Class IX

Helium is chemically
  1. active
  2. inert
  3. unstable
  4. none of above
Tendency of atoms to acquire eight electrons in their valence shell is
  1. octet rule
  2. duplet rule
  3. triplet rule
  4. none of above
Electron pairs which are not shared by atoms are called
  1. electron pairs
  2. lone pairs
  3. proton pairs
  4. shell pairs
Synthetic resins are used on places where
  1. air resistance is required
  2. water resistance is required
  3. friction is required
  4. adhesion is required
Chemical bonding between atoms is
  1. electrical in nature
  2. mechanical in nature
  3. both A and B
  4. potential in nature
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