Class IX

Sodium metal is soft due to
  1. weak metallic bond
  2. strong metallic bond
  3. large size
  4. small size
Tendency of a metal to loose electron is called
  1. electronegativity
  2. electro positivity
  3. electrolysis
  4. electroplating
Metals difficult to oxidize are called
  1. weak metals
  2. strong metals
  3. noble metals
  4. none of above
As size of atom increases down group, electro positivity
  1. increases
  2. decreases
  3. remains same
  4. none of above
Most acidic among following is
  1. HF
  2. HCl
  3. HBr
  4. HI
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