Class XI

 Phosphorus can have a valency of
  1. 2 or 4
  2. 4 or 6
  3. 3 or 5
  4. 2 or 1
 In electrolysis of concentrated HCl, Cl2 is given off at cathode due to
  1. Difficulty of discharging hydroxide ions
  2. Difficulty of discharging chloride ions
  3. Due to high concentration of Chloride ions
  4. Ease of discharging chloride ions compared to hydroxide ions
Relative molecular masses can be calculated
  1. By relative atomic mass
  2. B y relative mass of a covalent compound
  3. If individual relative atomic masses are added
  4. By adding relative compound masses
 In Liebig condenser,
  1. Coldest part of condenser is at top
  2. water enters in jacket from top
  3. Coldest part of condenser is at bottom
  4. Water enters in jacket from middle tubules
A compound results from chemical combination of
  1. Two or more atoms
  2. Two or more non-metals
  3. Two or more metalloids
  4. Both A and B
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