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Identify the cation present in each of t...

Identify the cation present in each of the following compounds-W,X,Y,Z:
i] To solution, 'W', 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.
ii] To solution 'X' ammonium hydroxide is added in minimum quantity first and then in excess. A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution.
iii] To solution 'Y' a small amount of sodium hydroxide is added slowly and then in excess.A white insoluble precipitate is formed.
iv] To salt 'Z' - `Ca(OH)_2` soln. is added & heated. A pungent smelling gas turningmoist red litmus paper blue is obtained

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