BPSC CCE Prelims
Chemistry Previous Year Questions (PYQs)
Showing solved Previous Year Questions for Chapter: Chemistry
Topic Breakdown: Scroll →
Which of the following statements about graphite and diamond is true?
Detailed Explanation:
Graphite and diamond are allotropes of carbon—different physical forms of the same element. Both consist of pure carbon atoms and thus undergo identical chemical reactions (e.g., combustion in oxygen to form CO₂).
They differ drastically in crystal structure (graphite: hexagonal layers; diamond: tetrahedral lattice), hardness (graphite: soft; diamond: hardest natural material), and electrical conductivity (graphite: conducts; diamond: insulator)—eliminating Options 1, 2, and 3.
Therefore, only their chemical reactivity is identical, making Option 4 the correct answer.
Which of the following is the major constituent of the liquefied petroleum gas?
Detailed Explanation:
Liquefied Petroleum Gas (LPG) is primarily composed of propane (C₃H₈) and butane (C₄H₁₀), with butane being the major constituent in most commercial LPG blends used for cooking and heating.
Methane is the main component of natural gas (CNG), not LPG, while ethane is present only in trace amounts in petroleum gases.
Therefore, butane is the major constituent of LPG, making Option 4 the correct answer.
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