Carbon exists in the atmosphere in the form of
  • carbon monoxide only
  • carbon monoxide in traces and carbon dioxide
  • carbon dioxide only
  • coal
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.
The allotrope of carbon which is a good conductor of heat and electricity is
  • diamond
  • graphite
  • charcoal
  • none of these
Which of the following is not considered as crystalline allotrope of carbon?
  • Coal
  • Diamond
  • Graphite
  • Fullerence
Which form of carbon is found in Golkonda mines of Karnataka?
  • Diamond
  • Graphite
  • Coal
  • Coke
Lead pencil contains
  • graphite
  • diamond
  • lead
  • lead sulphate
Mineral acids are stronger acids than carboxylic acids because
  • (i) and (iv)
  • (ii) and (iii)
  • (i) and (ii)
  • (iii) and (iv)
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
A reagent which can help us to distinguish between alkenes and alkynes is:
  • Bromine water
  • Carbon tetrachloride
  • Alkaline KMnO
  • Ammoniacal cuprous chloride
The correct structural formula of butanoic acid is
MCQ Questions for Class 10 Science Chapter 4 Carbon and Its Compounds with Answers 1
  • a
  • b
  • c
  • d
The soap molecule has a
  • hydrophilic head and a hydrophobic tail
  • hydrophobic head and a hydrophilic tail
  • hydrophobic head and a hydrophobic tail
  • hydrophilic head and a hydrophilic tail
Detergents can be used for washing of clothes
  • only in hard water
  • only in soft water
  • both in soft and hard water
  • None of the above
Which among the following are unsaturated hydrocarbons?
MCQ Questions for Class 10 Science Chapter 4 Carbon and Its Compounds with Answers 2
  • (i) and (iii)
  • (ii) and (iii)
  • (ii) and (iv)
  • (iii) and (iv)
Acetic acid was added to a solid X kept in a test tube. A colourless, odourless gas Y was evolved. The gas was passed through lime water, which turned milky. It was concluded that
  • solid X is sodium hydroxide and the gas Y is CO2
  • solid X is sodium bicarbonate and the gas Y is CO2
  • solid X is sodium acetate and the gas Y is CO2
  • solid X is sodium bicarbonate and the gas Y is SO2.
Pentane has the molecular formula C5H12. It has
  • 5 covalent bonds
  • 12 covalent bonds
  • 16 covalent bonds
  • 17 covalent bonds
Structural formula of ethyne is
MCQ Questions for Class 10 Science Chapter 4 Carbon and Its Compounds with Answers 3
  • a
  • b
  • c
  • d
A student while observing the properties of acetic acid would report that this smells like
  • vinegar and turns red litmus blue
  • rotten egg and turns red litmus blue
  • vinegar and turns blue litmus red
  • rotten egg and turns blue litmus red
Vinegar is a solution of
  • 50% – 60% acetic acid in alcohol
  • 5% – 8% acetic acid in alcohol
  • 5% – 8% acetic acid in water
  • 50% – 60% acetic acid in water
The portion left on dropping a hydrogen atom from an alkane is called
  • functional group
  • alkenyl group
  • alkyl group
  • phenyl group
The functional group present in a carboxylic acid is
MCQ Questions for Class 10 Science Chapter 4 Carbon and Its Compounds with Answers 5
  • a
  • b
  • c
  • d
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