Class XI

 Difficulty of discharge is lowest in
  1. Magnesium ions
  2. Zinc ions
  3. Lead ions
  4. Hydrogen ions
 Impurities...
  1. lower boiling point
  2. lower freezing point
  3. lower melting points
  4. raise melting point
Sodium Carbonate Na2CO3 indicates that for each Carbonate ion (CO3-2), number of Sodium ions (Na+) are
  1. 1
  2. 2
  3. 3
  4. 4
Chemical formula of anhydrous Monosodium Phosphate is
  1. NaPO3
  2. NaH2PO4
  3. Na2CO3.10H2O
  4. NaH2PO4.H2O
Sulphate ion can be written symbolically as
  1. SO42-
  2. SO32-
  3. SO42-
  4. S2-
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