Class XI

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
In Oxygen molecule (O2), stability is gained through sharing of
  1. one electron
  2. wo electrons
  3. three electrons
  4. four electrons
Symbol of Boron is
  1. B
  2. Ba
  3. Br
  4. Be
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
Diamonds...
  1. cannot conduct electricity
  2. can conduct electricity
  3. have metallic bonds
  4. is an oxide
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