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.

Explain the chlorine water test for bromine. Cl 2 ( aq ) + 2 NaBr ( aq ) → 2 NaCl ( aq ) + Br 2 ( aq )

When chlorine (as a gas or dissolved in water) is added to sodium bromide solution, the chlorine takes the place of bromine. Because chlorine is more reactive than bromine, it displaces bromine from sodium bromide. The solution turns brown. This brown colour is displaced bromine. Cl 2 ( aq ) + 2 NaBr ( aq ) → 2 NaCl ( aq ) + Br 2 ( aq )

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Red fumes in the chromyl chloride test indicate the presence of bromide ions.

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Important Questions on Inorganic Qualitative Analysis

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Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Bromide 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 ________

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

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

Magnesium chloride and magnesium nitrate solution.

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

Which combines with

{Fe}^{2 +}

to form brown complex?

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Chemistry>Practical Chemistry>Inorganic Qualitative Analysis>Tests for Bromide 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 Bromide 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

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

All halogens respond to chromyl chloride test.

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

Copy and complete the equation below, including state symbols.

${AgNO}_{3} (aq) + NaBr (aq) \to$

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

A mixture on heating with conc.

H_{2} {SO}_{4}

and

{MnO}_{2}

liberates reddish brown vapours of

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

Describe the test of bromide 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 Bromide Ion

Represent the union of two sets by Venn diagram for each of the following.

$X = {x | x$ is a prime number between $80$ and $100}$

$Y = {y | y$ is an odd number between $90$ and $100}$

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

A colourless solution of a compound gives a precipitate with

{AgNO}_{3}

solution but no precipitate with a solution of

{Na}_{2} {CO}_{3} .

The action of concentrated

H_{2} {SO}_{4}

on the compound liberates a suffocating reddish brown gas. The compound is:

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

Explain the chlorine water test for bromine.

${Cl}_{2} (aq) + 2 NaBr (aq) \overset{}{\to} 2 NaCl (aq) + {Br}_{2} (aq)$

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

Explain silver nitrate test for bromide ions.

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

You suspect that a solid compound might be potassium bromide. Describe how you would test your idea. Then describe the positive results you would get if you were correct.

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

_____ salts do not form red fumes with acidified dichromate.

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

Which of the following will not produce a precipitate with

{AgNO}_{3}

solution?

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

Explain the test of bromide ion with acidic dichromate.

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

A unknown salt

(S)

when heated with dil.

H_{2} {SO}_{4}

does not evolve brown vapours but with conc.

H_{2} {SO}_{4}

brown vapours are obtained. The vapours when brought in contact with

{AgNO}_{3}

solution do not give any precipitate. The salt

(S)

contains:

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

_____ colour of the compound is obtained when sodium carbonate extract metal bromide carbon tetrachloride and chlorine water is shaken and allow to settle down.

Red fumes in the chromyl chloride test indicate the presence of bromide ions.

Important Questions on Inorganic Qualitative Analysis

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