Class XI

 Extra stability is gained in third shell if number of electrons are
  1. 18
  2. 8
  3. 0
  4. 10
Products of reaction CuO + HNO3 → are
  1. Cu2NO3 + H2O
  2. Cu(NO3)2 + H2O
  3. Cu(NO3)2 + H2
  4. Cu(NO2)4 + H2
In Calcium Chloride, percentage composition of Calcium is
  1. 0.4621
  2. 0.3722
  3. 0.4621
  4. 0.36112
Many catalysts are
  1. Noble gases
  2. Transition metals
  3. Non-metals
  4. Inert gases
Consider equation ZnO + NaOH + H2O → Na2Zn(OH)4. Moles of H2O required to balance equation would be
  1. 1
  2. 2
  3. 3
  4. 4
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