PVC (polyvinyl chloride) is used for making pipes and insulation because it is: MCQ with Answer and Explanation

Question
PVC (polyvinyl chloride) is used for making pipes and insulation because it is:
A. Biodegradable
B. Highly flexible without additives
C. A good insulator and chemically resistant
D. Conductor of electricity
Answer: Option C
Solution (By JKExamLibrary)
PVC is a good electrical insulator, resistant to chemicals, water, and fire (self-extinguishing due to chlorine content), making it suitable for cable insulation, pipes, and medical tubing. It is not biodegradable. Flexibility is achieved by adding plasticizers, otherwise rigid. It is an addition polymer of vinyl chloride. Unplasticized PVC (uPVC) is used in construction.
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Question #1
Mendeleev's periodic table had anomalies because he arranged elements by:
A. Density
B. Atomic mass
C. Electronegativity
D. Atomic number
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Correct Answer: Option B

Explanation:
Mendeleev used atomic mass as basis. Anomalies like Ar (mass 40) placed before K (mass 39) occurred. These were resolved when Moseley proposed atomic number as the basis.
This question belongs to: Science chemistry
Question #2
Which of the following is a metal?
A. Chlorine
B. Phosphorus
C. Sulfur
D. Sodium
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Correct Answer: Option D

Explanation:
Sodium (Na) is a soft, silvery-white alkali metal (Group 1). It is highly reactive, conducts electricity, and is malleable. Sulfur and phosphorus are non-metals; chlorine is a non-metal halogen gas. Sodium is never found free in nature; it is stored under kerosene to prevent reaction with air/moisture. It reacts vigorously with water, producing NaOH and H₂.
This question belongs to: Science chemistry
Question #3
Which gas is primarily responsible for the greenhouse effect from burning fossil fuels?
A. Nitrogen
B. Hydrogen
C. Oxygen
D. Carbon dioxide
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Correct Answer: Option D

Explanation:
Carbon dioxide (CO₂) is the primary greenhouse gas emitted from the burning of fossil fuels (coal, oil, natural gas). It traps heat in the Earth's atmosphere, leading to global warming. Oxygen, nitrogen, and hydrogen do not absorb infrared radiation and thus do not contribute to the greenhouse effect.
This question belongs to: Science chemistry
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