Question : Copper is refined by
Option 1: Roasting
Option 2: Oxidation
Option 3: Electrolysis
Option 4: Zone refining
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Correct Answer: Roasting
Solution : The correct answer is Roasting.
Roasting is a significant stage in the extraction of copper from its ores in the copper refining process. Roasting is the process of heating copper ore, which includes sulphur compounds and various impurities, in the presence of air or oxygen. Sulphur compounds, which can pose issues during the later smelting process, are present in many copper ores and should be eliminated.
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Question : The working of a dry cell is based on
Option 1: Decomposition reaction
Option 2: Spontaneous oxidation-reduction reaction
Option 3: Combination reaction
Option 4: Electrolysis
Question : The hottest part of the gas flame is known as
Option 1: blue zone
Option 2: non-luminous zone
Option 3: luminous zone
Option 4: dark zone
Question : Which of the following is arranged in order of decreasing conductivity?
Option 1: Copper, aluminium, steel, silver
Option 2: Aluminium, silver, copper, steel
Option 3: Copper, silver, aluminium, steel
Option 4: Silver, copper, aluminium, steel
Question : The rate of deforestation is high in
Option 1: Tropical zone
Option 2: Desert areas
Option 3: Temperate zone
Option 4: Boreal forest
Question : Biogas is formed through:
Option 1: fermentation
Option 2: oxidation
Option 3: aerobic respiration
Option 4: reduction
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