Chapter 18

Amongst the following, the lowest degree of paramagnetism per mole of the compound at \(298 \mathrm{~K}\) will be shown by (a) \(\mathrm{MnSO}_{4} \cdot 4 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{CuSO}_{4} .5 \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{FeSO}_{4} .6 \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{NiSO}_{4} .6 \mathrm{H}_{2} \mathrm{O}\)

Zn gives \(\mathrm{H}_{2}\) gas with \(\mathrm{H}_{2} \mathrm{SO}_{4}\) and \(\mathrm{HCl}\), but not wit \(\mathrm{HNO}_{3}\) because (a) in electrochemical series, \(\mathrm{Zn}\) is above hydrogen (b) \(\mathrm{NO}_{3}^{-}\)ion is reduced in preference to hydroniur ion (c) \(\mathrm{Zn}\) acts as an oxidizing agent when reacts wit \(\mathrm{HNO}_{3}\) (d) \(\mathrm{HNO}_{3}\) is weaker acid than \(\mathrm{H}_{2} \mathrm{SO}_{4}\) and \(\mathrm{HCl}\)

Among the following statements, the incorrect one is (a) calamine and siderite and carbonates (b) argentite and cuprite are oxides (c) zinc blende and pyrites are sulphides (d) malachite and azurite are ores of copper

Zinc-copper couple that can be used as a reducing agent is obtained by (a) zinc coated with copper (b) zinc and copper wires welded together (c) mixing zinc dust and copper gauze (d) copper coated with zinc

Anhydrous ferric chloride is prepared by (a) heating hydrated ferric chloride at a high temperature in a stream of air (b) heating metallic iron in a stream of dry chlorine gas (c) reaction of ferric oxide with hydrochloric acid (d) reaction of metallic iron with hydrochloric acid

Mixture of \((\mathrm{X})=0.02\) moles of \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right] \mathrm{Br}\) and \(0.02\) mole of \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Br}\right] \mathrm{SO}_{4}\) was prepared in 2 litre of solution 1 litre of mixture \((\mathrm{X})+\) excess \(\mathrm{AgNO}_{3} \longrightarrow(\mathrm{Y})\) 1 litre of mixture \((\mathrm{X})+\) excess \(\mathrm{BaCl}_{2} \longrightarrow(\mathrm{Z})\) (a) \(0.01,0.01\) (b) \(0.02,0.01\) (c) \(0.01,0.02\) (d) \(0.02,0.02\)

Copper is extracted from copper pyrites ore by heating in a blast furnace. The method is based on the principle that (a) copper has less affinity for oxygen than sulphur at high temperature (b) sulphur has less affinity for oxygen at high temperature (c) iron has less affinity for oxygen than sulphur at high temperature (d) copper has more affinity for oxygen than sulphur at high temperature

Mixture of \((\mathrm{X})=0.02\) moles of \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right] \mathrm{Br}\) and \(0.02\) mole of \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Br}\right] \mathrm{SO}_{4}\) was prepared in 2 litre of solution 1 litre of mixture \((\mathrm{X})+\mathrm{excess} \mathrm{AgNO}_{3} \longrightarrow(\mathrm{Y})\) 1 litre of mixture \((\mathrm{X})+\) excess \(\mathrm{BaCl}_{2} \longrightarrow(\mathrm{Z})\) (a) \(0.01,0.01\) (b) \(0.02,0.01\) (c) \(0.01,0.02\) (d) \(0.02,0.02\)

For which of the following metals may be hydrometallurgical extractive method be employed? (a) copper (b) iron (c) chromium (d) tin

Pick out the incorrect statement among the following. (1) ferric alum is commonly known as Mohr's salt (2) cast iron cannot be welded (3) heating steel to a high temperature followed by quick quenching in water is called annealing (4) alnico is used for making utensils and automobile parts. (a) \(1,2,3\) (b) 1,3 (c) 2,4 (d) \(1,3,4\)

Which of the following are the advantages of using oxygen in place of air in steel industry? (1) it gives more pure product (2) the surface is free from nitrides (3) it makes the procedure faster, that is, more production (4) larger quantities can also be handled (a) 1,2 and 3 (b) 2 and 4 only (c) 2,3 and 4 (d) \(1,2,3\) and 4

