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Variable Oxidation States

Identify the ...

Question

Identify the acid which matches the following description $(i)$ to $(v)$ .
The acid on mixing with silver nitrate solution produces a white precipitate which is soluble in excess ammonium hydroxide.

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Solution

Hydrochloric acid reacts with silver nitrate solution to form white precipitate of silver chloride.
$A g N O_{3} + H C l \to A g C l + H N O_{3}$
This silver chloride is soluble in excess of ammonium hydroxide but are insoluble in dilute $H N O_{3}$ .
$A g C l + 2 N H_{4} O H \to A g (N H_{3})_{2} C l + 2 H_{2} O$

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is treated with silver nitrate solution a white precipitate is obtained which is soluble in excess of 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
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D. Lead nitrate
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(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?
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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
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(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?
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