Class XI

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