Class XI

 If hydrogen (H+) of an acid is fully replaced by a metal, product is a
  1. Neutral oxides
  2. Amphoteric oxides
  3. Acid salt
  4. Salt
In fractionating column of fractional distillation, higher in column
  1. Temperature becomes lower
  2. Temperature becomes higher
  3. Minimum absorption is carried out
  4. Risks of sublimation exists
 In a reaction between CuSO4(s) and Zn(s),
  1. Zinc experiences an increase in oxidation state
  2. undergoes oxidation
  3. Zinc undergoes oxidation
  4. all of these
Consider equation PbO + NaOH + H2O → Na2Pb(OH)4. balancing of equation requires how much moles of NaOH?
  1. 1
  2. 2
  3. 3
  4. 4
Reduction involves
  1. Gain in hydrogen
  2. Loss of oxygen
  3. Loss of hydrogen
  4. Both A and B
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