To a salt soln 'Y' a small quantity of `NH_(4)OH` soln. is added slowly & then in excess. A pale blue precipitate is formed which dissolves in excess to form a clear inky blue soln. Identify the positive ion in the salt 'Y'

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

Which salts form pale blue precipitates.

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 colour of solution B.

State two observations for : NH_(4)OH soln . Is added to zinc nitrate soln .slowly and then in excess.

A metal 'X' normally used for making calorimeters is heated in abundant supply of air until a black coloured residue ' Y' is obtained. This Y reacts with sulphuric acid to form blue coloured salt 'Z'. When to this solution little of ammonium hydroxide was added, pale blue precipitates of 'A' are obtained. This 'A' dissolves in excess of ammonium hydroxide to form a deep blue solution B. Identify the metal X and write the equations for the formation of various compounds i.e., Y, Z, A and B.

Salts M, N, O, P and Q undergo reactiom (i) to (v) respectively. Identify the cation present in these salts on the basis of these reaction. Tabulate your answer in the format given below. 1. When sodium hydroxide solution is added to the salt M, and heated strongly a colourless gas with a pungent smell is evolved which turm red litmus paper blue and gives dense white fumes with a moist glass rod with hydrochloric acid. 2. Addition of dilute hydrochloric acid to a solution of N gives a thick white precipitate which is soluble in hot water. 3. When ammonium hydroxide solution is added to the solution of 0 a light blue precipitate is obtained which is soluble in excess of ammonium hydroxide to form an inteme deep blue solution. 4. When ammonium hydroxide solution is added to the solution of P reddish brown (mustard colour) precipitate is obtained which ,is insoluble even in the excess of ammonium hydroxide solution. 5. When sodium hydroxide solution is added to the solution of Q a which coloured gelatinous precipitate is obtained which is soluble in excess of sodium hydroxide to form a clear solution

Identify the cation (positive ion) and anion (negative ion) in - 'A','B' & 'C'. Also identify P, Q, R, S, T, U, V, W. a] Substance 'A' is water soluble and gives a curdy white precipitate 'P' with silver nitrate solution. 'P' is soluble in ammonium hydroxide but insoluble in dil. HNO_3 . Substance 'A' reacts with ammonium hydroxide solution to give a white precipitate ' soluble in excess of NH_4OH . b] A solution of substance 'B' is added to barium chloride solution. A white ppt. 'R' is formed, insoluble in dil. HCl or HNO_3 . A dirty green ppt. 'S' is formed on addition of ammonium hydroxide to a solution of 'B' and the precipitate is insoluble in excess of ammonium hydroxide. c] Substance 'C' is a coloured, crystalline salt which on heating decomposes leaving a black residue 'T'. On addition of copper turnings and conc. H_2SO_4 to 'C' a coloured acidic gas 'U' is evolved on heating. A solution of'C' is added to NaOH soln. until in excess. A pale blue ppt. 'P' is obtained insoluble in excess of NaOH A solution of 'C' is then added to NH_4OH soln. in excess to give an inky blue solution 'V'. A solution of 'C' is warmed and hydrogen sulphide gas is passed through it. A black ppt. 'W' appears.

Identify the cation in each of the following case Ammonium hydroxide solution when added to the solution gives bluish white precipitate which dissolves in excess to give deep blue solution.

Anhydrous white solid (A) on addition of potassium iodine solution gave a brown precipitate which turned white (B) on addition of excees of hypo solution. When potasium cyanide is added to an aqeous Solution of (A) a white precipitate is formed which then dissolved in excess forming (C ) A Solution (%) of (A) on adding to a solution of white portion of egg produced violet colouration in alkaline medium (i.e) in presence of NaOH) identify compound (A) and explain the reactions.

A metal 'X' used to make calorimeters reacts with concentrated nitric acid to form a soluble salt Y. When few drops of ammonium hydroxide are added pale blue precipitates 'Z' are obtained. These precipitates dissolve in excess of ammonium hydroxide to form deep blue solution 'A'. Identify the metal X and give all the chemical equations.