Class X

2Pb(NO3)2 → 2PbO + nA + O2 What is nA in the given reaction?
  1. 4NO
  2. 4NO2
  3. 2PbNO2
  4. NO2
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
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
The equation Cu + XHNO3 →Cu(NO3)2 + YNO2 + 2H2O, the value of X and Y are
  1. 3 and 1 respectively
  2. 8 and 6 respectively
  3. 4 and 2 respectively
  4. ) 7 and 1 respectively
In the reaction PbO+C→Pb+CO
  1. Pbo is oxidised
  2. C act as a reduction agent
  3. C act as an oxidising agent
  4. Reaction does not represent redox reaction
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