The separation of two liquids with a boiling point difference of less than 25 K is best achieved by: MCQ with Answer and Explanation

Question
The separation of two liquids with a boiling point difference of less than 25 K is best achieved by:
A. Steam distillation
B. Vacuum distillation
C. Simple distillation
D. Fractional distillation
Answer: Option D
Solution (By JKExamLibrary)
Fractional distillation is specifically designed to separate miscible liquids whose boiling points differ by less than 25 K. It uses a fractionating column which provides surfaces for repeated evaporation and condensation, enriching the vapor with the more volatile component before it reaches the condenser.
This question belongs to: Science chemistry
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Question #1
Hydrogen peroxide is used as a bleaching agent because it:
A. Is a strong oxidizing agent
B. Dehydrates the cloth
C. Absorbs light
D. Is a strong acid
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Correct Answer: Option A

Explanation:
H₂O₂ acts as an oxidizing agent, breaking down colored organic compounds into colorless products. It bleaches hair, textiles, and paper. It also acts as a disinfectant. It decomposes to water and oxygen, leaving no harmful residue, making it environmentally friendly.
This question belongs to: Science chemistry
Question #2
Assertion (A): Aluminum is highly reactive but is used for making cooking utensils. Reason (R): Aluminum forms a protective layer of aluminum oxide on its surface.
A. A is false but R is true.
B. Both A and R are true and R is the correct explanation of A.
C. A is true but R is false.
D. Both A and R are true but R is NOT the correct explanation of A.
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Correct Answer: Option B

Explanation:
Aluminum is a highly reactive metal, yet it is widely used for cookware. This is because it rapidly reacts with atmospheric oxygen to form a thin, tough, and invisible layer of aluminum oxide (Al2O3) on its surface. This passivation layer prevents further corrosion and reaction with food.
This question belongs to: Science chemistry
Question #3
The setting of plaster of Paris involves:
A. Hydration to form gypsum
B. Dehydration
C. Oxidation
D. Carbonation
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Correct Answer: Option A

Explanation:
Plaster of Paris (CaSO₄·½H₂O) sets by rehydrating to gypsum (CaSO₄·2H₂O) when mixed with water: CaSO₄·½H₂O + 1½H₂O → CaSO₄·2H₂O. The interlocking crystals of gypsum provide hardness. It expands slightly on setting, making it ideal for casting. Dehydration is the opposite. Oxidation and carbonation are not involved.
This question belongs to: Science chemistry
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