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Standard X

Chemistry

Reactions of Chemical Equilibrium

An aqueous so...

Question

An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and a filtrate (Q). The precipitate (P) was found to dissolve in hot water. The filtrate (Q) remained unchanged when treated with $H_{2} S$ in a dilute mineral acid medium. However, it gave a precipitate (R) with $H_{2} S$ in an ammoniacal medium. The precipitate R gave a coloured solution (S) when treated with $H_{2} O_{2}$ in an aqueous NaOH medium.

The precipitate P contains

$P b^{2 +}$

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$H g_{2}^{2 +}$

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$A g^{+}$

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$H g^{2 +}$

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Solution

The correct option is A
$P b^{2 +}$

See the following reactions:

$P b_{2}^{+} + 2 H C l \to P b C l_{2} P h o t w a t e r - ---- \to S o l u b l e$

$C r^{3 +} H_{2} S - ------ \to a m m o n i a c a l C r (O H)_{3} p p t H_{2} O_{2} - --- \to N a O H C r O_{4}^{-} S$

This confirms the presence of lead in precipitate P.

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Similar questions

An aqueous solution of a mixture of two inorganic salts, when treated with dilute

H C l

, gave a precipitate (P) and filtrate (Q). The precipitate P was found to dissolve in hot water.

The filtrate (Q) remained unchanged, when treated with

H_{2} S

in dilute mineral acid medium. However, it gave a precipitate (R) with

H_{2} S

in an ammoniacal medium. The precipitate R gave a coloured solution (S ), when treated with

H_{2} O_{2}

in an aqueous NaOH medium.

The coloured solution S contains:

Q. The aqueous solution of inorganic compound

(X)

yielded a white precipitate when treated with dilute

H N O_{3}

and

A g N O_{3}

. Another sample of the solution of

(X)

when treated with

N a O H

gave a white precipitate first which dissolved in excess of

N a O H

yielding a colorless solution. When

H_{2} S

gas was passed through that solution a white precipitate was obtained.

Identify the compound

(X)

and give the reactions.

Q. An aqueous solution of salt (A), gives white crystalline precipitate (B) with

N a C l

solution. The filtrate gives a black precipitate (C) when

H_{2} S

is passed through it. Compound (B) is dissolves in hot water and the solution gives a yellow precipitate (D) on treating with

N a I

and cooling. The compound (A) does not give any gas with dilute

H C l

but liberates reddish brown gas on heating.

Compound (A) is _________.

Q. An aqueous solution of a substance gives a white precipitate on treatment with dil

H C l

, which dissolved on heating. On passing

H_{2} S

in hot acidic solution a black precipitate is formed. The substance is:

Q. A colourless aqueous solution contain nitrates of two metal, when it is added to an aqueous solution of

N a C l

, a white precipitate ws formed. This precipitate was found to be partially soluble in hot water to give a residue

P

and a solution

Q

. The residue

P

was solublein aq. in

N H_{3}

and also in excess sodium thiosulfate. The hot solution

Q

gave a yellow precipitate with

K I

. The metals

X

and

Y

, respectively, are:

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The correct option is A Pb2+ See the following reactions: Pb+2+2HCl→PbCl2Phot water−−−−−→Soluble Cr3+H2S−−−−−−−→ammoniacalCr(OH)3pptH2O2−−−−→NaOHCrO−4S This confirms the presence of lead in precipitate P.