNO}_{3}\) gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of a colourless gas ' \(\mathrm{Y}\) '. Identify ' \(\mathrm{X}\) ' and ' \(\mathrm{Y}\) '. (a) \(\mathrm{X}=\mathrm{Cl}_{2}, \mathrm{Y}=\mathrm{H}_{2}\) (b) \(\mathrm{X}=\mathrm{H}_{2}, \mathrm{Y}=\mathrm{Cl}_{2}\) (c) \(\mathrm{X}=\mathrm{Cl}_{2}, \mathrm{Y}=\mathrm{CO}_{2}\) (d) \(\mathrm{X}=\mathrm{CO}_{2}, \mathrm{Y}=\mathrm{Cl}_{2}\)