MCQ practice · SSC Chemistry Board questions · Chapter 11: Mineral Resources: Fossils
In CaC₂ + 2H₂O → [X] + Ca(OH)₂, compound 'X' is:
Think it through first, then pick an option.
- a C₂H₂
- b C₂H₄
- c CaO
- d CaCO₃
Answer and explanation
Correct answer: a C₂H₂
Water on calcium carbide gives ethyne (C₂H₂) and Ca(OH)₂.
Why the other options are wrong
- b C₂H₄: C₂H₄ is ethene; CaC₂ gives the triple-bonded ethyne, C₂H₂.
- c CaO: The calcium ends up in Ca(OH)₂, not CaO; X is C₂H₂.
- d CaCO₃: No CaCO₃ forms; the two carbons go into ethyne, C₂H₂.
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