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Standard XII

Chemistry

Leaching

A metal X dis...

Question

A metal (X) dissolves both in dilute HCl and dilute NaOH to liberate $H_{2}$ . Addition of $N H_{4} C l$ and excess $N H_{4} O H$ to an HCl solution of X produce Y as a precipitate. Y is also produced by adding $N H_{4} C l$ to the NaOH solution of X. The species X and Y, respectively, are

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Solution

The correct option is B

$Z n C l_{2}$ gives no ppt with $N H_{4} C l + N H_{4} O H$ solution. But $A l C l_{3}$ gives gelatinious white ppt of $A l (O H)_{3}$ with $N H_{4} C l + N H_{4} O H$ .

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Similar questions

Q. 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 :

Q. A solution when diluted with water and boiled, gives a white precipitate. On addition of an excess of

N H_{4} C l / N H_{4} O H

, the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in

N H_{4} O H / N H_{4} C l

Q. Identify the salts

P

and

Q

from the observations given below:
When dilute

H C l

is added to a salt

Q

, a brisk effervescence is produced and the gas turns lime water milky.
When

N H_{4} O H

solution is added to the above mixture (after adding dilute

H C l

), it produces a white precipitate which is soluble in excess

N H_{4} O H

solution.

Q. 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

N H_{4} O H

and on passing

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:
(A) :

Z n C O_{3}

, (B) :

C O_{2}

, (C) :

Z n O

, (D) :

Z n S

and (E) :

Z n (O H)_{2}

If true enter 1, else enter 0.

Q. A solution when diluted with

H_{2} O

and boiled, gives a white precipitate. On the addition of excess

N H_{4} C l / N H_{4} O H

, the volume of the precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in

N H_{4} O H / N H_{4} C l

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A metal (X) dissolves both in dilute HCl and dilute NaOH to liberate H2. Addition of NH4Cl and excess NH4OH to an HCl solution of X produce Y as a precipitate. Y is also produced by adding NH4Cl to the NaOH solution of X. The species X and Y, respectively, are

The correct option is B ZnCl2 gives no ppt with NH4Cl+NH4OH solution. But AlCl3 gives gelatinious white ppt of Al(OH)3 with NH4Cl+NH4OH.

A metal (X) dissolves both in dilute HCl and dilute NaOH to liberate $H_{2}$ . Addition of $N H_{4} C l$ and excess $N H_{4} O H$ to an HCl solution of X produce Y as a precipitate. Y is also produced by adding $N H_{4} C l$ to the NaOH solution of X. The species X and Y, respectively, are

The correct option is B

$Z n C l_{2}$ gives no ppt with $N H_{4} C l + N H_{4} O H$ solution. But $A l C l_{3}$ gives gelatinious white ppt of $A l (O H)_{3}$ with $N H_{4} C l + N H_{4} O H$ .