HARD

Earn 100

Which of the following is/are correct for potassium ferrocyanide?

50% studentsanswered this correctly

Important Questions on Inorganic Qualitative Analysis

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

When

H_{2} S

gas is passed through a hot acidic aqueous solution containing

{Al}^{3 +}, {Cu}^{2 +}, {Pb}^{2 +}

and

{Ni}^{2 +},

a precipitate is formed which consists of

HARD

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

An inorganic Compound

' X'

on treatment with concentrated

H_{2} {SO}_{4}

produces brown fumes and gives dark brown ring with

{FeSO}_{4}

in presence of concentrated

H_{2} {SO}_{4}

. Also Compound

' X'

gives precipitate

' Y'

, when its solution in dilute

HCl

is treated with

H_{2} S

gas. The precipitate

' Y'

on treatment with concentrated

{HNO}_{3}

followed by excess of

{NH}_{4} OH

further gives deep blue coloured solution, Compound

' X'

is:

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

The incorrect statement is:

EASY

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

To an aqueous solution containing ions such as

{Al}^{3 +}, {Zn}^{2 +}, {Ca}^{2 +}, {Fe}^{3 +}, {Ni}^{2 +}, {Ba}^{2 +}

and

{Cu}^{2 +}

was added

conc . HCl

, followed by

H_{2} S

. The total number of cations precipitated during this reaction is/are :

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

Copper sulphate solution reacts with

KCN

to give

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

When

H_{2} S

gas is passed into a mixture of

{Mn}^{2 +}, {Ni}^{2 +}, {Cu}^{2 +}

and

{Hg}^{2 +}

ion in an acidified aqueous solution, the precipitates formed are

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

Consider the sulphides

HgS, PbS, CuS, {Sb}_{2} S_{3}, {As}_{2} S_{3}

and

CdS .

Number of these sulphides soluble in

50 % {HNO}_{3}

is ___________ .

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

For the following Assertion and Reason, the correct option is

Assertion (A) : When $Cu$ (II) and sulphide ions are mixed, they react together extremely quickly to give a solid.

Reason (R) : The equilibrium constant of ${Cu}^{2 +} (aq) + S^{2 -} (aq) ⇌ CuS (s)$ is high because the solubility product is low.

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

The cation that will not be precipitated by

H_{2} S

in the presence of dil HCl is:

HARD

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

A white crystalline substance dissolves in water. On passing

H_{2} S

in this solution in acidic medium, a black precipitate is obtained. The black precipitate dissolves completely in hot

H N O_{3}

. On adding a few drops of conc.

H_{2} S O_{4}

a white precipitate is obtained. This precipitate is that of

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

H_{2} S

gas when passed through a solution containing

H C l

precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because

EASY

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

Solution of II A group precipitate in dil.

H N O_{3}

when treated with

N H_{4} O H

becomes blue because of the presence of

HARD

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

C u^{2 +}

ions will be reduced to

C u^{+}

ions by the addition of an aqueous solution of

HARD

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

Potassium hexacyanoferrate

(II)

is used in the identification of

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

KI

and

{C u S O}_{4}

solutions on mixing produce

EASY

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

A metal nitrate reacts with

K I

to give a black precipitate which on addition of excess of

K I

convert into orange colour solution. The cation of the metal nitrate is

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

In an acidified aqueous solution of

M n^{2 +}, N i^{2 +}, C u^{2 +}

and

H g^{2 +}

ions,

H_{2} S

gas was passed. Precipitates are

HARD

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

Excess of KI reacts with

{C u S O}_{4}

solution and then

{N a}_{2} S_{2} O_{3}

solution is added to it. Which of the statements is incorrect for this reaction?

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

H_{2} S

will precipitate the sulphides of all the metals from the solution of chlorides of

C u, Z n

and

C d,

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Copper(II) Ion

When

H_{2} S

gas is passed through the

H C l

containing aqueous solutions of

C u {C l}_{2}

H g {C l}_{2}

B i {C l}_{3}

and

C o {C l}_{2}

, which does not precipitate out

Which of the following is/are correct for potassium ferrocyanide?

Important Questions on Inorganic Qualitative Analysis

Learn and Prepare for any exam you want !