Chapter 18

Which of the following is used in the extraction of silver? (a) \(\mathrm{NaCN}\) (b) \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) (c) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) (d) \(\mathrm{NaCl}\)

Which of the following gas is evolved when silver reacts with concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4} ?\) (a) \(\mathrm{O}_{2}\) (b) \(\mathrm{SO}_{2}\) (c) \(\mathrm{Ag}_{2} \mathrm{SO}_{4}\) (d) \(\mathrm{H}_{2}\)

With \(\mathrm{NH}_{4} \mathrm{OH}\), the silver nitrate is decomposed to give a brown precipitate of (a) \(\mathrm{Ag}_{2} \mathrm{O}\) (b) \(\mathrm{AgO}\) (c) \(\mathrm{Ag}(\mathrm{OH})_{2}\) (d) \(\mathrm{NH}_{4} \mathrm{NO}_{3}\)

The solubility of \(\mathrm{AgBr}\) in hypo is due to the formation of (a) \(\mathrm{Ag}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) (b) \(\left[\operatorname{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)\right]^{-}\) (c) \(\left[\mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}\right]^{3-}\) (d) \(\mathrm{Ag}_{2} \mathrm{SO}_{3}\)

Which of the following is formed when silver nitrate is treated with caustic soda? (a) \(\mathrm{Ag}_{3} \mathrm{~N}\) (b) \(\mathrm{Ag}\) (c) \(\mathrm{AgNO}_{2}\) (d) \(\mathrm{Ag}_{2} \mathrm{O}\)

Parke's process is used (a) to extract Cu using \(\mathrm{CuFeS}_{2}\) (b) to extract Ag from argenti ferrous lead (c) to extract \(\mathrm{Ag}\) by forming amalgam (d) to extract \(\mathrm{Ag}\) using \(\mathrm{NaCN}\)

In the extraction of silver, \(\mathrm{Ag}_{2} \mathrm{~S}\) is dissolved in (a) \(\mathrm{HNO}_{3}\) (b) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (c) \(\mathrm{HCl}\) (d) \(\mathrm{KCN}\)

In the extraction of silver, \(\mathrm{Ag}_{2} \mathrm{~S}\) is dissolved in (a) \(\mathrm{HNO}_{3}\) (b) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (c) \(\mathrm{HCl}\) (d) \(\mathrm{KCN}\)

Silver containing lead as an impurity is removed by (a) distillation (b) poling (c) levigation (d) cupellation

Which of the following compound of zinc is white in cold and yellow in hot? (a) \(\mathrm{ZnS}\) (b) \(\mathrm{ZnCl}_{2}\) (c) \(\mathrm{ZnSO}_{4}\) (d) \(\mathrm{ZnO}\)

When sodium argentocyanide is treated with zinc dust, silver precipitates because (a) zinc forms a complex readily with cyanide (b) zinc is more electropositive than silver (c) silver is more electropositive than zinc (d) both \(\mathrm{Zn}^{2+}\) and \(\mathrm{Ag}^{+}\)ions have \(\mathrm{d}^{10}\) electronic configuration

Which of the following compound is known as white vitriol? (a) \(\mathrm{ZnSO}_{4^{*}} \cdot 7 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Na}_{2} \mathrm{SO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{CaCO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{MgSO}_{4^{*}} 7 \mathrm{H}_{2} \mathrm{O}\)

The important ore of zinc is (a) cryolite (b) calamine (c) malachite (d) gibbsite

\(\mathrm{Zn}\), on reacting with cold dil. \(\mathrm{HNO}_{3}\) forms (a) \(\mathrm{ZnNO}_{3}\) (b) \(\mathrm{NO}_{2}\) (c) \(\mathrm{NH}_{4} \mathrm{NO}_{3}\) (d) \(\mathrm{NO}\)

Granulated zinc can be obtained by (a) adding molten zinc to water (b) heating zinc from 373 to \(423 \mathrm{~K}\) (c) droping molten zinc drop by drop (d) all of these

