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Hardness of Water and Treatment

Identify the ...

Question

Identify the anion present in the compound Y is treated with Silver nitrate solution a white precipitate is obtained which is soluble in excess of Ammonium hydroxide solution?

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Solution

The Anion present is Chloride ion, Cl^-.
The compound may be Sodium chloride.
When sodium chloride reacts with silver nitrate to form a white precipitate of silver chloride and sodium nitrate.
NaCl (aq) + AgNO₃ (aq) ⇢ AgCl(s) + NaNO₃(aq)
On ionization NaCl which gives Na⁺ and Cl^- ions
Similarly AgNO₃becomes Ag⁺ and NO₃^-ions.
On reaction between these two components (NaCl and AgNO₃) Cation Na⁺combines with NO₃^-anion and anion Cl^-combines with Ag⁺ cation.
i.e the anion present in the given compound Y (NaCl) is Cl^-.

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Q. The questions (i) to (v) refer to the following salt solutions listed (a) to (f):
(a) Copper nitrate
(b) Iron (II) sulphate
(c) Iron (III) chloride
(d) Lead nitrate
(e) Magnesium sulphate
(f) Zinc chloride

(i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
(ii) Which two solution will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?
(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
(iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it?
(v) Which solution gives a white precipitate with excess ammonium hydroxide solution?

Q. The questions (i) to (v) refer to the following salt solutions listed A to F:
A. Copper nitrate
B. Iron (II) sulphate
C. Iron (III) chloride
D. Lead nitrate
E. Magnesium sulphate
F. Zinc chloride
(i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
(ii) Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?
(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
(iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it?
(v) Which solution gives a white precipitate with excess ammonium hydroxide solution?

Q. Identify the anion present in the following compounds:
When a solution of compound

Y

is treated with silver nitrate solution a white precipitate is obtained which is soluble in excess of ammonium hydroxide solution.

Which acid on mixing with silver nitrate solution produces a white precipitate which is soluble in excess ammonium hydroxide?

Identify the acid which matches the following description:

The acid on mixing with silver nitrate solution produces a white precipitate which is soluble in excess ammonium hydroxide.

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