When dilute \(\mathrm{HCl}\) is added to a solution of substance (X) which is water soluble, a white precipitate \((\mathrm{Y})\) is formed. Treatment of \((\mathrm{Y})\) with \(\mathrm{NH}_{4} \mathrm{OH}\) turns it black (Z). Treatment of \((\mathrm{Y})\) with \(\mathrm{H}_{2} \mathrm{~S}\) also turns it black. Identify \((X)\) here? (a) \(\mathrm{HgO}\) (b) \(\mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2}\) (c) \(\mathrm{HgSO}_{4}\) (d) \(\mathrm{Hg}_{2}\left(\mathrm{NO}_{3}\right)_{2}\)

A certain metal \(\mathrm{A}\) is boiled in dilute nitric acid to give a salt B and an oxide of nitrogen \(\mathrm{C}\). An aqueous solution of \(\mathrm{B}\) with brine gives a precipitate \(\mathrm{D}\) which is soluble in \(\mathrm{NH}_{4} \mathrm{OH}\). On adding aqueous solution of \(\mathrm{B}\) to hypo solution, a white precipitate \(\mathrm{E}\) is obtained. \(\mathrm{E}\) turns black on standing. Identify A and E here? (a) \(\mathrm{Zn}, \mathrm{Zn}_{2} \mathrm{SO}_{4}\) (b) \(\mathrm{Ag}, \mathrm{Ag}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) (c) \(\mathrm{Ag}, \mathrm{Ag}_{2} \mathrm{SO}_{4}\) (d) \(\mathrm{Fe}, \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}\)

A certain metal \(\mathrm{A}\) is boiled in dilute nitric acid to give a salt B and an oxide of nitrogen \(\mathrm{C}\). An aqueous solution of \(\mathrm{B}\) with brine gives a precipitate \(\mathrm{D}\) which is soluble in \(\mathrm{NH}_{4} \mathrm{OH}\). On adding aqueous solution of \(\mathrm{B}\) to hypo solution, a white precipitate \(\mathrm{E}\) is obtained. \(\mathrm{E}\) turns black on standing. Identify A and E here? (a) \(\mathrm{Zn}, \mathrm{Zn}_{2} \mathrm{SO}_{4}\) (b) \(\mathrm{Ag}, \mathrm{Ag}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) (c) \(\mathrm{Ag}, \mathrm{Ag}_{2} \mathrm{SO}_{4}\) (d) \(\mathrm{Fe}, \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}\)

Compound \(\mathrm{X}\) (1) on strongly heating it gives two oxides of sulphur. (2) on adding aqueous \(\mathrm{NaOH}\) solution to its aqueous solution, a dirty green precipitate is obtained which starts turning brown on exposure to air. Identify X here. (a) \(\mathrm{CuSO}_{4} .5 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{FeSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{ZnSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{Ag}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\)

A solution, when diluted with water and boiled, gives a white precipitate. On addition of excess \(\mathrm{NH}_{4} \mathrm{Cl} /\) \(\mathrm{NH}_{4} \mathrm{OH}\), the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in \(\mathrm{NH}_{4} \mathrm{OH} / \mathrm{NH}_{4} \mathrm{Cl}\) (a) \(\mathrm{Zn}(\mathrm{OH})_{2}\) (b) \(\mathrm{Al}(\mathrm{OH})_{3}\) (c) \(\mathrm{Mg}(\mathrm{OH})\) (d) \(\mathrm{Ca}(\mathrm{OH})\)

Which compound is formed when excess of \(\mathrm{KCN}\) is added to an aqueous solution of copper sulphate? (a) \(\mathrm{Cu}(\mathrm{CN})_{2}\) (b) \(\mathrm{K}_{2}\left[\mathrm{Cu}(\mathrm{CN})_{6}\right]\) (c) \(\mathrm{K}\left[\mathrm{Cu}(\mathrm{CN})_{2}\right]\) (d) \(\mathrm{K}_{3}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]\)

A is a coloured crystalline solid which is easily soluble in water. Addition of aqueous KCN gives a precipitate which dissolves in excess of reagent whereas addition of KI aqueous solution gives a white grey precipitate with the liberation of iodine. On gently heating, A loses \(80 \%\) of its water of crystallization. Identify A here? (a) \(\mathrm{ZnSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{FeSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\)

Which of the following alloys contain \(\mathrm{Cu}\) and \(\mathrm{Zn} ?\) 1\. bronze 2\. brass 3\. gun metal 4\. type metal (a) \(2,3,4\) (b) \(1,2,3\) (c) 12 (d) all

