Extraction of Metals by both Oxidation and Reduction – Extraction of Silver and Gold
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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321057 Impurities of \(\mathrm{Cu}\) and \(\mathrm{Ag}\) from gold are removed by

1 boiling impure gold with dil. \(\mathrm{H}_{2} \mathrm{SO}_{4}\)
2 boiling impure gold with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\)
3 electrolytically
4 Both (2) and (3)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321058 During the extraction of gold the following reactions take place.
\({\text{Au + C}}{{\text{N}}^{\text{ - }}}{\text{ + }}{{\text{H}}_{\text{2}}}{\text{O}}\mathop \to \limits^{{{\text{O}}_{\text{2}}}} {\text{[X]}}\)
\({\text{[X] + Zn}} \to {\text{[Y] + Au}}\)
\(\mathrm{\mathrm{X}}\) and \(\mathrm{\mathrm{Y}}\) are respectively

1 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}}\)and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{6}\right]^{4-}}\)
2 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{2-}}\) and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}}\)
3 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{3-}}\) and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}}\)
4 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}}\)and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}}\)
MHTCET - 2007
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321059 In the extraction of chlorine by electrolysis of brine

1 Oxidation of \(\mathrm{\mathrm{Cl}^{-}}\)ion to chlorine gas occurs
2 Reduction of \(\mathrm{\mathrm{Cl}^{-}}\)ion to chlorine gas occurs
3 For overall reaction \(\mathrm{\Delta G^{\circ}}\) has negative value
4 A displacement reaction takes place
NCERT Exemplar
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321060 In the cyanide process involving extraction of silver, zinc is used industrially as a(an):

1 Oxidizing agent
2 Reducing agent
3 Solvent
4 Solvating agent
For More Updates join with Us
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321057 Impurities of \(\mathrm{Cu}\) and \(\mathrm{Ag}\) from gold are removed by

1 boiling impure gold with dil. \(\mathrm{H}_{2} \mathrm{SO}_{4}\)
2 boiling impure gold with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\)
3 electrolytically
4 Both (2) and (3)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321058 During the extraction of gold the following reactions take place.
\({\text{Au + C}}{{\text{N}}^{\text{ - }}}{\text{ + }}{{\text{H}}_{\text{2}}}{\text{O}}\mathop \to \limits^{{{\text{O}}_{\text{2}}}} {\text{[X]}}\)
\({\text{[X] + Zn}} \to {\text{[Y] + Au}}\)
\(\mathrm{\mathrm{X}}\) and \(\mathrm{\mathrm{Y}}\) are respectively

1 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}}\)and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{6}\right]^{4-}}\)
2 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{2-}}\) and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}}\)
3 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{3-}}\) and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}}\)
4 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}}\)and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}}\)
MHTCET - 2007
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321059 In the extraction of chlorine by electrolysis of brine

1 Oxidation of \(\mathrm{\mathrm{Cl}^{-}}\)ion to chlorine gas occurs
2 Reduction of \(\mathrm{\mathrm{Cl}^{-}}\)ion to chlorine gas occurs
3 For overall reaction \(\mathrm{\Delta G^{\circ}}\) has negative value
4 A displacement reaction takes place
NCERT Exemplar
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321060 In the cyanide process involving extraction of silver, zinc is used industrially as a(an):

1 Oxidizing agent
2 Reducing agent
3 Solvent
4 Solvating agent
NEET DIGITAL LIBRARY
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321057 Impurities of \(\mathrm{Cu}\) and \(\mathrm{Ag}\) from gold are removed by

1 boiling impure gold with dil. \(\mathrm{H}_{2} \mathrm{SO}_{4}\)
2 boiling impure gold with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\)
3 electrolytically
4 Both (2) and (3)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321058 During the extraction of gold the following reactions take place.
\({\text{Au + C}}{{\text{N}}^{\text{ - }}}{\text{ + }}{{\text{H}}_{\text{2}}}{\text{O}}\mathop \to \limits^{{{\text{O}}_{\text{2}}}} {\text{[X]}}\)
\({\text{[X] + Zn}} \to {\text{[Y] + Au}}\)
\(\mathrm{\mathrm{X}}\) and \(\mathrm{\mathrm{Y}}\) are respectively

1 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}}\)and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{6}\right]^{4-}}\)
2 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{2-}}\) and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}}\)
3 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{3-}}\) and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}}\)
4 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}}\)and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}}\)
MHTCET - 2007
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321059 In the extraction of chlorine by electrolysis of brine

1 Oxidation of \(\mathrm{\mathrm{Cl}^{-}}\)ion to chlorine gas occurs
2 Reduction of \(\mathrm{\mathrm{Cl}^{-}}\)ion to chlorine gas occurs
3 For overall reaction \(\mathrm{\Delta G^{\circ}}\) has negative value
4 A displacement reaction takes place
NCERT Exemplar
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321060 In the cyanide process involving extraction of silver, zinc is used industrially as a(an):

1 Oxidizing agent
2 Reducing agent
3 Solvent
4 Solvating agent
Join With Us for More Updates
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321057 Impurities of \(\mathrm{Cu}\) and \(\mathrm{Ag}\) from gold are removed by

1 boiling impure gold with dil. \(\mathrm{H}_{2} \mathrm{SO}_{4}\)
2 boiling impure gold with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\)
3 electrolytically
4 Both (2) and (3)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321058 During the extraction of gold the following reactions take place.
\({\text{Au + C}}{{\text{N}}^{\text{ - }}}{\text{ + }}{{\text{H}}_{\text{2}}}{\text{O}}\mathop \to \limits^{{{\text{O}}_{\text{2}}}} {\text{[X]}}\)
\({\text{[X] + Zn}} \to {\text{[Y] + Au}}\)
\(\mathrm{\mathrm{X}}\) and \(\mathrm{\mathrm{Y}}\) are respectively

1 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}}\)and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{6}\right]^{4-}}\)
2 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{2-}}\) and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}}\)
3 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]^{3-}}\) and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}}\)
4 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}}\)and \(\mathrm{\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}}\)
MHTCET - 2007
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321059 In the extraction of chlorine by electrolysis of brine

1 Oxidation of \(\mathrm{\mathrm{Cl}^{-}}\)ion to chlorine gas occurs
2 Reduction of \(\mathrm{\mathrm{Cl}^{-}}\)ion to chlorine gas occurs
3 For overall reaction \(\mathrm{\Delta G^{\circ}}\) has negative value
4 A displacement reaction takes place
NCERT Exemplar
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321060 In the cyanide process involving extraction of silver, zinc is used industrially as a(an):

1 Oxidizing agent
2 Reducing agent
3 Solvent
4 Solvating agent
For More Updates join with Us