Class IX

The percentage of Hydrogen in H₂O molecule is
  1. 5.55
  2. 11.11
  3. 44.45
  4. 88.89
Formula for Aluminium Oxide is:
  1. AlO
  2. AlO₂
  3. Al₃O₂
  4. Al₂O₃
If Z represents the atomic number and A represents mass number, then the number of electrons in an atom can be computed as
  1. Z
  2. Z-A
  3. A-Z
  4. A+Z
Who laid the foundation of laws of Chemical Combination:
  1. Proust
  2. Dalton
  3. Lavoisier
  4. Democritus
Which one of the following will have the maximum charge/mass ratio?
  1. Proton
  2. Neutron
  3. Electron
  4. α-particle
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