A white, water insoluble solid A turns yellow on heating and becomes white on cooling. A gives a clear solution B when treated with dilute \(\mathrm{HCl}\) or \(\mathrm{NaOH}\). When \(\mathrm{H}_{2} \mathrm{~S}\) is passed through solution \(\mathrm{B}\), and made neutral, a white precipitate \(\mathrm{C}\) is formed. Identify A? (a) \(\mathrm{ZnO}\) (b) \(\mathrm{CuO}\) (c) \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) (d) \(\mathrm{Ag}_{2} \mathrm{O}\)

Match the following: List-I List-II 1\. Bell metal (i) Cu: \(60 \%-80 \%, \mathrm{Zn}: 20 \%-40 \%\) 2\. Gun metal (ii) \(\mathrm{Cu}: 75 \%-90 \%, \mathrm{Sn}: 10 \%-25 \%\) 3\. Bronze (iii) \(\mathrm{Cu}: 88 \%, \mathrm{Sn}: 10 \%, \mathrm{Zn}: 2 \%\) 4\. Brass (iv) Cu: 80\% Sn: \(20 \%\) The correct matching is: 1 2 3 4 (a) (iv) (iii) (ii) (i) (b) (iii) (iv) (ii) (i) (c) (iv) (ii) (i) (iii) (d) (iii) (iv) (i) (ii)

Which of the following statement is correct with reference to the ferrous and ferric ions? 1\. \(\mathrm{Fe}^{3+}\) gives brown colour with potassium ferricyanide 2\. \(\mathrm{Fe}^{2+}\) gives blue precipitate with potassium ferricyanide 3\. \(\mathrm{Fe}^{3+}\) gives red colour with potassium thiocyanate 4\. \(\mathrm{Fe}^{2+}\) gives brown colour with ammonium thiocyanate. (a) 1,4 (b) 1,2 (c) 2,3 (d) all of these

A colourless water soluble salt \(X\) on heating gives brown gas and leaves a metallic residue. Solution of \(X\) gives brick red precipitate with solution of \(\mathrm{K}_{2} \mathrm{CrO}_{4}\). An ammonical solution of \(X\) gives a silver mirror with formic acid. Salt \(X\) is used in making indelible election ink. Identify the salt \(X\) here? (a) \(\mathrm{AgCl}\) (b) \(\mathrm{HgNO}_{3}\) (c) \(\mathrm{AgNO}_{3}\) (d) \(\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}\)

Match the following: List-I List-II 1\. Nichrome (i) \(\mathrm{Pb}, \mathrm{Bi}, \mathrm{Sn}, \mathrm{Cd}\) 2\. Type metal (ii) \(\mathrm{Pb}, \mathrm{Sb}, \mathrm{Sn}\) 3\. Wood's metal (iii) \(\mathrm{Cu}, \mathrm{Al}, \mathrm{Zn}\) 4\. Devarda's alloy (iv) \(\mathrm{Fe}, \mathrm{Ni}, \mathrm{Cr}\)The correct matching is 1 2 3 (a) (ii) (i) (iii) (iv) (b) (iii) (iv) (ii) (i) (c) (iv) (ii) (i) (iii) (d) (iii) (iv) (i) (ii)

In the process of extraction of gold roasted gold ore \(+\mathrm{CN}^{-}+\mathrm{H}_{2} \mathrm{O} \stackrel{\mathrm{O}_{2} \rightarrow}[\mathrm{X}]+\mathrm{OH}^{-}\) \([\mathrm{X}]+\mathrm{Zn} \longrightarrow[\mathrm{Y}]+\mathrm{Au}\) \([\mathrm{X}]\) and \([\mathrm{Y}]\) are (a) \([\mathrm{X}]=\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-},[\mathrm{Y}]=\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{-2}\) (b) \([\mathrm{X}]=\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{-3},[\mathrm{Y}]=\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{-2}\) (c) \([\mathrm{X}]=\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-},[\mathrm{Y}]=\left[\mathrm{Zn}(\mathrm{CN})_{6}\right]^{-4}\) (d) \([\mathrm{X}]=\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{-},[\mathrm{Y}]=\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{-2}\)

Roasting of copper pyrites is done (a) To oxidize free sulphur (b) Ro remove moisture (c) To remove volatile organic impurities (d) To decompose sulphides into oxides.

