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Potassium Dichromate

Explain the f...

Question

Explain the following :
(i) When $N a C l$ is added to $A g N O_{3}$ solution, a white precipitate is formed.
(ii) An aqueous solution of ammonium chloride is acidic in nature.

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Solution

(i) The silver nitrate test that there was an anion present in the solution, that will cause silver cations to precipitate silver usually as halides. Here, it precipitates as chlorides,
$A g N O_{3} + N a C l \to A g C l + N a N O_{3}$
white aqueous precipitate
(ii) When ammonium chloride is dissolved in water, it gives an acidic solution because ammonium ion is a strong conjugate acid of the weak base ammonia, but chloride ion is weak conjugate base of the strong acid hydrochloric acid.

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(a) Copper nitrate
(b) Iron (II) sulphate
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(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?
(v) Which solution gives a white precipitate with excess ammonium hydroxide solution?

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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?
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