Class XI

 Difficulty of discharge is highest in
  1. calcium ions
  2. Copper ions
  3. lead ions
  4. silver ions
Due to mobile valence electrons,
  1. metals are rigid
  2. metals are not rigid
  3. metals are poor electrolytes
  4. metals are poor insulators
Phosphoric acid has formula
  1. H2PO3
  2. H2PO4
  3. H3PO4
  4. H3PO3
In polarization, positive side attracts the
  1. negative side of water molecules
  2. positive side of water molecules
  3. substance dissolves completely in water
  4. metals of group VII
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