Class XI

Formula for Aluminium Oxide is
  1. AlO
  2. AlO2
  3. Al3O2
  4. Al2O3
The percentage of Hydrogen in H2O molecule is
  1. 5.55
  2. 11.11
  3. 44.45
  4. ) 88.89
Law of Definite Proportions was proposed by
  1. Joseph Proust
  2. John Dalton
  3. A Lavosier
  4. Wilhelm Ostwald
Which of the following is not correctly matched?
  1. Silver - Ag
  2. Calcium - Ca
  3. Gold - Au
  4. Copper – Co
Who laid the foundation of laws of Chemical Combination
  1. Democritus
  2. Lavoisier
  3. Dalton
  4. Proust
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