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.

Match List I with List II. List-I (Anion) List-II (gas evolved on reaction with dil. H 2 SO 4 ) (A) CO 3 2 - (I) Colourless gas which turns lead acetate paper black. (B) S 2 - (II) Colourless gas which turns acidified potassium dichromate solution green. (C) SO 3 2 - (III) Brown fumes which turns acidified KI solution containing starch blue. (D) NO 2 - (IV) Colourless gas evolved with brisk effervescence, which turns lime water milky. Choose the correct answer from the options given below

A - IV , B - I , C - II , D - III

A - III , B - I , C - II , D - IV

A - II , B - I , C - IV , D - III

A - IV , B - I , C - III , D - II

EASY

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The gas evolved by the reaction of carbonate radicals with dilute sulphuric acid is:

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Important Questions on Practical Chemistry

MEDIUM

Science>Chemistry>Practical Chemistry>Identification of Ions

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

Science>Chemistry>Practical Chemistry>Identification of Ions

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

MEDIUM

Science>Chemistry>Practical Chemistry>Identification of Ions

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 ________

MEDIUM

Science>Chemistry>Practical Chemistry>Identification of Ions

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.

HARD

Science>Chemistry>Practical Chemistry>Identification of Ions

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

Magnesium chloride and magnesium nitrate solution.

EASY

Science>Chemistry>Practical Chemistry>Identification of Ions

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

Science>Chemistry>Practical Chemistry>Identification of Ions

Which combines with

{Fe}^{2 +}

to form brown complex?

MEDIUM

Science>Chemistry>Practical Chemistry>Identification of Ions

Match List I with List II.

	List-I (Anion)		List-II (gas evolved on reaction with dil. $H_{2} {SO}_{4}$ )
(A)	${CO}_{3}^{2 -}$	(I)	Colourless gas which turns lead acetate paper black.
(B)	$S^{2 -}$	(II)	Colourless gas which turns acidified potassium dichromate solution green.
(C)	${SO}_{3}^{2 -}$	(III)	Brown fumes which turns acidified KI solution containing starch blue.
(D)	${NO}_{2}^{-}$	(IV)	Colourless gas evolved with brisk effervescence, which turns lime water milky.

Choose the correct answer from the options given below

MEDIUM

Science>Chemistry>Practical Chemistry>Identification of Ions

[X] + H₂SO₄ → [Y] a colourless gas with an irritating smell

$[Y] + K_{2} {C r}_{2} O_{7} + H_{2} {S O}_{4} \to g r e e n s o l u t i o n$

$[X]$ and $[Y]$ are, respectively -

MEDIUM

Science>Chemistry>Practical Chemistry>Identification of Ions

Soda extract is prepared by

EASY

Science>Chemistry>Practical Chemistry>Identification of Ions

Sulphur dioxide gas is evolved by the reaction of sulphide radicals with dilute sulphuric acid.

EASY

Science>Chemistry>Practical Chemistry>Identification of Ions

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

MEDIUM

Science>Chemistry>Practical Chemistry>Identification of Ions

A substance on treatment with dil.

H_{2} {SO}_{4}

liberates a colourless gas which produces
(i) Turbidity with baryta water and (ii) turns acidified dichromate solution green.
The reaction indicates the presence of

EASY

Science>Chemistry>Practical Chemistry>Identification of Ions

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

EASY

Science>Chemistry>Practical Chemistry>Identification of Ions

Water-soluble mixture

\to_{(ii) Filter}^{(i) {BaCl}_{2}}

white ppt.

Filtrate + (hot and conc.) HNO₃ + BaCl₂

\to

white ppt. So, the mixture contains

HARD

Science>Chemistry>Practical Chemistry>Identification of Ions

Aqueous solution of KI is used to detect:

MEDIUM

Science>Chemistry>Practical Chemistry>Identification of Ions

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 $100}$

HARD

Science>Chemistry>Practical Chemistry>Identification of Ions

A solution of a metal ion, when treated with KI, gives a red precipitate which dissolves in an excess of KI to give a colourless solution. Moreover, the solution of the metal ion on treatment with a solution of cobalt(II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ions is :

HARD

Science>Chemistry>Practical Chemistry>Identification of Ions

Which of the following mixtures of ions can be separated by using an excess of an NaOH solution ?

EASY

Science>Chemistry>Practical Chemistry>Identification of Ions

Which of the following anions would decolourise acidified

K M n O_{4}

solution

The gas evolved by the reaction of carbonate radicals with dilute sulphuric acid is:

Important Questions on Practical Chemistry

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