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Werner's Coordination Theory

Number of com...

Question

Number of compounds which give white precipitate on addition of $N a_{2} S$ (aq.) in the following compounds;

$Z n S O_{3},$ soda alum, $K_{2} S O_{4}, N a_{2} S O_{4}, A l C l_{3}, C r_{2} (S O_{4})_{3}$ .

A

3

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B

4

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C

5

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D

2

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Solution

The correct option is A 3
$Z n S O_{3}$ reacts with $N a_{2} S$ to form $Z n S$ , which is white in colour.
Soda Alum and $A l C l_{3}$ reacts with $N a_{2} S$ to form $A l_{2} S_{3}$ , which is white in colour.

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Similar questions

Q. Which of the following organic compounds will give white precipitate with

A g N O_{3} ?

Q. In the following sequence of reactions, identify the compounds (A), (B), (C) and (D):

N a_{2} C O_{3} S O_{2} - - \to (A) N a_{2} C O_{3} - ---- \to (B) S \to (C) A g N O_{3} - --- \to (D)

Q. Among the following coordination compounds, the one giving a white precipitate with

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A white amorphous powder (A) when heated gives a colourless gas (B), which turns lime water milky and the residue (C) which is yellow when hot but white when cold. The residue (C) dissolves in dilute HCl and the resulting solution gives a white precipitate on addition of potassium ferrocyanide solution. (A) dissolves in dilute HCl with the evolution of a gas which is identical in all respects with (B). The solution of (A) as obtained above gives a white precipitate (D) on addition of excess of

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H_{2} S

. Another portion of this solution gives initially a white precipitate (E) on addition of NaOH which dissolves in excess of it. Compounds (A) to (D) are identified as:

Q. An unknown inorganic compound

(X)

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