CBSE  /  Class 10  /  Science  /  Carbon and Its Compounds

  • 1. 
    Carbon exists in the atmosphere in the form of

  • carbon monoxide only
  • carbon monoxide in traces and carbon dioxide
  • carbon dioxide only
  • coal

  • 2. 
    Graphite is used as a lubricant in machines because

  • it is a good conductor of electricity.
  • it has a high melting point and slippery layers.
  • its density ranges from 1. 9 to 2. 3 g/cm
  • it is strong and soft.

  • 3. 
    The allotrope of carbon which is a good conductor of heat and electricity is

  • diamond
  • graphite
  • charcoal
  • none of these

  • 4. 
    Which of the following does not belong to the same homologous series?

  • CH
  • C
  • C
  • C

  • 5. 
    Which of the following is not considered as crystalline allotrope of carbon?

  • Coal
  • Diamond
  • Graphite
  • Fullerence

  • 6. 
    Which form of carbon is found in Golkonda mines of Karnataka?

  • Diamond
  • Graphite
  • Coal
  • Coke

  • 7. 
    Lead pencil contains

  • graphite
  • diamond
  • lead
  • lead sulphate

  • 8. 
    Mineral acids are stronger acids than carboxylic acids because

  • (i) and (iv)
  • (ii) and (iii)
  • (i) and (ii)
  • (iii) and (iv)

  • 9. 
    When ethyl alcohol and acetic acid are mixed, the resulting ester has a chemical formula

  • CHCOOCH
  • CHCOOCH
  • CHCOOCH

  • 10. 
    A few drops of ethanoic acid were added to solid sodium carbonate. The observation made was that

  • a hissing sound was produced
  • brown fumes evolved
  • brisk effervescence occurred
  • a pungent smelling gas evolved
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