The weight loss of charcoal upon heating is its _____
A. Moisture content
B. Water of hydration
C. Absorption capacity
D. Water content
Answer: A
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A very important property of fuel is ..?
A. Source of the fuel
B. Its density
C. Its octane number
D. Its heat of combustion
Answer: D
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Which of the statements best define charcoal?
A. Charcoal is a fossil fuel
B. Charcoal is a purifying agent
C. An amorphous carbon form from the incomplete combustion of animal or vegetable matter
D. Charcoal is an energy source for cooking
Answer: C
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Mention one precaution to be taking when using activated charcoal.
A. The solution must be cold before adding the charcoal
B. The solution must be allowed to boil with the charcoal
C. The charcoal must be finely powdered
D. Only a small quantity of the charcoal should be used
Answer: A
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During recrystallization, the blockage of the filter funnel can be avoided by
A. A further adding a small quantity of solvent
B. Filtering only hot solution
C. Dissolving the crude solid into the solvent in the normal way
D. None of the above
Answer: A
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The reagent used to precipitate aluminium from aluminate is ?
A. Potassium hydroxide
B. Ammonia hydroxide
C. Sulphuric acid
D. Potassium hydroxide
Answer: C
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The clear colourless solution observed when impurities are removed from aluminium beverage can include?
A. Aluminium hydroxide and water
B. Potassium hydroxide and aluminium hydroxide
C. Potassium hydroxide
D. Potassium hydroxide and water
Answer: B
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What are major residual impurities that are removed from the aluminium beverage can?
A. Paint and hydrogen gas
B. Plastics and paint
C. Plastics and hydrogen gas
D. Plastics and aluminium ions
Answer: D
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To remove the thin plastic coating on the walls of the aluminium, the metal is dissolved in which solution?
A. Potassium hydroxide solution
B. Sulphuric acid solution
C. Aluminium hydroxide solution
D. Hot water
Answer: A
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Why are aluminium beverage cans not reactive with the beverage contents?
A. Because the beverages are inert to aluminium
B. Because the cans have thin plastic coating on the inside
C. Because the beverages are inert to aluminium
D. None of the above options
Answer: B
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