Class XI

Who laid the foundation of laws of Chemical Combination
  1. Democritus
  2. Lavoisier
  3. Dalton
  4. Proust
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
The number of moles for 52g of He is:(Atomic Mass of He: 4u)
  1. 6.022 × 1023
  2. 13
  3. 52
  4. 1
Formula for Aluminium Oxide is
  1. AlO
  2. AlO2
  3. Al3O2
  4. Al2O3
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
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