Class XI

Who laid the foundation of laws of Chemical Combination
  1. Democritus
  2. Lavoisier
  3. Dalton
  4. Proust
Law of Definite Proportions was proposed by
  1. Joseph Proust
  2. John Dalton
  3. A Lavosier
  4. Wilhelm Ostwald
Which of the following will have maximum mass?(
  1. 0.1 mole of NH3
  2. 1022 atoms of Carbon
  3. 1022 molecules of CO2
  4. 1 gm of Fe
1 u or 1 amu means
  1. 1/12th mass of C-12 atoms
  2. Mass of C-12 atom
  3. Mass of O-16 atom
  4. Mass of Hydrogen molecule
Which of the following is not correctly matched?
  1. Silver - Ag
  2. Calcium - Ca
  3. Gold - Au
  4. Copper – Co
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