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.

Statement I : Borax bead test is not suitable for Al(III). Statement II : Al 2 O 3 is insoluble in water.

Statement I is true, Statement II is also true and Statement II is not a correct explanation of Statement I.

Statement I is true, Statement II is also true and Statement II is a correct explanation of Statement I.

Statement I is true, Statement II is false.

Statement I is false, Statement II is true.

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The substance x belonging to IA group gives a pale violet colour in flame test, $x$ is

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Important Questions on Theoretical Principles of Experimental Chemistry

HARD

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

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

Magnesium chloride and magnesium nitrate solution.

MEDIUM

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

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.

MEDIUM

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

State one relevant observation for of the following:

Anhydrous calcium chloride is exposed to air for some time.

MEDIUM

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

The green colour produced in the borax bead test of a chromium(III) salt is due to -

EASY

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

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

MEDIUM

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

Which combines with

{Fe}^{2 +}

to form brown complex?

MEDIUM

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

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

MEDIUM

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

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 ________

EASY

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

Match List-I with List-II and select the correct answer using the codes given below.

	List I		List II
A.	Rinmann's green	1.	$Cu {({CH}_{3} COO)}_{2} \cdot Cu {(OH)}_{2}$
B.	Verdigris	2.	${HgCl}_{2}$
C.	Corrosive sublimate	3.	${CoZnO}_{2}$
D.	Lithopone	4.	$ZnS + {BaSO}_{4}$

EASY

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

The hottest region of Bunsen flame shown in the figure below is:

Question Image

MEDIUM

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

The dark red colour of bombs in fireworks is due to the presence of

EASY

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

When the salt

(X)

is heated in a dry test tube sublimation yields a solid substance in the upper, colder parts of the test tube. The deposit is yellow in colour. Therefore salt

(X)

contain

MEDIUM

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

Which of the following salt gives white precipitate with

A g N O_{3}

solution and dil.

H_{2} S O_{4}

solution and gives green flame test

EASY

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

A salt gives bright red colour to the flame. This colour indicates the presence of

MEDIUM

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

When a substance 'A' reacts with water, it produces a combustible gas 'B' and a solution of substance 'C' in water. While another substance 'D' reacts with solution of 'C' to produce the same gas B on warming while 'D' can produce gas 'B' on reaction with dilute

H_{2} S O_{4}

at room temperature. 'A' imparts a deep golden - yellow colour to a smokeless flame on Bunsen burner. Identify 'A', 'B', 'C' and 'D' respectively are

MEDIUM

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

On mixing two colourless gases, a deep brown colour is observed. The gases are

HARD

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

{AgNO}_{3} \overset{Δ}{⟶} (W) + (X) + O_{2}

(X) + H_{2} O ⟶ {HNO}_{2} + {HNO}_{3}

(W) + {HNO}_{3} ⟶ Y + NO + H_{2} O

(Y) + {Na}_{2} S_{2} O_{3} (excess) ⟶ (Z) + {NaNO}_{3}

Identify (W) to (Z) :

MEDIUM

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

A pale yellow precipitate and a gas with pungent odour are formed on warming dilute hydrochloric acid with an aqueous solution containing :

HARD

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

Statement I : Borax bead test is not suitable for Al(III).

Statement II : Al₂O₃ is insoluble in water.

MEDIUM

Chemistry>Inorganic Chemistry>Theoretical Principles of Experimental Chemistry>Preliminary Test for Radicals

Which of the following sulphate is insoluble in water

The substance x belonging to IA group gives a pale violet colour in flame test, x is

Important Questions on Theoretical Principles of Experimental Chemistry

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The substance x belonging to IA group gives a pale violet colour in flame test, $x$ is