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
2Pb(NO3)2 → 2PbO + nA + O2 What is nA in the given reaction?
  1. 4NO
  2. 4NO2
  3. 2PbNO2
  4. NO2
When the gases sulphur dioxide and hydrogen sulphide mix in the presence of water, the reaction SO2 + 2H2S → 2H2O + 3S occurs. Here hydrogen sulphide is acting as
  1. anoxidising agent
  2. a reducing agent
  3. a dehydrating agent
  4. a catalyst
Amino acid is formed by decomposition of which component of our diet?
  1. Carbohydrate
  2. Starch
  3. Protein
  4. Fat
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