Class XI

 Melting point of diamond is
  1. 340 °C
  2. 3400 °C
  3. 370 °C
  4. 3700 °C
Symbol of Boron is
  1. B
  2. Ba
  3. Br
  4. Be
Diamonds...
  1. cannot conduct electricity
  2. can conduct electricity
  3. have metallic bonds
  4. is an oxide
If proton number is 19, electron configuration will be
  1. 2,8,7
  2. 2,8,18
  3. 2,8,8,1
  4. 2,8,8,3
Presence of impurities cause
  1. a rise in boiling point
  2. a fall in melting point
  3. a fall in condensation point
  4. Both A and B
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