The following table shows the test a student performed on four different aqueous solutions which are X, Y, Z and W. Based on the observations provided, identify the cation present: Chemical test Observation Conclusion To solution X, ammoniumhydroxide is added in minimum quantity first and then in excess A dirty white precipitate isformed which dissolves inexcess to form a clear solution (1) To solution Y ammoniumhydroxide is added in the minimum quantity first and then in excess A pale blue precipitate isformed which dissolves inexcess to form a clear inky bluesolution. (2) To solution W a small quantity of sodium hydroxide solution isadded and then in excess. A white precipitate is formedwhich remains insoluble. (3) To a salt Z calcium hydroxidethe solution is added and thenheated. A pungent smelling gas turningmoist red litmus paper blue isobtained. (4)

1)Zn2+ 2) Cu2+ 3) Ca2+ 4) `NH_4^(+)`

The Following Table Shows the Test a Student Performed on Four Different Aqueous Solutions Which Are X, Y, Z and W. Based on the Observations Provided, Identify the Cation Present: - Chemistry

The following table shows the test a student performed on four different aqueous solutions which are X, Y, Z and W. Based on the observations provided, identify the cation present:

Chemical test	Observation	Conclusion
To solution X, ammonium hydroxide is added in minimum quantity first and then in excess	A dirty white precipitate is formed which dissolves in excess to form a clear solution	(1)
To solution Y ammonium hydroxide is added in the minimum quantity first and then in excess	A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution.	(2)
To solution W a small quantity of sodium hydroxide solution is added and then in excess.	A white precipitate is formed which remains insoluble.	(3)
To a salt Z calcium hydroxide the solution is added and then heated.	A pungent smelling gas turning moist red litmus paper blue is obtained.	(4)