When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide giving an inky blue solution. What is the cation [positive ion] present in solution B? What is the probable colur of solution B.

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Solution

$C u S O_{4} + 2 N H_{4} O H \to (N H_{4})_{2} S O_{4} + C u (O H)_{2} (p a l e - b l u e)$
The cation present in solution B is Copper $(C u^{+ 2}) .$

The color of solution B is Blue.

The pale blue precipitate of copper hydroxide dissolves in excess of ammonium hydroxide forming tetraamine copper [II] sulphate, an azure blue(deep blue) soluble complex salt.
$C u (O H)_{2} + (N H_{4})_{2} S O_{4} + 2 N H_{4} O H \to [C u (N H_{3})_{4}] S O_{4} + 4 H_{2} O$

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Q. When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide to give an inky blue solution. What is the cation [positive ion] present in solution B? What is the probable colour of solution B?

When ammonium hydroxide is added to solution B, a pale blue precipitate is formed . This pale blue precipitate dissolves in excess of ammonium hydroxide giving an inky blue solution. Name the cation present in solution B.

Q. (a) Sodium hydroxide solution is added to solution A. A white precipitate is formed which is insoluble in excess sodium hydroxide solution. Name the metal ion present in solution A.
(b) When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide to give an inky blue solution. Name the cation present in solution B. What is the probable colour of solution B?

Q. The following table shows the test a student performed on four different aqueous solution which are X, Y, Z and W. Based on the observations provided, identify the action 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.
To solution Y 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.
To solution W a small quantity of sodium hydroxide solution hydroxide solution is added and then in excess.	A white precipitate is formed which remains insoluble.
To a salt Z calcium hydroxide solution is added and then heated.	A pungent smelling gas turning moist red litmus paper blue is obtained.

Q. Three cations

A, B, C

are allowed to react with ammonium hydroxide solution.

A

and

B

produce a dirty green precipitate and a reddish brown precipitate respectively, both of which do not dissolve on further addition of

{N H}_{4} O H

C

gives pale blue colour precipitate with less amount of ammonium hydroxide and on further addition of

{N H}_{4} O H

, precipitate becomes soluble and deep blue colour solution is formed:

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