Distinguish between the following pair of compounds using a reagent as a chemical test: Magnesium chloride and magnesium nitrate solution.

Silver nitrate can be used to test chloride ion present in a compound thus magnesium chloride reacts with silver nitrate and forms a white precipitate of silver chloride and an aqueous solution of magnesium nitrate, but magnesium nitrate does not react with silver nitrate.

A sample of mineral water contained these ions: Name of ion Concentration(milligrams/ dm 3 ) calcium 55 chloride 37 hydrogen carbonate 248 magnesium 19 nitrate 0.05 potassium 1 sodium 24 sulphate 13 Which of the ions will react with barium nitrate solution to give a white precipitate?

Amongst all the ions given in the list, sulfate ion will react with barium nitrate solution to give a white precipitate. The hydrochloric acid is added first to remove any carbonate ions that might be present (they would also produce a white precipitate, giving a false positive result). Barium chloride solution can be used instead of barium nitrate solution.

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Barium chloride salt solution used for testing sulphate radical.

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Important Questions on Inorganic Qualitative Analysis

EASY

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

Reaction of an inorganic sulphite

X

with dilute

H_{2} {SO}_{4}

generated compound

Y

. Reaction of

Y

with

NaOH

gives

X

. Further, the reaction of

X

with

Y

and water affords compound

Z, Y

and

X

, respectively, are :

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

The sodium salt of an organic acid

X

produces effervescence with concentrated

H_{2} {SO}_{4}

X

reacts with the acidified aqueous

{CaCl}_{2}

solution to give a white precipitate which decolourises acidic solution of

{KMnO}_{4}

X

EASY

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

On heating, lead (ll) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to ablue solid (C). The oxidation number of nitrogen in solid (C) is:

EASY

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

In the detection of II group acid radical, the salt containing chloride is treated with concentrated sulphuric acid, the colourless gas is liberated. The name of the gas is

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

A chloride salt solution acidified with dil.

{HNO}_{3}

gives a curdy white precipitate,

[A]

, on addition of

{AgNO}_{3}

. [A] on treatment with

{NH}_{4} OH

gives a clear solution, B.

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

Sodium nitroprusside, when added to an alkaline solution of sulphide ions, produce a

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

{HgCl}_{2}

and

I_{2}

both when dissolved in water containing

I^{-}

ions the pair of species formed is:

HARD

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Sulphate 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:

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

When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral

{FeCl}_{3}

, it gave deep red colour which disappeared on boiling and a brown red ppt was formed. The mixture contains

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Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Sulphate 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:

EASY

Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Sulphate 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 $I_{2}$

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

Which combines with

{Fe}^{2 +}

to form brown complex?

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

Consider the following reactions:

NaCl + K_{2} {Cr}_{2} O_{7} + \underset{(Conc.)}{H_{2} {SO}_{4}} \to (A) +

side products

(A) + N a O H \to (B) +

side products

(B) + \underset{(dilute)}{H_{2} S O_{4}} + H_{2} O_{2} \to (C) +

side products
The sum of the total number of atoms in one molecule each of

(A), (B)

and

(C)

is ________

HARD

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

The reagent(s) that can selectively precipitate

S^{2 -}

from a mixture of

S^{2 -}

and

S O_{4}^{2 -}

in aqueous solution is (are)

HARD

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

Distinguish between the following pair of compounds using a reagent as a chemical test:

Magnesium chloride and magnesium nitrate solution.

EASY

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

When treated with conc.

HCl, {MnO}_{2}

yields gas

(X)

which further reacts with

Ca {(OH)}_{2}

to generate a white solid

(Y)

reacts with dil.

HCl

to produce the same gas

X .

the solid

Y

EASY

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

A sample of potassium salt was contaminated with potassium chloride. The tests were carried out on the contaminated sample.

TEST: An equal volume of barium nitrate solution is added to a solution of the solid. A precipitate forms which will disappear if dilute nitric acid is added. Why?

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

Saturated solution of

{SO}_{2}

is heated at

150 ° C

in a closed container. The product obtained is treated with

{BaCl}_{2}

solution. What is/are the most suitable observation(s)?

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

A sample of potassium salt was contaminated with potassium chloride. The tests were carried out on the contaminated sample.

TEST: An equal volume of barium nitrate solution is added to a solution of the solid. A precipitate forms. Name the precipitate and explain why it forms?

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

A sample of mineral water contained these ions:

Name of ion	Concentration(milligrams/ ${dm}^{3}$ )
calcium	55
chloride	37
hydrogen carbonate	248
magnesium	19
nitrate	0.05
potassium	1
sodium	24
sulphate	13

Which of the ions will react with barium nitrate solution to give a white precipitate?

Barium chloride salt solution used for testing sulphate radical.

Important Questions on Inorganic Qualitative Analysis

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