Identify the correct statement regarding graphite:
A. It is the hardest natural substance.
B. It is a form of coal.
C. It has a layered structure and conducts electricity.
D. It is an electrical insulator.
Answer: Option C
Solution (By JKExamLibrary)
Graphite has a layered structure with weak van der Waals forces between layers and delocalized electrons within layers, making it a good conductor and lubricant. Diamond is the hardest; coal is amorphous carbon.
Explanation:
Gastric juice in the stomach contains hydrochloric acid (HCl) which aids digestion and kills bacteria. Orange juice contains citric acid, vinegar acetic acid, milk lactic acid (from fermentation). The pH of stomach acid is around 1-2.
Explanation:
Terylene is a synthetic fiber belonging to the polyester family. Chemically, it is polyethylene terephthalate (PET), formed by the condensation polymerization of ethylene glycol and terephthalic acid. It is widely used in textiles, plastic bottles, and recording tapes.
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