25 Questions
What is the composition of Bauxite?
Al2O3.nH2O
Roasting of sulphide ore gives which gas?
SO2
Which reaction represents calcinations?
MgCO3 → MgO + CO2
Which metal oxide cannot be reduced to metal by carbon?
ZnO
Which metal is extracted by the Hall-Heroult process?
Al
Which statement about the advantage of roasting of sulphide ore before reduction is not true?
It makes the ore magnetic.
Which of the following statements is true about the extraction of gold and silver?
Leaching with cyanide ion is used for extraction
Which substance is added in the extraction of aluminium from alumina by electrolysis?
Cryolite to lower the melting point of alumina
What is the purpose of flux in metallurgy?
All of these
Which of the following ores is best concentrated by froth–floatation method?
Galena
What can be concluded from the Ellingham diagram regarding the reduction of alumina?
Mg can be used to reduce alumina
Which process is used for concentrating ore in metallurgy?
Froth floatation
What is the method known as 523K Zr (impure) +2I2 → ZrI4?
Van Arkel process
Which one of the following is not feasible?
$Cu(s) + Zn^{2+}(aq) → Zn(s) + Cu^{2+}(aq)$
What does $ riangle G^{ heta}_f$ indicate about sulphide, CS2, and H2S?
$ riangle G^{ heta}_f$ of sulphide is greater than those for CS2 and H2S.
Which of the following statements about roasting of sulphide to its oxide is not true?
Roasting of the sulphide to its oxide is thermodynamically feasible
Wolframite ore is separated from tinstone by the process of:
Electromagnetic separation
Which one of the following reactions is not feasible?
Cu(s) + Zn2+(aq) → Zn(s) + Cu2+(aq)
Which process is used to extract silver?
Electrochemical process
What is the purpose of flux in metallurgy?
Conversion of infusible impurities to soluble impurities
Which one of the following ores is best concentrated by froth–floatation method?
Galena
In the extraction of aluminium from alumina by electrolysis, cryolite is added to:
Lower the melting point of alumina
How is zinc obtained from ZnO?
Carbon reduction
In the extraction of gold and silver, how is silver later recovered after leaching with cyanide ion?
Displacement with zinc
According to Ellingham diagram, which metal can be used to reduce alumina?
Zn
Study Notes
Composition of Minerals and Ores
- Bauxite is composed of aluminium hydroxide (Al2O3.2H2O)
Roasting of Sulphide Ore
- Roasting of sulphide ore gives sulphur dioxide (SO2) gas
Calcination
- Calcination reaction is represented as CaCO3 → CaO + CO2
Reduction of Metal Oxides
- Chromium oxide (Cr2O3) cannot be reduced to metal by carbon
Extraction of Metals
- Aluminium is extracted by the Hall-Heroult process
- Gold and silver are extracted by leaching with cyanide ion, and silver is later recovered by reacting with zinc
Roasting of Sulphide Ore
- Roasting of sulphide ore does not make the ore porous
Extraction of Aluminium
- Cryolite is added to alumina in the extraction of aluminium by electrolysis to lower the melting point
Metallurgy
- Flux is added in metallurgy to remove impurities
- Froth-floatation method is used to concentrate ores like sulphide ores
- Magnetic separation is used to concentrate wolframite ore from tinstone
Reduction of Alumina
- According to the Ellingham diagram, aluminium can be used to reduce alumina
- Zinc can be obtained from ZnO by reducing it with carbon at high temperatures
Miscellaneous
- The Van Arkel process is used to purify Zr, represented as 523K Zr (impure) + 2I2 → ZrI4
- The reaction 2Al + Fe2O3 → 2Fe + Al2O3 is not feasible
- ΔG^θ_f indicates the feasibility of a reaction, and a negative value indicates a spontaneous reaction, making it feasible to obtain sulphide, CS2, and H2S
This quiz is a collection of one mark question bank and lesson wise slip test question papers for Chemistry. It covers book back questions and additional questions from Volume 1 & 2 of the specified publication.
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