Which compound is used as a chemical sterilant and bleaching agent? MCQ with Answer and Explanation

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Which compound is used as a chemical sterilant and bleaching agent?

A. Methanol

B. Hydrogen peroxide

C. Acetone

D. Ethanol

Answer: Option B

Solution (By JKSSB Mock Tests)

Hydrogen peroxide (H₂O₂) is a strong oxidizing agent that kills microorganisms through oxidative damage and bleaches colored substances. It is used as a disinfectant (3% solution), in hair bleaching, and in the paper textile industry. Ethanol is a disinfectant but not a strong bleaching agent. Methanol is toxic, not used for sterilization. Acetone is a solvent.

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Question #1

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The process of converting a solid directly into gas without passing through the liquid state is called:

A. Sublimation

B. Fusion

C. Condensation

D. Evaporation

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Correct Answer: Option A

Explanation:
Sublimation is the transition of a substance directly from the solid to the gas state without becoming an intermediate liquid. Condensation is gas to liquid, evaporation is liquid to gas at any temperature, and fusion is solid to liquid. Common examples include camphor, naphthalene, and dry ice.

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Question #2

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Fossil fuels are formed from:

A. Meteorites

B. Remains of dead plants and animals buried millions of years ago

C. Volcanic eruptions

D. Direct combination of elements

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Correct Answer: Option B

Explanation:
Fossil fuels (coal, petroleum, natural gas) are formed from organic matter deposited in sedimentary layers, subjected to heat and pressure over geological timescales. They are non-renewable because their formation takes millions of years.

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Question #3

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Assertion (A): Sodium chloride conducts electricity in its molten state. Reason (R): In the molten state, the ions are free to move and carry charge.

A. Both A and R are true but R is NOT the correct explanation of A.

B. Both A and R are true and R is the correct explanation of A.

C. A is false but R is true.

D. A is true but R is false.

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Correct Answer: Option B

Explanation:
Sodium chloride is an ionic compound. In the solid state, its Na+ and Cl- ions are held tightly in a crystal lattice and cannot move, so it doesn't conduct. When melted, the lattice breaks down, and the ions become mobile. These free-moving ions carry the electric current, making it a good conductor.

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