A metal X forms a salt XS04. The salt XS04 forms a clear solution in water which reacts with sodium hydroxide solution to form a blue precipitate Y. Metal X is used in making electric wires and alloys like brass.
(a) What do you think metal X could be?
(b) Write the name, formula and colour of salt X S04
(c) What is the blue precipitate Y?
(d) Write a chemical equation of the reaction which takes place when salt XS04 reacts with sodium hydroxide solution. Give the state symbols of all the reactants and products which occur in the above equation.
(a) Metal X is copper, Cu.
(b) Formula for salt XSO4 is CuSO4
And colour is “Blue”.
(c) Blue precipitate is Copper Hydroxide, Cu(OH)2
(d) CuS04 (aq.) +2NaOH (aq.) 
Cu(OH)2 (s) + Na 2S04 (aq.)
Above is the chemical equation of the reaction.
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