A student took four test tubes I,II,III and IV containing aluminium sulphate, copper sulphate, ferrous sulphate and zinc sulphate solutions respectively. He placed iron strips in each one of them. after some time he found a brown deposite formed in test -tube marked:

Sandhya took three beakers A, B and C containing Zinc Sulphate, Silver Sulphate and Iron (II) Sulphate solutions respectively. Copper pieces were added to each beaker. The solution will appear blue in the case of:

Solutions of copper sulphate, iron sulphate and zinc sulphate are prepared are marked I,II and III respectively. Few pieces of aluminium are added to each solution. After some time a change will be observed in

Solutions of Copper sulphate, Iron sulphate and Sodium sulphate are marked as X, Y and Z respectively. Few pieces of Aluminium are added to each solution. In which solutions, change will be observed?

A student took four test tubes containing solutions of different colours marked I,II, III and IV as shown here. The test tubes containing copper sulphate solution and ferrous sulphate could be the tubes:

A student addd few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, the added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate. In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why ?