Class X

Some crystals of copper sulphate were dissolved in water. The colour of the solution obtained would be
  1. red
  2. blue
  3. green
  4. brown
Which of the following reaction will not take place?
  1. Zn + FeSO4 → ZnSO4 + Fe
  2. 2KI + Cl2 → 2KCl + I2
  3. ) Zn + MgSO4 → ZnSO4 + Mg
  4. ) Zn + MgSO4 → ZnSO4 + Mg
In the reaction, 2FeCl2 + Cl2 →2FeCl3 , chlorine may be regarded as
  1. an oxidizing agent
  2. a reducing agent
  3. a catalyst
  4. ) providing an inert medium
When dilute HCl is added to zinc pieces taken in a test tube
  1. No change takes place
  2. A pungent smelling gas gets liberated
  3. the colour of the solution becomes yellow
  4. small bubbles of H₂ gas appear on the surface of zinc pieces
An element, which never has a positive oxidation state in any of its compounds, is
  1. Boron
  2. Oxygen
  3. Chlorine
  4. Fluorine
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