Two metals $X$ and $Y$ form the salts ${XSO}_{4}$ and $Y_{2} {SO}_{4}$ , respectively. The solution of salt ${XSO}_{4}$ is blue in colour whereas that of $Y_{2} {SO}_{4}$ is colourless. When barium chloride solution is added to ${XSO}_{4}$ solution, a white precipitate $Z$ is formed along with a salt which turns the solution green. When barium chloride solution is added to $Y_{2} {SO}_{4}$ solution, then the same white precipitate $Z$ is formed along with a colourless common salt solution.
What is the name and formula of white precipitate $Z$ ? Which color is acquired by the solution?

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Solution

Precipitate $Z$
$Z$ is barium sulfate $({BaSO}_{4})$ which is a white solid and is insoluble in water.
Color acquired by the solution:
1. When copper sulphate $({CuSO}_{4})$ reacts with barium chloride $({BaCl}_{2})$ then a green solution of calcium chloride $({CaCl}_{2})$ alongside white precipitate of barium sulfate is formed.
${CuSO}_{4} (aq) + {BaCl}_{2} (aq) \to {CuCl}_{2} (aq) + {BaSO}_{4} (s)$
2. When sodium sulfate $({Na}_{2} {SO}_{4})$ reacts with barium chloride $({BaCl}_{2})$ then a colorless solution of sodium chloride $(NaCl)$ alongside white precipitate of barium sulfate is formed.
${BaCl}_{2} (aq) + {Na}_{2} {SO}_{4} (aq) \to {BaSO}_{4} (s) + 2 NaCl (aq)$
Therefore, compound $Z$ is barium sulfate $({BaSO}_{4})$ and the solution can be green or colorless.

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Two metals X and Y form the salts $X S O_{4}$ and $Y_{2} S O_{4}$ , respectively. The solution of salt $X S O_{4}$ is blue in colour whereas that of $Y_{2} S O_{4}$ is colourless. When barium chloride solution is added to $X S O_{4}$ solution, then a white precipitate Z is formed along with a salt which turns the solution green. And when barium chloride solution is added to $Y_{2} S O_{4}$ solution, then the same white precipitate Z is formed along with colourless common salt solution.

(a) What could the metal X and Y be ?

(b) Write the name and formula of salt $X S O_{4}$ .

(d) What is the name and formla of white precipitate Z ?

(e) Write the name and formula of the salt which turns the solution green in the first case.

Q. Two metals X and Y form the salts XSO₄ and Y₂SO₄, respectively. The solution of salt XSO₄ is blue in colour whereas that of Y₂SO₄ is colourless. When barium chloride solution is added to XSO₄ solution, then a white precipitate Z is formed alongwith a salt which turns the solution green. And when barium chloride solution is added to Y₂SO₄ solution, then the same white precipitate Z is formed alongwith colourless common salt solution.
(a) What could the metals X and Y be?
(b) Write the name and formula of salt XSO₄.
(c) Write the name and formula of salt Y₂SO₄.
(d) What is the name and formula of white precipitate Z?
(e) Write the name and formula of the salt which turns the solution green in the first case.

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?

Two metals $X$ and $Y$ form the salts ${XSO}_{4}$ and $Y_{2} {SO}_{4}$ , respectively. The solution of salt ${XSO}_{4}$ is blue in colour whereas that of $Y_{2} {SO}_{4}$ is colourless. When barium chloride solution is added to ${XSO}_{4}$ solution, a white precipitate $Z$ is formed along with a salt which turns the solution green. When barium chloride solution is added to $Y_{2} {SO}_{4}$ solution, then the same white precipitate $Z$ is formed along with a colorless common salt solution.
What could the metals $X$ and $Y$ be?

The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is:

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