Class XI

 Melting point of silicon is
  1. 410 °C
  2. 110 °C
  3. 140 °C
  4. 1410 °C
 Elements un-common to both living things and non-living things include
  1. Oxygen
  2. Carbon
  3. Silicon
  4. Nitrogen
Number of replaceable hydrogen atoms in phosphoric acid is
  1. 1
  2. 2
  3. 3
  4. 4
Difficulty of discharge is highest in
  1. Hydroxide ions
  2. Bromide ion
  3. Nitrate ion
  4. Chloride ions
 In solid state, ionic compounds
  1. Have low melting points
  2. Have low boiling points
  3. Conduct electricity
  4. Are non-conductors of electricity
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