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Carbon (Class IX)

Carbon

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Questions

Question 1 Multiple Choice (Single Answer)

Buckminsterfullerene is an allotropic form of

  1. phosphorus
  2. sulphur
  3. carbon
  4. tin
Question 2 Multiple Choice (Single Answer)

Graphite is an allotrope of carbon. Which of the following is not a property of graphite?

  1. It is lighter than diamond.
  2. It does not conduct electricity.
  3. It has a very high melting point.
  4. It burns to form carbon dioxide.
  5. Graphite is a greyish-black opaque substance.
Question 3 Multiple Choice (Single Answer)

Why does carbon form a large number of compounds?

a. Because of its property of catenation
b. Because of its tetravalency
c. Because it exhibits isomerism

  1. Only a
  2. Only b
  3. Only c
  4. All of the above
Question 4 Multiple Choice (Single Answer)

Which of the following statements is/are true for carbon?

(a) Carbon can form only four single covalent bonds.
(b) It can form single, double and triple bonds.
(c) To complete its octet, carbon has to form three bonds.
(d) To complete its octet, carbon has to form four bonds.

  1. Only (a) and (c)
  2. Only (b) and (d)
  3. Only (b)
  4. Only (d)
Question 5 Multiple Choice (Single Answer)

In which of the following forms does carbon occur in free state?

  1. Carbonates
  2. Fossil fuels
  3. Carbon dioxide gas
  4. Graphite
  5. Organic compounds
Question 6 Multiple Choice (Single Answer)

Which of the following statements is not applicable to carbon compounds?

  1. They have low melting and boiling points.
  2. They are ionic in nature.
  3. They form homologous series.
  4. They are generally soluble in organic solvents.
Question 7 Multiple Choice (Single Answer)

Most of the common fuels are either free carbon or carbon compounds. Which of the following common fuels contain free carbon?

a. Petrol
b. Coal
c. Kerosene
d. Charcoal

  1. Only a and b
  2. Only b and c
  3. Only a and c
  4. Only b and d
  5. Only a and d
Question 8 Multiple Choice (Single Answer)

Incomplete combustion of fuels, such as petrol and diesel, gives

  1. nitrogen oxide
  2. sulphur dioxide
  3. carbon monoxide
  4. carbon dioxide
Question 9 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. The amount of carbon present in the earth's crust in the form of minerals is only 0.02%.
b. Carbon atoms can achieve the inert gas electron arrangement only by the sharing of electrons.
c. Carbon and its compounds burn in air to give carbon dioxide gas that turns lime water black.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only c
  5. Only b and c
Question 10 Multiple Choice (Single Answer)

Which of the following is/are the major cause of air pollution in big cities?

  1. Fossil fuels
  2. Acid rain
  3. Heat of dispersion
  4. Sewage waste
  5. None of these
Question 11 Multiple Choice (Single Answer)

Global warming can be controlled by

  1. increasing deforestation and slowing down the growth of human population
  2. increasing deforestation and reducing efficiency of energy usage
  3. reducing deforestation and cutting down the use of fossil fuels
  4. reducing reforestation and increasing the use of fossil fuels
Question 12 Multiple Choice (Single Answer)

Which of the following options correctly describes greenhouse effect?

  1. The retention of heat energy by greenhouse gases
  2. When rainwater becomes acidic due to the presence of sulphur and nitogen
  3. Planting of trees in order to reduce air pollution
  4. The release of oxygen during photosynthesis
  5. None of these
Question 13 Multiple Choice (Single Answer)

The atmospheric pollutant that can cause an increase in the atmospheric temperature is

  1. H2S
  2. NO
  3. CO2
  4. SO2
Question 14 Multiple Choice (Single Answer)

Diamond is harder than graphite, though both of them are allotropes of carbon. This is due to the

  1. hexagonal structure of diamond
  2. difference in their electronic configuration
  3. difference in the size of their crystals
  4. difference in the strength of their respective intermolecular forces
Question 15 Multiple Choice (Single Answer)

How does photosynthesis reduce global warming?

  1. Photosynthesis gives out O2.
  2. Photosynthetic plants absorb toxins from air.
  3. It decreases the concentration of CO2.
  4. Photosynthetic plants bring rain.
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