Class XI

Melting point of silica (SiO2) is
  1. 1650 °C
  2. 1660 °C
  3. 1700 °C
  4. 1760 °C
Turpentine is an example of
  1. Strong electrolyte
  2. Non-electrolyte
  3. Weak electrolyte
  4. Salt
 Valency of magnesium is
  1. 1
  2. 2
  3. -1
  4. -2
Molecular weight of propane (C3H8) is
  1. 44.095g/mol
  2. 40.01g/mol
  3. 41.01g/mol
  4. 46.02g/mol
 A constant temperature at which a pure solid changes into a pure liquid is called
  1. latent heat of vaporization
  2. an elevation in boiling point
  3. melting point
  4. boiling point
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