You have 3 metals and salt solutions of these metals. Test
tube Solution

A	Magnesium sulphate
B	Copper sulphate
C	Ferrous sulphate

When you were away, your younger brother added a metal in a blue coloured solution to make it green. Which of the following could have happened?

Q. You have 3 metals and salt solutions of these metals. Test
tube Solution

A	Magnesium sulphate
B	Copper sulphate
C	Ferrous sulphate

HINT: (Magnesium sulphate -white colour, copper sulphate -blue colour, Ferrous sulphate- green colour )
When you were away, your younger brother added a metal in a blue coloured solution to make it green. Which of the following could have happened?

Q. Samples of four metals $A,B,C\text{and}D$ were taken and added to ferrous sulphate solution one by one in different beakers. Metals $A\text{and}B$ showed changes in colour, whereas metals $C\text{and}D$ did not. What do you infer from this?

Q.

A student took four test tubes containing solutions of different colours marked I (colourless) II(Blue), III (Orange) and IV (Pale green) .
Which of the tubes contain copper sulphate solution and ferrous
sulphate solution?

Q.

On the basis of the reactivity series of metals, predict how these metals will react with each of the following salt solutions:

Metals: magnesium, zinc, copper, iron, and potassium

Salt solutions: magnesium sulphate, zinc sulphate, copper sulphate, iron sulphate,and potassium sulphate

Q. A student added few pieces of aluminium metal to two test tube A and B containing aqueous solution of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test lube C and D containing aqueous solution 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 ?