Class XI

Pure ice melts at exactly
  1. −100 °C
  2. zero °C
  3. 10 °C
  4. 20°C
 Purpose of Lean Burn engines is to
  1. Produce less air pollution
  2. Consume lesser oxygen
  3. Produce more efficient fuel combustion
  4. Use them in sky rockets
Hydroxonium ions are represented as
  1. OH ions
  2. H2O3 ions
  3. H3O ions
  4. H2O3
 Insoluble salt is
  1. PbCl2
  2. HgCl2
  3. NaCl
  4. Both A and B
Praseodymium is the
  1. Longest name in period table
  2. Most volatile metal
  3. A recently discovered noble gas
  4. An excellent conductor of electricity
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