Class XI

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
Which of the following is not correctly matched?
  1. Silver - Ag
  2. Calcium - Ca
  3. Gold - Au
  4. Copper – Co
Formula for Magnesium Chloride is:
  1. MgCl
  2. Mg2Cl
  3. MgCl2
  4. MgCl4
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
Formula for Aluminium Oxide is
  1. AlO
  2. AlO2
  3. Al3O2
  4. Al2O3
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