Zinc does not show variable valency, because (a) its d-subshell is incomplete (b) it is relatively soft metal (c) its d-subshell is complete (d) it has two electrons in outermost shell \eta. the reaction

Anhydrous zinc chloride is prepared by heating of (a) \(\mathrm{ZnCl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Zn}+\mathrm{HgCl}_{2}\) (c) \(\mathrm{Zn}+\mathrm{Cl}\) (d) both \((\mathrm{b})\) and \((\mathrm{c})\)

During the extraction of zinc, \(\mathrm{ZnO}\) is obtained from zinc blende by (a) poling (b) roasting (c) cupellation (d) electrolytic reduction

Which of the following is formed, when \(\mathrm{H}_{2} \mathrm{~S}\) is passed through the solution of sodium zincate? (a) \(\mathrm{Zn}(\mathrm{OH})_{2}\) (b) \(\mathrm{ZnS}\) (c) \(\mathrm{Na}_{2}\left[\mathrm{Zn}(\mathrm{OH})_{4}\right]\) (d) \(\mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}\)

Which of the following is used in making ointment for curing skin disease? (a) \(\mathrm{ZnCO}_{3}\) (b) \(\mathrm{ZnSO}_{4}\) (c) \(\mathrm{ZnO}\) (d) \(\mathrm{ZnS}\)

Brass is an alloy of (a) \(\mathrm{Cu}\) and \(\mathrm{Sn}\) (b) \(\mathrm{Ag}\) and \(\mathrm{Cu}\) (c) \(\mathrm{Cu}\) and \(\mathrm{Zn}\) (d) \(\mathrm{Sn}\) and \(\mathrm{Zn}\)

Cinnabar is an ore of (a) \(\mathrm{Cu}\) (b) \(\mathrm{Zn}\) (c) \(\mathrm{Hg}\) (d) \(\mathrm{Pb}\)

Which of the following is a calomel? (a) \(\mathrm{HgBr}_{2}\) (b) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\) (c) \(\mathrm{HgCl}\), (d) \(\mathrm{HgSO}_{4}\)

In Nessler's reagent, the ion present is (a) \(\mathrm{HgI}_{4}^{2-}\) (b) \(\mathrm{Hg} \mathrm{I}_{2}^{2-}\) (c) \(\mathrm{Hg}^{+}\) (d) \(\mathrm{Hg}^{2+}\)

Mercury is transported in metal containers made of (a) lead (b) silver (c) aluminium (d) iron

Mercuric iodide dissolves in excess of KI and forms (a) \(\mathrm{Hg}_{2} \mathrm{I}_{2}\) (b) \(\mathrm{Hg}\) (c) \(\mathrm{K}_{2}\left[\mathrm{HgI}_{4}\right]\) (d) \(\mathrm{K}\left[\mathrm{HgI}_{2}\right]\)

When mercury boils with \(\mathrm{H}_{2} \mathrm{SO}_{4}\), then it formed and is liberated. (a) \(\mathrm{Hg}_{2} \mathrm{SO}_{4}, \mathrm{SO}_{2}\) (b) \(\mathrm{HgSO}_{4}, \mathrm{SO}_{2}\) (c) \(\mathrm{HgSO}_{4}, \mathrm{SO}_{3}\) (d) \(\mathrm{HgSO}_{4}, \mathrm{H}_{2}\)

Which of the following is produced when conce trated cinnabar is roasted in the excess of air? (a) \(\mathrm{Hg}\) (b) \(\mathrm{Fe}\) (c) \(\mathrm{Zn}\) (d) \(\mathrm{Al}\)

Which of the following statements is incorrect? (a) lead is refined by electrolysis of PbSiF \(_{6}\). (b) red lead \(\left(\mathrm{Pb}_{3} \mathrm{O}_{4}\right)\) is known as minium (c) yellow lead oxide \((\mathrm{PbO})\) is known as massicot. (d) none of these

