Class XI

 In order to test presence of nitrates,
  1. Dilute HNO3 shall be added
  2. Dilute HCl shall be added
  3. Dilute NaOH s + Aluminum powder hall be added
  4. Dilute KOH with Al2O3 shall be added
Electronic configuration of chlorine atom is
  1. 2,6,8
  2. 2,8,8
  3. 2,8,7
  4. 2,8,1
 If atomic mass of copper is 63.546, mass percent of copper in Cu2O will be
  1. 0.7898
  2. 0.8098
  3. 0.8882
  4. 0.8678
With acids, universal indicators show a color
  1. Of red
  2. Of blue
  3. Of green
  4. Of violet
In a dry cell, polarization
  1. Cannot be prevented
  2. Is prevented through ammonium nitrate mixture
  3. Is prevented through magnese oxide
  4. Is prevented through a NaOH mixture
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