Metallic carbide on treatment with water gives a colorless gas which burns readily in air and gives a white precipitate with AgNO3 + NaOH the gas is
Correct answer: B. C2H2
- A. CH4
- B. C2H2
- C. C2H4
- D. C2H6
Explanation
Metallic carbide/Calcium Carbide: CaC2 Calcium carbide on hydration gives acetylene. Which on reaction with sodium hydroxide and silver nitrate produces white ppt. Solution: Reacting metallic carbide with water: CaC2 + 2H2O ---> Ca(OH)2 + C2H2 The gas C2H2 is acetylene Reacting acetylene with air/O2 C2H2 + 5/2O2 --> 2CO2 + H2O CH≡ CH + 2[Ag(NH3)2]NO3 -> Ag−C≡ C−Ag + 2NH3 +2 NH4NO3
This question appeared on the ETEA MDCAT 2008 paper, which you can sit online with every answer explained.
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About Alkynes
Alkynes are unsaturated hydrocarbons containing a carbon-carbon triple bond, with sp-hybridised carbon atoms and a linear arrangement around the bond. The content includes nomenclature, preparation, acidity of terminal alkynes, and addition reactions with hydrogen, halogens, hydrogen halides and water, as well as oxidation.
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