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प्रश्न
Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth floatation process preferably?
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उत्तर
PbS
संबंधित प्रश्न
What criterion is followed for the selection of the stationary phase in chromatography?
Indicate the principle behind the method used for the refining of Nickel.
In which of the following method of purification, metal is converted to its volatile compound which is decomposed to give pure metal?
(i) Heating with stream of carbon monoxide.
(ii) Heating with iodine.
(iii) Liquation.
(iv) Distillation.
Match the items of Column I with the items of Column II and assign the correct code:
| Column I | Column II |
| (A) Coloured bands | (1) Zone refining |
| (B) Impure metal to volatile complex | (2) Fractional distillation |
| (C) Purification of Ge and Si | (3) Mond Process |
| (D) Purification of mercury | (4) Chromatography |
| (5) Liquation |
Assertion: Zone refining method is very useful for producing semiconductors.
Reason: Semiconductors are of high purity.
Assertion: Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal.
Reason: Copper is extracted by hydrometallurgy.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