A metal gives two chlorides \(\mathrm{A}\) and \(\mathrm{B}\). A gives black precipitate with \(\mathrm{NH}_{3}\) and \(\mathrm{B}\) gives white. With \(\mathrm{KI}, \mathrm{B}\) gives a yellow precipitate, which is soluble in excess of \(\mathrm{KI} . \mathrm{A}\) and \(\mathrm{B}\) are respectively (a) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}, \mathrm{HgCl}_{2}\) (b) \(\mathrm{HgCl}, \mathrm{Hg}_{2} \mathrm{Cl}_{2}\) (c) \(\mathrm{ZnCl}_{2}, \mathrm{HgCl}_{2}\) (d) \(\mathrm{HgCl}_{2}, \mathrm{ZnCl}^{2}\)

Which of the following is formed when mercurous nitrate reacts with \(\mathrm{NaCl}\) ? (a) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Hg}\left(\mathrm{Na}_{2}\right) \mathrm{Cl}\) (c) \(\mathrm{HgCl}_{2}\) (d) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\)

Which of the following acts as an antidote to \(\mathrm{HgCl}_{2}\) poisoning? (a) yellow of egg (b) egg of fish (c) white of egg (d) egg

Lead impurity is removed from silver by? (a) distillation (b) poling (c) lavigation (d) cupellation

Which of the following is formed when mercurous nitrate reacts with \(\mathrm{NaCl}\) ? (a) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Hg}\left(\mathrm{Na}_{2}\right) \mathrm{Cl}\) (c) \(\mathrm{HgCl}_{2}\) (d) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\)

Ferrous ion change to \(\mathrm{X}\) ion, on reacting with acidified hydrogen peroxide. The number of d-electrons present in \(X\) and its magnetic moment (in \(\mathrm{BM})\) are respectively (a) 5 and \(4.9\) (b) 4 and \(5.92\) (c) 6 and \(6.95\) (d) 5 and \(5.92\)

Identify the compound \((\mathrm{X})\) and the condition (Y) her \(\mathrm{PbS} \underset{\text { in air }}{\stackrel{\text { Heat }}{\longrightarrow}(\mathrm{X})+\mathrm{PbS}} \stackrel{(\mathrm{Y})}{\longrightarrow} \mathrm{Pb}+\mathrm{SO}_{2}\) (a) \(\mathrm{X}=\mathrm{PbSO}_{3}, \mathrm{Y}=\) low temperature (b) \(\mathrm{X}=\mathrm{PbO}\) or \(\mathrm{PbSO}_{4}, \mathrm{Y}=\) high temperature (air supply is cut off) (c) \(\mathrm{X}=\mathrm{Pb}_{3} \mathrm{O}_{4}, \mathrm{Y}=\) high temperature (d) \(\mathrm{X}=\mathrm{PbSO}_{4}, \mathrm{Y}=\mathrm{N}_{2}\)

vIn \(\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]^{2-}\), the number of \(\pi\) bonds is (a) 2 (b) 3 (c) 4 (d) 6

Silver chloride dissolves in excess of \(\mathrm{NH}_{4} \mathrm{OH}\). The cation present in this solution is (a) \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{6}\right]^{+}\) (b) \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{4}\right]^{+}\) (c) \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right]^{+}\) (d) \(\mathrm{Ag}^{+}\)

\(\mathrm{Fe}^{3+}\) can be detected by the reaction (1) \(\mathrm{Fe}^{3+}+\left[\mathrm{Fe}^{\mathrm{II}}(\mathrm{CN})_{6}\right]^{4} \longrightarrow \mathrm{Fe}^{\mathrm{III}}\left[\mathrm{Fe}^{\mathrm{ll}}(\mathrm{CN})_{6}\right]\) Deep blue (2) \(\mathrm{Fe}^{3+}+\left[\mathrm{Fe}^{\mathrm{ll}}(\mathrm{CN})_{6}\right]^{3} \longrightarrow \mathrm{Fe}^{\mathrm{Il}}\left[\mathrm{Fe}^{\mathrm{III}}(\mathrm{CN})_{6}\right]\) (3) \(\mathrm{Fe}^{3+}+\mathrm{SCN}^{-} \stackrel{\mathrm{H}_{2} \mathrm{O}}{\mathrm{C}} \begin{gathered}\text { Brown } \\\ {\left[\mathrm{Fe}(\mathrm{SCN})\left(\mathrm{H}_{2} \mathrm{O}\right)_{5}\right]^{2^{+}}}\end{gathered}\) Blood red (a) 1 and 2 only (b) 2 and 3 only (c) 1,2 and 3 (d) 3 only

