Class XI

 In a reaction between CuSO4(s) and Zn(s),
  1. Copper gains electrons
  2. Copper is being reduced
  3. Copper experiences a decrease in oxidation state
  4. All of these
Molar mass of potassium hydrogen carbonate KHCO3 is
  1. 90.15g/mol
  2. 100.115g/mol
  3. 111.127g/mol
  4. 119.21g/mol
Most reactive metal in given series is
  1. Magnesium
  2. Zinc
  3. Iron
  4. Tin
Onion juice is
  1. Acidic
  2. Alkaline
  3. Neutral
  4. Dasic
Reduction involves
  1. Loss of oxygen
  2. Gain in hydrogen
  3. Gain in oxygen
  4. Oss of electrons
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