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Standard X

Chemistry

Zinc Ion

A colourless ...

Question

A colourless mixture of two substances (A) and (B) (excess) is soluble in $H_{2} O$ , separately. (A) turns blue litmus red and (B) turns red litmus blue. (A) gives white ppt. with (B), which dissolves in excess of (B) forming (C). (A) when placed in moist air gives fumes and can form a dimer. (A) gives white ppt. with ${N H}_{4} C l$ and ${N H}_{4} O H$ soluble in (B). (A) also gives white precipitate with ${A g N O}_{3}$ soluble in ${N H}_{4} O H$ .
Thus, colourless mixture contains ___________.

{Z n C l}_{2}, N a O H

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{A l C l}_{3}, N a C l

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{A l C l}_{3}, N a O H

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{C r C l}_{3}, N a O H

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Solution

The correct option is C ${A l C l}_{3}, N a O H$
The colourless mixture contains ${A l C l}_{3}$ as A and $N a O H$ as B which is present in excess.

${A l C l}_{3}$ is acidic in nature. It turns blue litmus red.

$N a O H$ is alkaline in nature. It turns red litmus blue.

${A l C l}_{3}$ reacts with $N a O H$ to give a white ppt of $A l (O H)_{3}$ which is soluble in excess of $N a O H$ .

Therefore, C is the correct option.

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Similar questions

A colourless mixture of two substances, (A) and (B) (excess) is soluble in

H_{2} O

, separately. (A) turns blue litmus red and (B) turns red litmus blue. (A) gives white ppt. with (B), which dissolves in excess of (B) forming (C). (A) when placed in moist air gives fumes and can form dimer. (A) gives white ppt. with

{N H}_{4} C l

and

{N H}_{4} O H

soluble in (B). (A) also gives white precipitate with

{A g N O}_{3}

soluble in

{N H}_{4} O H

Thus, dimer formed has _______ bonding .

Q. A colourless mixture of two substances (A) and (B) (excess) is soluble in

H_{2} O

{N H}_{4} C l

and

{N H}_{4} O H

soluble in (B). (A) also gives white precipitate with

{A g N O}_{3}

soluble in

{N H}_{4} O H

Thus, A turns blue litmus red. It is due to acidic solution because of ________.

Q. Colourless salt (A) give white ppt (B) with NaOH; ppt (B) dissolves in excess of NaOH to form (C). On passing

H_{2} S

gas into (C) white ppt (D) appears. (A) also gives white ppt (E) with

A g N O_{3}

solution. What is (A)?

Q. Colourless solution of (A) gives white precipitate (B) with

A g N O_{3}

solution, soluble in aq.

N H_{3}

. (A) also gives white precipiatete (C) with NaOH soluble in excess of it forming (D). (D) gives white precipiate (E) with

H_{2} S

.(A), (B), (C), (D) and (E) are as follows.

(A) :

Z n C l_{2}

(B) :

A g C l

Z n (O H)_{2}

(D) :

N a_{2} Z n O_{2}

(E) :

Z n S

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

.
Addition of

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

.
The compound

A

is:

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