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
 Consider equation ZnO + NaOH + H2O → Na2Zn(OH)4. Moles of product required to balance equation would be
  1. 1
  2. 2
  3. 3
  4. 4
 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
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