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Preparations and Uses of Caustic Soda

An inorganic ...

Question

An inorganic compound (A) is a strong reducing agent. Its hydrolysis in water gives a white turbidity (B). An aqueous solution of, (A) gives a white precipitate (C) with $N a O H$ solution which is soluble in excess of $N a O H$ . (A) reduces auric chloride to produce purple of cassius, (A) also reduces iodine and gives chromyl chloride test. Find a total number of OH group present in one molecule of product C.

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Solution

$(A) = {S n C l}_{2}; (B) S n (O H) C l; (C) = {S n (O H)}_{2}$
${S n C l}_{2} (A) + H_{2} O \to S n (O H (B)) C l + H C l$
${S n C l}_{2} + N a O H \to {S n (O H (C))}_{2} + 2 N a C l$
${S n (O H)}_{2} + 2 N a O H \to {N a}_{2} {S n O}_{2} + 2 H_{2} O$
${3 S n C l}_{2} + 2 {A u C l}_{3} \to 3 {S n C l}_{4} + 2 A u$
${3 S n C l}_{2} + 2 H C l + I_{2} \to {S n C l}_{4} + 2 H I$
Thus, product C contain 2 $O H$ group.

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An inorganic compound (A) is a strong reducing agent. Its hydrolysis in water gives a white turbidity (B). Aqueous solution of (A) gives a white precipitate (C) with NaOH solution which is soluble in excess of NaOH. (A) reduces auric chloride to produce purple of cassius. (A) also reduces iodine and gives chromyl chloride test. What is 'B' in the chemical reactions.

An inorganic compound (A) is a strong reducing agent. Its hydrolysis in water gives a white turbidity (B). Aqueous solution of (A) gives a white precipitate (C) with NaOH solution which is soluble in excess of NaOH. (A) reduces auric chloride to produce purple of cassius. (A) also reduces iodine and gives chromyl chloride test. What is 'B' in the chemical reactions.

Q. An unknown inorganic compound

(X)

loses its water of crystallisation. On heating its aqueous solution gives the following reacion:
(i) it gives a white turbidity with dilute

H C l

solution.
(ii) it decolourises a solution of iodine in

K I

.
(iii) it gives a white precipitate with

A g N O_{3}

solution which turns black on standing.
Identify compound

(X)

?

Q. An inorganic compound

A

shows the following reaction:
(i) It is white solid, exists as dimer and fumes in the wet air.
(ii)It sublimes at

180^{\circ} C

and forms monomer if heated to

400^{\circ} C

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(iii) Its aqueous solution turns blue litmus to red and gives a white precipitate with

A g N O_{3}

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N H_{4} O H

N H_{4} O H

and NaOH separately to the solution of

A

gives a gelatinous precipitate which in however soluble in excess of

N a O H

A

A black colored compound (A) on reaction with

d i l . 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 passed in an acidified solution of a compound (E) gives a black precipitate (F) which is soluble in hot concentrated (C). After boiling this solution when an excess of ammonia solution is added, a blue-colored compound (G) is formed. To the solution of (E), on the addition of acetic acid and aqueous potassium ferrocyanide, a chocolate brown precipitate (H) is formed. On the addition of an aqueous solution of

B a C l_{2}

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H N O_{3}

The gas (B) on passing through an acid (C) gives white turbidity (D) because :

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