Class IX

Most acidic among following is
  1. HF
  2. HCl
  3. HBr
  4. HI
Elements which have properties of metals and non-metals are
  1. amorphous
  2. crystalline
  3. metalloids
  4. none of above
Tendency of a metal to loose electron is called
  1. electronegativity
  2. electro positivity
  3. electrolysis
  4. electroplating
The ozone layer restricts
  1. visible light
  2. infrared radiation
  3. x-rays and gamma rays
  4. ultraviolet radiation
On contact with oxygen, Rubidium forms
  1. normal oxide
  2. per oxide
  3. super oxide
  4. none of above
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