The smallest particle of a compound that retains its chemical properties is a: MCQ with Answer and Explanation

Question
The smallest particle of a compound that retains its chemical properties is a:
A. Molecule
B. Electron
C. Ion
D. Atom
Answer: Option A
Solution (By JKExamLibrary)
A molecule is the smallest particle of a compound (or element) that can exist independently and exhibit the compound's chemical properties. For covalent compounds (water, CO₂), the molecule is the discrete particle. For ionic compounds, the term 'formula unit' is used rather than molecule. Atoms are smallest particles of elements. Ions are charged atoms/molecules.
This question belongs to: Science chemistry
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Question #1
In the froth flotation process, the depressant is used to:
A. Enhance the froth formation of all minerals.
B. Increase the density of the gangue.
C. Dissolve the ore.
D. Prevent one specific mineral from coming to the froth.
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Correct Answer: Option D

Explanation:
Froth flotation separates sulfide ores from gangue based on their wetting properties. Sometimes, an ore contains multiple sulfides. A depressant (like NaCN) is added to selectively prevent one mineral (e.g., FeS2) from attaching to the froth, allowing only the desired mineral (e.g., PbS) to be separated.
This question belongs to: Science chemistry
Question #2
PVC stands for:
A. Polyvinyl carbide
B. Polyvinyl chloride
C. Polyvinyl carbon
D. Polyvinyl chlorate
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Correct Answer: Option B

Explanation:
PVC (polyvinyl chloride) is a polymer of vinyl chloride (CH₂=CHCl). It is used in pipes, electrical insulation, and flooring. It can be rigid (uPVC) or flexible with plasticizers. It is a thermoplastic. Chlorate/carbon/carbide are not correct expansions.
This question belongs to: Science chemistry
Question #3
Which of the following is a micronutrient for plants?
A. Phosphorus
B. Potassium
C. Zinc
D. Nitrogen
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Correct Answer: Option C

Explanation:
Zinc (Zn) is a micronutrient required in small amounts for plant growth, enzyme activation, and chlorophyll synthesis. Nitrogen, phosphorus, potassium are macronutrients (primary). Micronutrients: Fe, Mn, Zn, Cu, B, Mo, Cl. Deficiency of Zn causes stunted growth and chlorosis. Fertilizers often include micronutrients.
This question belongs to: Science chemistry
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