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Unit - 9.1 Occurrence of Carbon And Its Allotropic Forms — CHEMISTRY STD 8 — Question

ICSE BoardEnglish MediumSTD 8CHEMISTRYUnit - 9.1 Occurrence of Carbon And Its Allotropic Forms2 Marks
Question
Name two substances in which element carbon occurs in:
(a) free state
(b) combined solid state
(c) combined liquid state
(d) combined gaseous state
✓

Answer

It occurs as diamond, graphite in impure form as coal, in the free state. It occurs as carbon dioxide in the atmosphere, hydrocarbon as natural ga petroleum, cellulose in wood and limestone in combined states.
(a) In free state C exists as Diamond and Graphite
(b)Combined State (solid) - CaCO3 and CaC2
(c) Combined state (liquid) - CS2 and CCl4
(d) Combined state (gas) - CO2 and CH4

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