Class XI

 If nucleon number of fluorine is 19, proton number will be
  1. 4
  2. 8
  3. 17
  4. 19
 Hydrogen Sulfate (H2SO4) has
  1. Positive charge
  2. Negative charge
  3. Double negative charge
  4. Double positive charge
 If nucleon and neutron numbers are 27 and 14 respectively, number of electrons will be
  1. 11
  2. 12
  3. 14
  4. 13
 Lighter gases
  1. May be collected through downward delivery
  2. May be collected by upward displacement of air
  3. Are dried through conc. H2SO4
  4. Are dried through dilute H2SO4
If n=1, maximum number of electrons in a shell can be recalled through formulae
  1. 2n
  2. 2n2
  3. 2n3
  4. 2n4
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