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Extraction of Metals by both Oxidation and Reduction – Extraction of Silver and Gold

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321052 Roasted gold ore \( + {\text{C}}{{\text{N}}^ - } + {{\text{H}}_2}{\text{O}}\xrightarrow{{{{\text{O}}_2}}}[{\text{X}}] + {\text{O}}{{\text{H}}^ - }\)
\([{\rm{X}}] + {\rm{Zn}} \to [{\rm{Y}}] + {\rm{Au}}]\) [X] and [Y] are

1 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_2}} \right]^ - };{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_4}} \right]^{2 - }}\)

2 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_4}} \right]^{3 - }};{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_4}} \right]^{2 - }}\)

3 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_2}} \right]^ - };{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_6}} \right]^{4 - }}\)

4 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_4}} \right]^{3 - }};{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_6}} \right]^{4 - }}\)

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321053 Silver containing lead as an impurity is removed
by

1 poling

2 cupellation

3 lavigation

4 distillation

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321054 Select incorrect statement regarding silver extraction process :

1 When the lead-silver alloy is rich in silver, lead is removed by the cupellation process.

2 When the lead-silver alloy is rich in lead, lead is removed by Parke's or Pattinson's process.

3 Zinc forms an alloy with lead, from which lead is separated by distillation.

4 Zinc forms an alloy with silver, from which zinc is separated by distillation.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321055 Gold is extracted by hydrometallurgical process based on its property

1 Of being electropositive

2 Of being less reactive

3 To form salts which are water soluble

4 To form complexes which are water soluble

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321056 The chemical compound formed in the extraction of gold by cyanide process is

1 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]_{(\mathrm{aq})}^{-}}\)

2 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]_{(\mathrm{aq})}^{-3}}\)

3 \(\mathrm{\mathrm{Au}(\mathrm{CN})_{2}}\)

4 \(\mathrm{\mathrm{Au}(\mathrm{OH})}\)

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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321052 Roasted gold ore \( + {\text{C}}{{\text{N}}^ - } + {{\text{H}}_2}{\text{O}}\xrightarrow{{{{\text{O}}_2}}}[{\text{X}}] + {\text{O}}{{\text{H}}^ - }\)
\([{\rm{X}}] + {\rm{Zn}} \to [{\rm{Y}}] + {\rm{Au}}]\) [X] and [Y] are

1 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_2}} \right]^ - };{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_4}} \right]^{2 - }}\)

2 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_4}} \right]^{3 - }};{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_4}} \right]^{2 - }}\)

3 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_2}} \right]^ - };{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_6}} \right]^{4 - }}\)

4 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_4}} \right]^{3 - }};{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_6}} \right]^{4 - }}\)

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321053 Silver containing lead as an impurity is removed
by

1 poling

2 cupellation

3 lavigation

4 distillation

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321054 Select incorrect statement regarding silver extraction process :

1 When the lead-silver alloy is rich in silver, lead is removed by the cupellation process.

2 When the lead-silver alloy is rich in lead, lead is removed by Parke's or Pattinson's process.

3 Zinc forms an alloy with lead, from which lead is separated by distillation.

4 Zinc forms an alloy with silver, from which zinc is separated by distillation.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321055 Gold is extracted by hydrometallurgical process based on its property

1 Of being electropositive

2 Of being less reactive

3 To form salts which are water soluble

4 To form complexes which are water soluble

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321056 The chemical compound formed in the extraction of gold by cyanide process is

1 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]_{(\mathrm{aq})}^{-}}\)

2 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]_{(\mathrm{aq})}^{-3}}\)

3 \(\mathrm{\mathrm{Au}(\mathrm{CN})_{2}}\)

4 \(\mathrm{\mathrm{Au}(\mathrm{OH})}\)

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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321052 Roasted gold ore \( + {\text{C}}{{\text{N}}^ - } + {{\text{H}}_2}{\text{O}}\xrightarrow{{{{\text{O}}_2}}}[{\text{X}}] + {\text{O}}{{\text{H}}^ - }\)
\([{\rm{X}}] + {\rm{Zn}} \to [{\rm{Y}}] + {\rm{Au}}]\) [X] and [Y] are

1 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_2}} \right]^ - };{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_4}} \right]^{2 - }}\)

2 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_4}} \right]^{3 - }};{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_4}} \right]^{2 - }}\)

3 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_2}} \right]^ - };{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_6}} \right]^{4 - }}\)

4 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_4}} \right]^{3 - }};{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_6}} \right]^{4 - }}\)

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321053 Silver containing lead as an impurity is removed
by

1 poling

2 cupellation

3 lavigation

4 distillation

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321054 Select incorrect statement regarding silver extraction process :