In nitroprusside ion, iron and NO exist as \(\mathrm{Fe}^{\mathrm{ll}}\) and NO \(^{+}\)rather than \(\mathrm{Fe}^{\mathrm{III}}\) and NO. These forms can be differentiated by (a) estimating the concentration of iron (b) measuring the concentration of \(\mathrm{CN}^{-}\) (c) measuring the solid state magnetic moment (d) thermally decomposing the compound

The chemical processes in the production of steel from haematite ore involve (a) reduction (b) oxidation (c) reduction followed by oxidation (d) oxidation followed by reduction

The chemical composition of 'slag' formed during the smelting process in the extraction of copper is (a) \(\mathrm{Cu}_{2} \mathrm{O}+\mathrm{FeS}\) (b) \(\mathrm{FeSiO}_{3}\) (c) \(\mathrm{CuFeS}_{2}\) (d) \(\mathrm{Cu}_{2} \mathrm{~S}+\mathrm{FeO}\)

\(\mathrm{SnO}\) can be prepared by (1) boiling a stannous chloride solution with \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) (2) heating tin hydroxide in air (3) heating tin oxalate \(\left(\mathrm{SnC}_{2} \mathrm{O}_{4}\right)\) in absence of air (a) 1 and 2 (b) 2 and 3 (c) 1,2 and 3 (d) 1 and 3

The number of moles of \(\mathrm{AgCl}\) precipitated when excess \(\mathrm{AgNO}_{3}\) is added to one mole of \(\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right] \mathrm{Cl}\) is (a) \(3.0\) (b) \(2.0\) (c) \(1.0\) (d) zero

The number of moles of \(\mathrm{AgCl}\) precipitated when excess \(\mathrm{AgNO}_{3}\) is mixed with one mole of \(\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{4}\right.\) \(\left.\mathrm{Cl}_{2}\right] \mathrm{Cl}\) is (a) 4 (b) 3 (c) 2 (d) 1

Which of the following compounds is expected to be coloured? (a) \(\mathrm{Ag}_{2} \mathrm{SO}_{4}\) (b) \(\mathrm{CuF}_{2}\) (c) \(\mathrm{MgF}_{2}\) (d) \(\mathrm{CuCl}\)

When Zn metal is added to \(\mathrm{CuSO}_{4}\) solution, \(\mathrm{Cu}\) is precipitated it is due to (a) ionization of \(\mathrm{CuSO}_{4}\) (b) hydrolysis of \(\mathrm{CuSO}_{4}\) (c) reduction of \(\mathrm{Cu}^{2+}\) (d) oxidation of \(\mathrm{Cu}^{2+}\)

v\(\mathrm{CuSO}_{4}\) decolourize on addition of \(\mathrm{KCN}\), the product is (a) \(\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{2-}\) (b) \(\mathrm{Cu}^{2+}\) gets reduced to form \(\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-}\) (c) \(\mathrm{Cu}(\mathrm{CN})_{2}\) (d) \(\mathrm{CuCN}\)

vFroth floatation process may be used to increase the concentration of the mineral in (a) chalcopyrites (b) bauxite (c) haematite (d) calamine

The black compound formed during the reaction between sodium thiosulphate and silver nitrate is (a) silver sulphite \(\left(\mathrm{Ag}_{2} \mathrm{SO}_{3}\right)\) (b) silver sulphate \(\left(\mathrm{Ag}_{2} \mathrm{SO}_{4}\right)\) (c) silver sulphide \(\left(\mathrm{Ag}_{2} \mathrm{~S}\right)\) (d) silver thiosulphate \(\left(\mathrm{Ag}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\right)\)