Class IX

The main chemical constituent of clay is
  1. silicon oxide
  2. aluminium borosilicate
  3. zeolites
  4. aluminium silicate
The gas used in the manufacture of vanaspati from vegetable oil is
  1. hydrogen
  2. oxygen
  3. nitrogen
  4. carbon dioxide
The metal does not give H2 on treatment with dilute HCL is
  1. Zn
  2. Fe
  3. Ag
  4. Ca
Zone refining is used for the purification of
  1. Au
  2. Ge
  3. Ag
  4. Cu
The high reactivity of fluorine is due to
  1. its high electro negativity
  2. small size of fluorine atom
  3. availability of d-orbitals
  4. strong F - F bond
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