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Describe the concentrated sulphuric acid test for iodide ion.

Important Questions on Inorganic Qualitative Analysis

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Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

When a mixture of

NaCl, K_{2} {Cr}_{2} O_{7}

and concentrated

H_{2} {SO}_{4}

is heated in a dry test tube, a red vapour

(X)

is evolved. This vapour

(X)

turns an aqueous solution of

NaOH

yellow due to the formation of

Y . X

and

Y,

respectively, are:

EASY

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

The blue colour produced when a starch solution is added to a solution containing traces of $I_{2} and KI$ is due to

(I) formation of ${I_{3}}^{-}$

(II) formation of an inclusion complex

(III) Oxidation of starch

(IV) Oxidation of $I_{2}$

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

{HgCl}_{2}

and

I_{2}

both when dissolved in water containing

I^{-}

ions the pair of species formed is:

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the before mentioned solution, a white precipitate is obtained which does not dissolve in dilute nitric acid. The anion is:

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

Write equations, including state symbols to describe the reactions taking place in the test tube between concentrated sulfuric acid and potassium iodide.

HARD

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

When a white solid (

X

) reacts with concentrated

H_{2} S O_{4}

, the products include pungent smelling gases and a dark brown solution containing a yellow precipitate. When aqueous solution of thiosulphate is added, the precipitate remains but the dark brown colour disappears. The compound '

X

' is

EASY

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

When

C l_{2}

water is added to a salt solution containing chloroform, chloroform layer turns violet. Salt contains

HARD

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

When

{CS}_{2}

layer containing both

{Br}_{2}

and

I_{2}

is shaken with excess of

{Cl}_{2}

water, the violet colour due to

I_{2}

disappears and a pale yellow colour appears in the solution. The disappearance of violet colour and appearance of pale yellow colour is due to the formation of :

HARD

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

Ozone when reacts with potassium iodide solution liberates certain product, which turns starch paper blue. The liberated substance is.......

EASY

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

A salt gives violet vapours when treated with conc.

H_{2} S O_{4}

. It contains

EASY

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

Copy and complete the equation below, including state symbols.
${AgNO}_{3} (aq) + NaI (aq) \to$

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

A violet colour is obtained on adding

{Cl}_{2}

water in solution of potassium halide in presence of chloroform and on adding excess of

{Cl}_{2}

water, violet colour disappears and colourless solution appears. The test shows the presence of

EASY

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

What is silver nitrate test?

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Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

A mixture of two colourless substances was dissolved in water. When gaseous

{Cl}_{2}

was passed through the solution, containing small quantity of

{CCl}_{4}

a violet colour developed in organic layer. Addition of

{BaCl}_{2}

to the original solution give a white precipitate. The mixture contains:

EASY

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

Starch-iodide paper is used to test the presence of-

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Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

Starch can be used as an indicator for the detection of traces of

HARD

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

Describe the test of iodide ion in presence of dilute nitric acid and silver nitrate solution, followed by the addition of dilute ammonia solution and then concentrated ammonia solution.

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Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

Working with a partner, discuss what you would see in a test tube in which concentrated sulfuric acid is added drop-wise to solid potassium iodide that you would not see if the acid was added to potassium chloride.

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Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

Cotyledons are also called-

MEDIUM

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Iodide Ion

. . . . . . . .

is formed when potassium iodide is heated with conc.

H_{2} {SO}_{4}

Describe the concentrated sulphuric acid test for iodide ion.

Important Questions on Inorganic Qualitative Analysis

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