Q41.Given below are two statements: Statement I : Sphalerite is a sulphide ore of zinc and copper glance is a sulphide ore of copper. Statement II : It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a froth flotation method. Choose the most appropriate answer from the options given below : (1) Statement I is true but Statement II is false. (2) Both Statement I and Statement II are true. (3) Both Statement I and Statement II are false. (4) Statement I is false but Statement II is true.
What This Question Tests
This question tests factual knowledge about common sulphide ores and the principles behind the froth flotation method, including the use of depressants for selective separation.
Concepts Tested
📚 NCERT Sections This Tests
2.1 — Arrange The Following Metals In The Order In Which They Displace Each Other
Chemistry Class 11 · Chapter 2
2.1 Arrange the following metals in the order in which they displace each other from the solution of their salts. Al, Cu, Fe, Mg and Zn.
5.14 — What Is The Coordination Entity Formed When Excess Of Aqueous Kcn Is
Chemistry Class 11 · Chapter 5
5.14 What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H2S(g) is passed through this solution?
5.13 — Aqueous Copper Sulphate Solution (Blue In Colour) Gives:
Chemistry Class 11 · Chapter 5
5.13 Aqueous copper sulphate solution (blue in colour) gives: (i) a green precipitate with aqueous potassium fluoride and (ii) a bright green solution with aqueous potassium chloride. Explain these experimental results.
📋 Question Details
- Chapter
- Metallurgy
- Topic
- Concentration of ores
- Year
- 2021
- Shift
- 26 Aug Shift 2
- Q Number
- Q41
- Type
- Assertion Reasoning
- NCERT Ref
- Class 12 Chemistry Ch 6: General Principles and Processes of Isolation of Elements
More from this Chapter
Q62.Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly? JEE Main 2008 JEE Main Previous Year Paper (1) Metal sulphides are thermodynamically more (2) CO2 is thermodynamically more stable than CS2 stable than CS2 (3) Metal sulphides are less stable than the (4) CO2 is more volatile than CS2 corresponding oxides
Q41.Which of the oxide groups among the following cannot be reduced by carbon? (1) Cu2O, SnO2 (2) CaO, K2O (3) PbO, Fe2O4 (4) Fe2O3, ZnO
Q52.In the electrolysis of alumina to obtain aluminium metal, cryolite is added mainly to (1) lower the melting point of alumina (2) dissolve alumina in molten cryolite (3) remove the impurities of alumina (4) increase the electrical conductivity
Q52.Extraction of zinc from zinc blende is achieved by (1) roasting followed by self-reduction (2) electrolytic reduction (3) roasting followed by reduction with carbon (4) roasting followed by reduction with another metal