Class XI

Molar mass of Calcium Carbonate CaCO3 is
  1. 100.0869 g/mol
  2. 99.0154g/mol
  3. 110.018g/mol
  4. 101.087g/mol
If nucleon number of potassium is 39, number of neutrons will be
  1. 39
  2. 29
  3. 19
  4. 20
Incorrect statement is: An exothermic reaction...
  1. Forms a compound which gives out heat while being formed
  2. Contains products that are very stable
  3. Overall enthalpy change is zero
  4. Overall enthalpy is negative
Consider reaction: CuO + H2SO4 → CuSO4 + H2O. salt is obtained through the
  1. Crystallization
  2. Fractional distillation
  3. Vacuum distillation
  4. Centrifugation
Acids are always
  1. Solid crystals
  2. Aqueous
  3. Gases
  4. Liquid
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