Class XII

Which one of the following is an example of non – typical transition elements?
  1. Ba, Ga, Sr
  2. Zn, Cd, Hg
  3. Be, Al Pb
  4. Li, Na, K
Red hot steel rods on suddenly immersing in water become
  1. Soft and malleable
  2. Hard and brittle
  3. Fibrous
  4. Tough and ductile
The f – block elements are known as --------------------------------------------------------------------------------
  1. Transition elements
  2. Inert elements
  3. Inner transition elements
  4. Representative elements
Mohr’s salt is a better volumetric agent then ferrous sulphate because
  1. Its reaction are less violent
  2. All the chemical reactions given by ferrous sulphate are given by Mohr’s salt
  3. It does not effloresce like ferrous sulphate
  4. It is less readily oxidised in the solid state
Silver is refined by cupellation process. The process removes the impurity of --------------------------------------------------------------------------------
  1. Au
  2. Cu
  3. Pb
  4. Pt
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