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

Question
Which compound is used as a chemical sterilant and bleaching agent?
A. Hydrogen peroxide
B. Ethanol
C. Methanol
D. Acetone
Answer: Option A
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.
This question belongs to: Science chemistry
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Question #1
Which of the following is a primary air pollutant?
A. Sulphuric acid
B. PAN (Peroxyacetyl nitrate)
C. Carbon monoxide
D. Ozone
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Correct Answer: Option C

Explanation:
Primary air pollutants are emitted directly from a source. Carbon monoxide (CO), sulfur dioxide (SO₂), and nitrogen oxides (NOx) are primary pollutants. Ozone, PAN, and sulfuric acid are secondary pollutants, formed in the atmosphere by reactions of primary pollutants.
This question belongs to: Science chemistry
Question #2
NPK fertilizers provide which three primary macronutrients to plants?
A. Nitrogen, Phosphorus, Potassium
B. Nitrogen, Potassium, Carbon
C. Nickel, Phosphorus, Potassium
D. Nitrogen, Phosphorus, Calcium
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Correct Answer: Option A

Explanation:
NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K). These are the three primary macronutrients essential for plant growth. N promotes leafy growth, P aids root and flower development, and K improves overall health and disease resistance in crops.
This question belongs to: Science chemistry
Question #3
Ernest Rutherford is famous for his discovery of the:
A. Atomic theory
B. Electron
C. Neutron
D. Proton and Nucleus
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Correct Answer: Option D

Explanation:
Ernest Rutherford discovered the atomic nucleus through his gold foil alpha-scattering experiment in 1911. He later discovered the proton in 1919 by bombarding nitrogen with alpha particles. J.J. Thomson discovered the electron, and Chadwick discovered the neutron.
This question belongs to: Science chemistry
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