1) What is the chemical formula of ethyne? a) A. C₂H₄ b) B. C₂H₆ c) C. C₂H₂ d) D. CH₄ 2) What is observed as you drop water onto the calcium carbide? a) Fizzing/Bubbling b) Pop sound 3) Which two substances are needed to prepare ethyne in the laboratory? a) A. Ethanol and aluminium oxide b) B. Calcium carbide and water c) C. Copper sulfate and hydrogen d) D. Ethanol and bromine water 4) What is the purpose of the acidified copper sulfate in the experiment? a) A. To catalyse the reaction b) B. To dry the gas c) C. To remove impurities d) D. To make the reaction faster 5) Why is the first test tube of collected gas usually discarded? a) A. It contains calcium carbide b) B. It contains mostly ethene c) C. It contains mostly air d) D. It contains copper sulfate 6) What is observed when ethyne undergoes complete combustion? a) A. A bright blue flame b) B. A colourless flame c) C. A sooty (luminous) flame d) D. A flame with no residue 7) What is the balanced chemical equation for the combustion of ethyne? a) A. C₂H₂ + O₂ → CO₂ + H₂O b) B. C₂H₂ + 2O₂ → 2CO₂ + H₂O c) C. 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O d) D. 2C₂H₂ + 3O₂ → 2CO₂ + 2H₂O 8) Which test confirms the presence of a triple bond in ethyne? a) A. Limewater turns milky b) B. Acidified potassium permanganate remains purple c) C. Bromine water turns from red/brown to colourless d) D. Blue litmus turns red 9) Which test confirms the presence of a triple bond in ethyne? a) A. Limewater turns milky b) B. Acidified potassium permanganate changes from purple to colourless c) C. Bromine water turns stays red/brown d) D. Blue litmus turns red 10) Which of the following is a use of ethyne? a) A. As a refrigerant gas b) B. For disinfecting glassware c) C. For welding and cutting metals d) D. For fertilising soil 11) What type of bond makes ethyne an unsaturated compound? a) A. Single bond b) B. Double bond c) C. Triple bond d) D. Ionic bond 12) What is the formula for calcium carbide? a) C2Ca b) CaC2 13) Write a balanced chemical equation for the preparation of ethyne. a) A. C₂H₅OH → C₂H₂ + H₂O b) B. CaCO₃ + HCl → CaCl₂ + CO₂ + H₂O c) C. CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂ d) D. Ca(OH)₂ + CO₂ → CaCO₃ + H₂O 14) What class of hydrocarbon does ethyne belong to? a) A. Alkane b) B. Alkene c) C. Alkyne 15) What safety concern is associated with handling calcium carbide? a) A. It is highly acidic b) B. It can explode in air c) C. It reacts violently with water, producing flammable gas d) D. It is radioactive 16) Which of the following best describes the physical state and appearance of ethyne? a) A. Colourless gas with sweet smell b) B. Blue liquid with a pungent odour c) C. Colourless solid with no smell d) D. Brown gas with sharp odour 17) What type of reaction is the bromine water test for ethyne an example of? a) A. Combustion b) B. Elimination c) C. Addition d) D. Displacement

Ethyne Preparation

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