Which of the following statements is/are correct for electrolytic refining? (a) The electric current used is \(\mathrm{AC}\) (b) On account of electrolysis, the metal is indirectly transferred from anode to cathode (c) The impurity metal is made the anode while a thin sheet of pure metal is used as the cathode (d) The electrolyte used is a covalent compound of metal

vSilver is a soft metal. It is hardened by alloying it wi small amounts of (a) \(\mathrm{Cu}\) (b) \(\mathrm{Fe}\) (c) \(\mathrm{Ni}\) (d) \(\mathrm{Sn}\)

Silver is a soft metal. It is hardened by alloying it with small amounts of (a) \(\mathrm{Cu}\) (b) \(\overline{\mathrm{Fe}}\) (c) \(\mathrm{Ni}\) (d) \(\mathrm{Sn}\)

Which of the following are correctly matched? (a) Zone refining - Ultra pure Ge (b) Leaching - Extraction of \(\mathrm{Au}, \mathrm{Ag}\) (c) Cyanide process - Extraction of Au (d) Electrolyte reduction - Extraction of Al

In which of the following pair (s), the minerals are converted into metals by self reduction ? (a) \(\mathrm{Cu}_{2} \mathrm{~S}, \mathrm{HgS}\) (b) \(\mathrm{Ag}_{2} \mathrm{~S}, \mathrm{ZnS}\) (c) \(\mathrm{PbS}, \mathrm{ZnS}\) (d) \(\mathrm{Cu}, \mathrm{S}, \mathrm{PbS}\)

The following methods are not advisable to extract zinc from its oxide ore. (a) Reduction with aluminium (b) Reduction with \(\mathrm{H}_{2}\) (c) Electrolytic reduction (d) Reduction with carbon

In the process of extraction of gold Roasted gold ore \(+\mathrm{CN}^{-}+\mathrm{H}_{2} \mathrm{O} \stackrel{\mathrm{O}_{2}}{\longrightarrow}[\mathrm{X}]+\mathrm{OH}^{-}\) \([\mathrm{X}]+\mathrm{Zn} \longrightarrow[\mathrm{Y}]+\mathrm{Au}\) Identify the complexes of \([\mathrm{X}]\) and \([\mathrm{Y}]\) (a) \(\mathrm{Y}=\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}\) (b) \(\mathrm{X}=\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{3-}\) (c) \(\mathrm{X}=\left[\mathrm{Au}(\mathrm{CN})_{2}\right]\) (d) \(\mathrm{Y}=\left[\mathrm{Zn}(\mathrm{CN})_{6}\right]^{4-}\)

The method of thermal decomposition cannot be used for (a) \(\mathrm{Au}\) (b) \(\mathrm{Hg}\) (c) \(\mathrm{Mg}\)

Match the following \begin{tabular}{ll} \hline Column-I & Column-II \\ \hline (a) Asbestos & (p) Calcium \\ (b) Willemite & (q) Lead \\ (c) Anglesite & (r) Silicate \\ (d) Diaspore & (s) Aluminium \\ & (t) Sulphate \\ \hline \end{tabular}

The number of sulphide minerals of the following is Cuprite, Argentite, Carnallite, Magnesite, Galena, Black Jack.

Among the metals, Ti, V, W, Zr, Th and Au, the no. of metals purified by van Arkel method is

\text { Among the following minerals, siderite, malachite, }cerussite, anglessite, smithsonite, diaspore, mica and corundum, the number of carbonate minerals is

When the sample of copper with zinc impurity is to be purified by electrolysis the appropriate electrodes are [2002] Cathode \(\quad\) Anode (a) pure zinc \(\quad\) pure copper (b) pure copper impure sample (c) impure zinc impure sample (d) impure sample pure copper

Which one of the following nitrates will leave behind a metal on strong heating? [2003] (a) ferric nitrate (b) copper nitrate (c) manganese nitrate (d) silver nitrate

Which one of the following ores is best concentrated by froth-floatation method? (a) cassiterite (b) galena (c) malachite (d) magnetite

Excess of KI react with \(\mathrm{CuSO}_{4}\) solution and then \(\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) solution is added to it. Which of the following statements is incorrect for this reaction? [2004] (a) \(\mathrm{Cu}_{2} \mathrm{I}_{2}\) is formed (b) \(\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) is oxidized (c) \(\mathrm{CuI}\), is formed (d) Evolved \(\mathrm{I}_{2}\) is reduced

