Class XI

Acids are always
  1. Solid crystals
  2. Aqueous
  3. Gases
  4. Liquid
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
Molar mass of Calcium Carbonate CaCO3 is
  1. 100.0869 g/mol
  2. 99.0154g/mol
  3. 110.018g/mol
  4. 101.087g/mol
Consider reaction: CuO + H2SO4 → CuSO4 + H2O. salt is obtained through the
  1. Crystallization
  2. Fractional distillation
  3. Vacuum distillation
  4. Centrifugation
If nucleon number of potassium is 39, number of neutrons will be
  1. 39
  2. 29
  3. 19
  4. 20
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