Class XI

Polarization refers to the
  1. Prevention of electricity flowing in electrolyte solution
  2. Rapid dissolving of magnesium in dilute acid
  3. Slow dissolving of magnesium in conc. Acid
  4. Electricity flowing in electrolyte solution
Only covalent molecule conducting electricity is
  1. Helium
  2. Selenium
  3. Mercury
  4. Graphite
In ionic crystals, heat energy is taken in to
  1. Form carbonates
  2. Form sulphates
  3. Break crystal lattices
  4. To form covalent bonds
Acid salts are formed by
  1. Phosphoric acid
  2. Carbonic acid
  3. Sulphuric acid
  4. All of these
Ionic compounds are
  1. Soluble in water
  2. Good conductors of electricity if in molten state
  3. Bad conductors of electricity
  4. Both A and B
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