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Classification of Colloids - Based on Phases

A soluble sol...

Question

A soluble solid is formed in a precipitation reaction.

A

True

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B

False

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Solution

The correct option is B False

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Q. When a piece of limestone reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z.
(a) What are X, Y and Z?
(b) Write equations for the reactions which take place:
(i) when limestone reacts with dilute HCl
(ii) when gas X reacts with lime water to form white precipitate Y
(iii) when excess of gas X dissolves white precipitate Y to form a soluble compound Z

Q. An inorganic compound

A

shows the following reaction:
(i) It is white solid, exists as dimer and fumes in the wet air.
(ii)It sublimes at

180^{\circ} C

and forms monomer if heated to

400^{\circ} C

.
(iii) Its aqueous solution turns blue litmus to red and gives a white precipitate with

A g N O_{3}

solution, which is soluble in

N H_{4} O H

N H_{4} O H

and NaOH separately to the solution of

A

gives a gelatinous precipitate which in however soluble in excess of

N a O H

A

Q. Complete the given table when

F e S O_{4}

N a O H

N H_{4} O H

\begin{matrix} For P b (N O_{3})_{2} & NaOH & N H_{4} O H Colour & Dirty green precipitate & X Solubility & Y & Precipitate formed will be insoluble in excess N a O H \end{matrix}

Q. A chloride which forms a precipitate that is soluble in excess of ammonium hydroxide, is

A colorless solid (A), when placed into water, produces heavy white turbidity to (B). Solid (A) gives a clear solution in

c o n c . H C l

H C l

solution is added to large amounts of water, (B) forms again. (B) dissolves in dilute HCl. When

H_{2} S

is passed through a suspension of (A) or (B); a black precipitate (C) forms, (C) is insoluble in yellow ammonium sulphide

(N H_{4})_{2} S

C o n c . H_{2} S O_{4}

added to solid (A) liberates gas (D). Gas(D) is water-soluble and gives white precipitate with mercuric salts (E) and not mercuric salts. The black precipitate (C) dissolves in

H N O_{3}

(1:1) to give a solution to which

H_{2} S O_{4}

is added followed by addition of

N H_{4} O H

when a white precipitate (F) is formed. (E) gives a black ppt. (G) with a solution of sodium stannite.

Compound B is not soluble in:

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Classification of Colloids - Based on Phases

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