CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321210
The term "fools gold" is used for a mineral which shines like gold. The name of mineral is
1 Iron pyrites
2 Copper pyrites
3 Cinnabar
4 Cadmium sulphide
Explanation:
Copper pyrites or Chalco pyrite (\(\rm{{\rm{CuFe}}{{\rm{S}}_{\rm{2}}}}\)) is known as fools gold
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321211
Ferric chloride is used for etching copper and silver metals. This is due to
1 Oxidising action of \(\mathrm{\mathrm{Fe}^{3+}}\) ions
2 Reducing action of \(\mathrm{\mathrm{Fe}^{3+}}\) ions
3 Both oxidising and reducing actions of \(\mathrm{\mathrm{Fe}^{3+}}\) ions
4 Reducing action of \(\mathrm{\mathrm{Fe}^{2+}}\) ions
Explanation:
Cu and Ag metals are etched by \(\rm{{\rm{FeC}}{{\rm{l}}_{\rm{3}}}}\) solution due to the oxidising nature of \(\rm{{\rm{F}}{{\rm{e}}^{{\rm{3 + }}}}}\) \(\rm{{\rm{Cu + 2F}}{{\rm{e}}^{{\rm{3 + }}}} \to {\rm{2F}}{{\rm{e}}^{{\rm{2 + }}}}{\rm{ + C}}{{\rm{u}}^{{\rm{2 + }}}}}\)
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321210
The term "fools gold" is used for a mineral which shines like gold. The name of mineral is
1 Iron pyrites
2 Copper pyrites
3 Cinnabar
4 Cadmium sulphide
Explanation:
Copper pyrites or Chalco pyrite (\(\rm{{\rm{CuFe}}{{\rm{S}}_{\rm{2}}}}\)) is known as fools gold
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321211
Ferric chloride is used for etching copper and silver metals. This is due to
1 Oxidising action of \(\mathrm{\mathrm{Fe}^{3+}}\) ions
2 Reducing action of \(\mathrm{\mathrm{Fe}^{3+}}\) ions
3 Both oxidising and reducing actions of \(\mathrm{\mathrm{Fe}^{3+}}\) ions
4 Reducing action of \(\mathrm{\mathrm{Fe}^{2+}}\) ions
Explanation:
Cu and Ag metals are etched by \(\rm{{\rm{FeC}}{{\rm{l}}_{\rm{3}}}}\) solution due to the oxidising nature of \(\rm{{\rm{F}}{{\rm{e}}^{{\rm{3 + }}}}}\) \(\rm{{\rm{Cu + 2F}}{{\rm{e}}^{{\rm{3 + }}}} \to {\rm{2F}}{{\rm{e}}^{{\rm{2 + }}}}{\rm{ + C}}{{\rm{u}}^{{\rm{2 + }}}}}\)