contributor to the gross domestic product of
Tripura ?
Correct Answer
Primary
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Primary
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6 months
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with
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Dry, hot and windy
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W. C. Banerjee
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Soviet Union
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Lysosome
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42
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Decreased by 1%
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Marble
<b>Answer: D. Marble</b> <ul> <li><b>Key concept:</b> An element is a substance made of only one kind of atom. Marble is not an element; it is a rock/mineral mainly of calcium carbonate (CaCO3), a compound.</li> <li><b>A. Oxygen</b> โ element (O)</li> <li><b>B. Nitrogen</b> โ element (N)</li> <li><b>C. Hydrogen</b> โ element (H)</li> <li><b>Why others are incorrect</b>: A, B, C are pure elements; Marble is a chemical compound/mineral, not a single element.</li> </ul> <p><b>Exam tip:</b> Remember: elements are listed on the periodic table; rocks/minerals are compounds. </p>