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What is the hardest form of carbon ?

  • coke
  • graphite
  • charcoal
  • diamond

Answer: Option D

Similar Questions :

1. The major component used in preparation of different types of glasses is :

  • Sodium borate
  • Sodium silicate
  • Silica
  • Calcium silicate

Answer: Option C

2. The single acid which dissolves gold is ?

  • Aqua regia
  • Hydrochloric acid
  • Nitric acid
  • Selenic acid

Answer: Option A

3. Air is a

  • compound
  • colloid
  • element
  • mixture

Answer: Option D

4. Atomic number of an element gives

  • the number of nucleons in its atom
  • the number of electrons in its atom
  • the weight of the atom of the element
  • the total number of elementary particles in its atom

Answer: Option B

5. What is extracted from Bauxite ?

  • Mica
  • Aluminium
  • Copper
  • Tin

Answer: Option B

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