1 When the lead-silver alloy is rich in silver, lead is removed by the cupellation process.

2 When the lead-silver alloy is rich in lead, lead is removed by Parke's or Pattinson's process.

3 Zinc forms an alloy with lead, from which lead is separated by distillation.

4 Zinc forms an alloy with silver, from which zinc is separated by distillation.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321055 Gold is extracted by hydrometallurgical process based on its property

1 Of being electropositive

2 Of being less reactive

3 To form salts which are water soluble

4 To form complexes which are water soluble

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321056 The chemical compound formed in the extraction of gold by cyanide process is

1 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]_{(\mathrm{aq})}^{-}}\)

2 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]_{(\mathrm{aq})}^{-3}}\)

3 \(\mathrm{\mathrm{Au}(\mathrm{CN})_{2}}\)

4 \(\mathrm{\mathrm{Au}(\mathrm{OH})}\)

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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321052 Roasted gold ore \( + {\text{C}}{{\text{N}}^ - } + {{\text{H}}_2}{\text{O}}\xrightarrow{{{{\text{O}}_2}}}[{\text{X}}] + {\text{O}}{{\text{H}}^ - }\)
\([{\rm{X}}] + {\rm{Zn}} \to [{\rm{Y}}] + {\rm{Au}}]\) [X] and [Y] are

1 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_2}} \right]^ - };{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_4}} \right]^{2 - }}\)

2 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_4}} \right]^{3 - }};{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_4}} \right]^{2 - }}\)

3 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_2}} \right]^ - };{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_6}} \right]^{4 - }}\)

4 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_4}} \right]^{3 - }};{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_6}} \right]^{4 - }}\)

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321053 Silver containing lead as an impurity is removed
by

1 poling

2 cupellation

3 lavigation

4 distillation

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321054 Select incorrect statement regarding silver extraction process :

1 When the lead-silver alloy is rich in silver, lead is removed by the cupellation process.

2 When the lead-silver alloy is rich in lead, lead is removed by Parke's or Pattinson's process.

3 Zinc forms an alloy with lead, from which lead is separated by distillation.

4 Zinc forms an alloy with silver, from which zinc is separated by distillation.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321055 Gold is extracted by hydrometallurgical process based on its property

1 Of being electropositive

2 Of being less reactive

3 To form salts which are water soluble

4 To form complexes which are water soluble

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321056 The chemical compound formed in the extraction of gold by cyanide process is

1 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]_{(\mathrm{aq})}^{-}}\)

2 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]_{(\mathrm{aq})}^{-3}}\)

3 \(\mathrm{\mathrm{Au}(\mathrm{CN})_{2}}\)

4 \(\mathrm{\mathrm{Au}(\mathrm{OH})}\)

NEET DIGITAL LIBRARY

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321052 Roasted gold ore \( + {\text{C}}{{\text{N}}^ - } + {{\text{H}}_2}{\text{O}}\xrightarrow{{{{\text{O}}_2}}}[{\text{X}}] + {\text{O}}{{\text{H}}^ - }\)
\([{\rm{X}}] + {\rm{Zn}} \to [{\rm{Y}}] + {\rm{Au}}]\) [X] and [Y] are

1 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_2}} \right]^ - };{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_4}} \right]^{2 - }}\)

2 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_4}} \right]^{3 - }};{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_4}} \right]^{2 - }}\)

3 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_2}} \right]^ - };{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_6}} \right]^{4 - }}\)

4 \({\rm{X}} = {\left[ {{\rm{Au}}{{({\rm{CN}})}_4}} \right]^{3 - }};{\rm{Y}} = {\left[ {{\rm{Zn}}{{({\rm{CN}})}_6}} \right]^{4 - }}\)

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321053 Silver containing lead as an impurity is removed
by

1 poling

2 cupellation

3 lavigation

4 distillation

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321054 Select incorrect statement regarding silver extraction process :

1 When the lead-silver alloy is rich in silver, lead is removed by the cupellation process.

2 When the lead-silver alloy is rich in lead, lead is removed by Parke's or Pattinson's process.

3 Zinc forms an alloy with lead, from which lead is separated by distillation.

4 Zinc forms an alloy with silver, from which zinc is separated by distillation.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321055 Gold is extracted by hydrometallurgical process based on its property

1 Of being electropositive

2 Of being less reactive

3 To form salts which are water soluble

4 To form complexes which are water soluble

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321056 The chemical compound formed in the extraction of gold by cyanide process is

1 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{2}\right]_{(\mathrm{aq})}^{-}}\)

2 \(\mathrm{\left[\mathrm{Au}(\mathrm{CN})_{4}\right]_{(\mathrm{aq})}^{-3}}\)

3 \(\mathrm{\mathrm{Au}(\mathrm{CN})_{2}}\)

4 \(\mathrm{\mathrm{Au}(\mathrm{OH})}\)

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