Which of the following is a tetrabasic acid?
  • Hypophosphorus acid
  • Metaphosphoric acid
  • Pyrophosphoric acid
  • Orthophosphoric acid
Which of the following is not correctly matched?
  • Acidic oxides-PONO, CLO
  • Basic oxides-NaOm, CaO, MgO
  • Neutral oxides-CO, CO, BeO
  • Amphoteric oxides-ZnO, SnO,AlO
Sulphur molecule is
  • diatomic
  • triatamic
  • tetratomic
  • Octa-atomic
Which of the following oxides is an hydride of nitrous acid ?
  • N
  • NO
  • (i) and (ii)
  • None of the above
0 h : 0 m : 1 s

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