Class XI

Oxidation involves
  1. Gain in oxygen
  2. Loss of hydrogen
  3. Reduction
  4. Both A and B
Number of replaceable hydrogen atoms in phosphoric acid is
  1. 1
  2. 2
  3. 3
  4. 4
 In electrolysis of copper purification, at cathode
  1. Pure copper gets deposited
  2. Object to be electroplated is kept
  3. Impure copper gets deposited
  4. CuSO4 gets deposited
Mass of an electron is
  1. 1⁄1840 of a proton
  2. 1⁄1840 of a neutron
  3. 1840 times of a proton
  4. Both A and B
Difficulty of discharge is highest in
  1. Hydroxide ions
  2. Bromide ion
  3. Nitrate ion
  4. Chloride ions
Time Elapsed

HR : MIN : SEC
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