Class XI

 Duration of bright-bulb can be enhanced, if along with copper
  1. magnesium is used
  2. acid is more dilute
  3. zinc
  4. graphite
Sulphate ion can be written symbolically as
  1. SO42-
  2. SO32-
  3. SO42-
  4. S2-
Chemical formula of anhydrous Monosodium Phosphate is
  1. NaPO3
  2. NaH2PO4
  3. Na2CO3.10H2O
  4. NaH2PO4.H2O
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
 Impurities...
  1. lower boiling point
  2. lower freezing point
  3. lower melting points
  4. raise melting point
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