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Standard X

Chemistry

Zinc Ion

An inorganic ...

Question

An inorganic Lewis acid $(X)$ fumes in moist air, and intensity of fumes increases when a rod dipped in $N H_{4} O H$ is brought near to it. An acidic solution of $(X)$ on addition of $N H_{4} C l$ and $N H_{4} O H$ gives a precipitate which dissolves in $N a O H$ solution. An acidic solution of $(X)$ does not give precipitate with $H_{2} S$ . Hence, the compound $(X)$ is :

F e C l_{3}

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A l C l_{3}

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S n C l_{2}

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Z n C l_{2}

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Solution

The correct option is B $A l C l_{3}$
The compound $(X)$ is $A l C l_{3}$ .
$A l C l_{3} + 3 H_{2} O ⟶ A l {(O H)}_{3} ↓ + 3 H C l$
(moisture) (fumes)
$A l C l_{3} + 3 N H_{4} O H ⟶ A l {(O H)}_{3} ↓ + 3 N H_{4} C l$
$A l {(O H)}_{3} + N a O H ⟶ N a A l O_{2} + 2 H_{2} O$ $A l C l_{3} + H_{2} S + H^{+} ⟹ N o p p t .$

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Similar questions

Q. An inorganic Lewis acid (X) shows the following reactions:

(i) It fumes in moist air.
(ii) The intensity of fumes increases when a rod diffed in

{N H}_{4} O H

is brought near it.
(iii) An acidic solution of (X) on addition of

{N H}_{4} C l

and

{N H}_{4} O H

gives a precipitate which dissolves in

N a O H

solution.
(iv) An acidic solution of (X) does not give precipitate with

H_{2} S

. Compound (X) is identified as

{A l C l}_{3}

If the given statement is true enter 1, else enter 0.

Q. An acidic solution of ‘X’ does not give precipitate on passing

H_{2} S

gas. ‘X’ gives a white precipitate when

N H_{4} O H

is added to it. The white precipitate dissolves in excess of

N a O H

solution. Pure ‘X’ fumes in air and dense white fumes are obtained when a glass rod dipped in

N H_{4} O H

is held in the fumes. The compound ‘X’ is:

Q. An acidic solution of ‘X’ does not give precipitate on passing

H_{2} S

gas. ‘X’ gives a white precipitate when

N H_{4} O H

is added to it. The white precipitate dissolves in excess of

N a O H

solution. Pure ‘X’ fumes in air and dense white fumes are obtained when a glass rod dipped in

N H_{4} O H

is held in the fumes. The compound ‘X’ is:

Q. The aqueous solution of an inorganic compound (X) gives white precipitate with

N H_{4} O H

which does not dissolve in excess of

N H_{4} O H

This aqueous solution also gives white precipitate with

A g N O_{3}

and the precipitate is soluble in dilute

H N O_{3}

. Here, (X) is :

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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The correct option is B AlCl3The compound (X) is AlCl3.AlCl3 + 3H2O ⟶ Al(OH)3↓ + 3HCl(moisture) (fumes)AlCl3+3NH4OH⟶Al(OH)3 ↓ + 3NH4ClAl(OH)3 +NaOH ⟶NaAlO2+2H2OAlCl3+H2S+H+⟹Noppt.