Among the properties (A) reducing (B) oxidizing (C) complexing, the set of properties shown by \(\mathrm{CN}\) - ion towards metal species is [2004] (a) A, B (b) \(\mathrm{B}, \mathrm{C}\) (c) \(\mathrm{C}, \mathrm{A}\) (d) \(\mathrm{A}, \mathrm{B}, \mathrm{C}\)

During the process of electrolytic refining of copper some metals present as impurity settle as anode mud. These are \(\quad[\mathbf{2 0 0 5}]\) (a) \(\mathrm{Ag}\) and \(\mathrm{Au}\) (b) \(\mathrm{Pb}\) and \(\mathrm{Zn}\) (c) \(\mathrm{Fe}\) and \(\mathrm{Ni}\) (d) \(\mathrm{Sn}\) and \(\mathrm{A} \mathrm{g}\)

Heating mixture of \(\mathrm{Cu}_{2} \mathrm{O}\) and \(\mathrm{Cu}_{2} \mathrm{~S}\) will give (a) \(\mathrm{Cu}+\mathrm{SO}_{2}\) (b) \(\mathrm{Cu}+\mathrm{SO}_{3}\) (c) \(\mathrm{CuO}+\mathrm{CuS}\) (d) \(\mathrm{Cu}_{2} \mathrm{SO}_{3}\)

Which method of purification is represented by the following equation: \((\mathrm{s})+2 \mathrm{I}_{2}(\mathrm{~g}) \stackrel{523 \mathrm{~K}}{\longrightarrow} \mathrm{Ti} \mathrm{I}_{4}(\mathrm{~g}) \stackrel{120 \mathrm{~K}}{\longrightarrow} \mathrm{Ti}(\mathrm{s})+2 \mathrm{I}_{2}(\mathrm{~g})\) [2012] (a) Poling (b) Cupellation (c) Zone refining (d) Van Arkel

Iron exhibits \(+2\) and \(+3\) oxidation states. Which of the following statements about iron is incorrect? [2012] (a) Ferrous compounds are less volatile than the corresponding ferric compounds (b) Ferrous compounds are relatively more ionic than the corresponding ferric compounds. (c) Ferrous oxide is more basic in nature than the ferric oxide (d) Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds

Which series of reactions correctly represents chemical relations related to iron and its compound? \([2014]\) (a) \(\mathrm{Fe} \stackrel{\mathrm{C}_{2} \text { heat }}{\longrightarrow} \mathrm{FeCl}_{3} \stackrel{\text { het air }}{\longrightarrow}\) \(\mathrm{FeCl}_{2} \stackrel{\mathrm{Zn}}{\longrightarrow} \mathrm{Fe}\) (b) \(\mathrm{Fe} \stackrel{\mathrm{O}_{3} \mathrm{haat}}{\longrightarrow} \mathrm{FeCl}_{3} \stackrel{\mathrm{CO}, 600^{\circ} \mathrm{C}}{\longrightarrow} \mathrm{FeO}\) \(\stackrel{\cos w^{2} \mathrm{C}}{\longrightarrow} \mathrm{Fe}\)c) \(\mathrm{Fe} \stackrel{\mathrm{d} \mathrm{H}_{\mathrm{H}} \mathrm{SO}_{4}}{\longrightarrow} \mathrm{FeSO}_{4} \stackrel{\mathrm{H}, \mathrm{So}_{4}, \mathrm{O}_{3}}{\longrightarrow}\) \(\mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{2} \stackrel{\text { Heat }}{\longrightarrow} \mathrm{Fe}\) d) \(\mathrm{Fe} \stackrel{\mathrm{O}_{\mathrm{b} \mathrm{ben}}}{\longrightarrow} \mathrm{FeSO}_{4} \stackrel{\mathrm{diH}_{2} \mathrm{So}_{4}}{\longrightarrow}\) \(\mathrm{FeSO}_{4} \stackrel{\text { Heart }}{\longrightarrow} \mathrm{Fe}\)

Which of the following are is best concentrated by froth floatation method? a) Siderite (b) Galena c) Malachite (d) magnetite

Galvanization is applying a coating of? [2016] (a) \(\mathrm{Cu}\) (b) \(\mathrm{Zn}\) (c) \(\overline{\mathrm{Cr}}\) (d) \(\mathrm{Pb}\)