The chemical formula of Teflon is: MCQ with Answer and Explanation

Question
The chemical formula of Teflon is:
A. (CH₂-CHCl)ₙ
B. (CF₂-CF₂)ₙ
C. (CH₂-CH₂)ₙ
D. (CH₂-C₆H₅)ₙ
Answer: Option B
Solution (By JKExamLibrary)
Teflon (PTFE) is polymerized tetrafluoroethene, repeating unit –CF₂–CF₂–. Option A is PVC, C is polythene, D is polystyrene. Teflon is highly inert, used in non-stick cookware.
This question belongs to: Science chemistry

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Question #1
Assertion (A): Ethene decolorizes bromine water. Reason (R): Ethene undergoes an addition reaction with bromine.
A. Both A and R are true but R is NOT the correct explanation of A.
B. A is false but R is true.
C. A is true but R is false.
D. Both A and R are true and R is the correct explanation of A.
Discuss

Correct Answer: Option D

Explanation:
Ethene (C2H4) is an alkene containing a reactive carbon-carbon double bond. When bromine water (brown) is added to ethene, the double bond breaks and bromine atoms add across it to form 1,2-dibromoethane (colorless). This addition reaction decolorizes the bromine water, serving as a test for unsaturation.
This question belongs to: Science chemistry
Question #2
In a redox reaction:
A. Only oxidation occurs.
B. Only reduction occurs.
C. Oxidation and reduction occur simultaneously.
D. Neither oxidation nor reduction occurs.
Discuss

Correct Answer: Option C

Explanation:
Redox stands for reduction-oxidation. In any redox reaction, oxidation (loss of electrons) and reduction (gain of electrons) always occur simultaneously. The substance oxidized acts as a reducing agent, and the substance reduced acts as an oxidizing agent. One cannot happen without the other.
This question belongs to: Science chemistry
Question #3
Plaster of Paris should be stored in a moisture-proof container because:
A. It reacts with moisture to form a hard solid (gypsum)
B. It dissolves in water
C. It evaporates
D. It sublimes
Discuss

Correct Answer: Option A

Explanation:
CaSO₄·½H₂O readily absorbs moisture to set to CaSO₄·2H₂O (gypsum), becoming hard and useless for molding. So it must be kept dry. Reaction: CaSO₄·½H₂O + 1½H₂O → CaSO₄·2H₂O.
This question belongs to: Science chemistry
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