Class X

Buckminsterfullerene is an example of _______ of carbon
  1. an isomer
  2. an isotope
  3. an allotrope
  4. a functional group
Vinegar is a solution of
  1. 30% � 40% acetic acid in alcohol
  2. 5% � 8% acetic acid in alcohol
  3. 5% � 8% acetic acid in water
  4. 15% � 20% acetic acid in water
. Which of the following can be used for the denaturation of ethyl alcohol?
  1. Methyl alcohol
  2. Pyridines
  3. Copper sulphate
  4. All of the above
General formula of alkyne is
  1. CnH2n+2
  2. CnH2n
  3. CnH2n-2
  4. CnHn
The gas used in welding and cutting metals is
  1. ethyne
  2. ethene
  3. ethane
  4. propene
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