Class XI

Many d-block and f-block elements form
  1. ionic hydride
  2. covalent hydride
  3. saline hydride
  4. metallic hydride
For moderation of the climate and body temperature of living beings, the responsible factor is:
  1. high heat of fusion
  2. high specific heat,
  3. high surface tension
  4. high heat of vaporisation
Hydrogen is the first element in the periodic table and has resemblance to alkali metals as well as with halogens. However, its placement in the periodic table has been a subject of discussion in the past. Currently hydrogen is placed in which group?
  1. separate group
  2. 4
  3. 1
  4. 17
Heavy hydrogen is also called
  1. dihydrogen
  2. deuterium
  3. protium
  4. tritium
Zeolite/permutit process is also called
  1. Clark’s method
  2. Ion-exchange method:
  3. Synthetic resins method
  4. Calgon’s method:
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