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Vant Hoff's Equation and Effect of Temperature on Equilibrium Constant

An aqueous so...

Question

An aqueous solution of a gas $(X)$ gives the following reactions:
(i) It decolourises an acidified $K_{2} C r_{2} O_{7}$ solution.
(ii) On boiling with $H_{2} O_{2}$ and cooling it and then adding an aqueous solution of $B a C l_{2}$ , a ppt. insoluble in dilute $H C l$ , is produced.
(iii) On passing $H_{2} S$ in the solution, white turbidity is formed.
Identify $(X)$ .

S O_{2}

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S O_{3}

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H_{2} S O_{4}

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H_{2} S O_{3}

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Solution

The correct option is A $S O_{2}$
The gas $X$ is sulphur dioxide $S O_{2}$ .
It decolourizes acidified potassium dichromate solution. Sulphur dioxide is oxidized to sulphuric acid. Potassium dichromate is reduced to chromic sulphate. Orange colour of solution turns green.
$3 S O_{2} + K_{2} C r_{2} O_{7} + H_{2} S O_{4} \to K_{2} S O_{4} + C r_{2} (S O_{4})_{3} + H_{2} O$
When sulphur dioxide is boiled with hydrogen peroxide and cooled, sulphuric acid is obtained.
$S O_{2} + H_{2} O_{2} \to H_{2} S O_{4}$
When barium chloride is added to sulphuric acid, a white ppt of barium sulphate is obtained which is insoluble in dil $H C l$ .
$H_{2} S O_{4} + B a C l_{2} \to B a S O_{4} + 2 H C l$
On passing $H_{2} S$ in the solution, white turbidity is formed due to formation of $S$ .
$2 H_{2} S + S O_{2} \to 2 H_{2} O + 3 S ↓$

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Similar questions

Q. An aqueous solution of a gas

(X)

gives the following reactions :
(i) It turns an acidified

K_{2} C r_{2} O_{7}

solution green.
(ii) On boiling it with

H_{2} O_{2}

, cooling it and then adding an aqueous solution of

B a C l_{2}

, a precipitate insoluble in dilute hydrochloric acid is obtained.
(iii) On passing

H_{2} S

in the solution a white turbidity is obtained.
Identify (X).

A black colored compound (A) on reaction with dilute

H_{2} S O_{4}

gives a gas (B) which on passing in a solution of acid (C) gives white turbidity (D). Gas (B) when placed in an acidified solution of a compound (E) gives a precipitate (F) soluble in dilute

H N O_{3} .

After boiling this solution, when an excess of

N H_{4} O H

is added, blue colored compound (G) is formed. To this solution on addition of

C H_{3} C O O H

and aqueous

K_{4} [F e (C N)_{6}]

, a chocolate precipitate (H) is obtained. On the addition of an aqueous solution of

B a C l_{2}

to an aqueous solution of E, a white ppt insoluble in

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is obtained.

Identify B.

Q. A black coloured compound

(A)

on reaction with dilute

H_{2} S O_{4}

gives a gas

(B)

which on passing in a solution of an acid

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gives a white turbidity

(D)

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when passed in an acidified solution of a compound

(E)

gives a precipitate

(F)

soluble in dil.

H N O_{3}

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N H_{4} O H

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K_{4} [F e (C N)_{6}]

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H N O_{3}

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Q. An unknown inorganic compound

(X)

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(i) it gives a white turbidity with dilute

H C l

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K I

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(iii) it gives a white precipitate with

A g N O_{3}

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Q. The aqueous solution of an unknown sodium salt gives the following reactions:
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H C l

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