Class IX

Who laid the foundation of laws of Chemical Combination:
  1. Proust
  2. Dalton
  3. Lavoisier
  4. Democritus
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
The number of electrons in the outermost shell in the atom of an inert element is
  1. 0
  2. 1
  3. 2
  4. 8
Law of Definite Proportions was proposed by:
  1. A Lavosier
  2. John Dalton
  3. Joseph Proust
  4. Wilhelm Ostwald
Formula for Magnesium Chloride is:
  1. MgCl
  2. Mg₂Cl
  3. Mg₂Cl
  4. MgCl₄
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