What happens when KI solution is added to an aqueous solution of copper sulphate?

What is the co-ordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate ? Why is that no precipitate of copper sulphide is obtained when H_2 S(g) is passed through this solution ?

Which compound is formed when excess of KCN is added to an aqueous solution of copper sulphate

What happens when a piece of a. Al metal is added to a dilute solution of HCl. b. Zn metal is added to an aqueous solution of copper sulphate c. Ag metal is added to an aqueous copper sulphate solution. Also write a balanced chemical equation if reaction occurs.

Write two observations that you will make when an iron nail is kept in an aqueous solution of copper sulphate. Write the chemical equations for this reactions.

What happens when benzene is added to hydrogen.

A silver spoon is kept immersed in an aqueous solution of copper sulphate. What change would you observe in the spoon and in the solution? Justify your answer.

What happens when water is added to ethene and propene?

What would you observe when zinc is added to a solution of iron (II) sulphate ? Write the chemical reaction that take place