Class XII

Ferrous sulphate on heating gives
  1. SO2 and O2
  2. SO3
  3. SO2 and SO3
  4. SO2
Which one of the following compound is deliquescent?
  1. HgCl2
  2. Hg2Cl2
  3. ZnCl2
  4. CdCl2
How many d – block elements have ability to evolve hydrogen gas from 2% nitric acid?
  1. 1
  2. 3
  3. Many
  4. 2
Annealing process involves
  1. Heating the steel bright red and then cooling suddenly
  2. Heating the rods of iron in ammonia
  3. Heating the steel bright red and then cooling slowly
  4. Heating the rods of iron embedded in charcoal
Which among the following is not considered as a part of transition elements?
  1. Zinc
  2. Zirconium
  3. Silver
  4. Cadmium
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