Class XI

Chemical formula of sodium dihydrogen phosphate is
  1. NaH2PO3
  2. NaH2PO4
  3. Na2H2PO4
  4. Na3H2PO4
Pure water (H2O) is an example of
  1. strong electrolyte
  2. non-electrolyte
  3. weak electrolyte
  4. poor insulator
Salts are formed when
  1. Acids neutralize bases
  2. Acids neutralize alkalis
  3. Acids react with a metal
  4. All of these
 While calculating empirical formula, simplest ratio is obtained by dividing
  1. By smallest number
  2. By largest number
  3. By relative atomic mass
  4. By relative mass of a covalent compound
Suspensions can be successfully separated through
  1. simple or fractional distillation
  2. decanting and centrifugation
  3. boiling points
  4. chromatographs
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