Class IX

Most acidic among following is
  1. HF
  2. HCl
  3. HBr
  4. HI
As size of atom increases down group, electro positivity
  1. increases
  2. decreases
  3. remains same
  4. none of above
Elements which have properties of metals and non-metals are
  1. amorphous
  2. crystalline
  3. metalloids
  4. none of above
As we move across period basic character of oxides
  1. increases
  2. remains same
  3. decreases
  4. becomes zero
On contact with oxygen, Rubidium forms
  1. normal oxide
  2. per oxide
  3. super oxide
  4. none of above
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