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Different Chemical Properties of HCl

Solution of X...

Question

Solution of (X) in dil. $H C l + H_{2} O ⟶$ white turbidity. $(X) H_{2} S / H C l - ------ \to$ black ppt (Y).
(Y) is soluble in

A

H_{2} {S O}_{4}

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B

K N O_{3}

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C

{H N O}_{3}

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D

H C l

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Solution

The correct option is C ${H N O}_{3}$
The compund X is silver nitrate. It reacts with dil HCl to form a white turbidity of AgCl.
Silver nitrate reacts with hydrogen sulphide in presence of dil HCl to form black ppt of silver sulphid which is soluble in nitric acid.
$A g N O_{3} + H C l \to A g C l + H N O_{3}$

$2 A g N O_{3} + H_{2} S d i l H C l - --- \to A g_{2} S ↓ + 2 H N O_{3}$

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(X)

d i l . H C l + H_{2} O \to W h i t e t u r b i d i t y (X) H_{2} S / H C l - ----- \to B r o w n p p t . (Y)

(X)

Q. Hydrated salt (A) +

B a C l_{2} ⟶

white ppt (B) insoluble in

H N O_{3}

(A) (in dil..HCl) +

H_{2} S ⟶

black ppt soluble in 50%

H N O_{3}

N H_{3}

⟶

deep blue solution (C)
(A) +microscomic salt

△ \to

green (D) when hot
(A) +Kl solution

⟶

reddish brown changing to white ppt after hypo is added.
2.495 g of (A) gave 2.33 g of (B). Here (A) is identified as

C u S O_{4} . 5 H_{2} O

.
If true enter 1, else enter 0.

H_{2} S

gas is passed into a mixture solution acidified with dil

H C l

, yellowish turbidity appears, explain.

Q. Assertion :Sometimes it happens that when

H_{2} S

gas is passed into solutions in .dil. HCl, yellowish white turbidity appears. Reason: The yellowish turbidity is due to colloidal sulphur, formed by oxidation of

H_{2} S

by the presence of

N O_{3}^{-}

N O_{2}^{-} o r S O_{3}^{2 -}

H_{2} S + H N O_{3} ⟶ S

(colloidal)
Before passing

H_{2} S

gas, solution is boiled so as to decompose these radicals.

Read the above assertion and reason and choose the correct option regarding it.

In qualitative inorganic analysis of basic radicals, solution is prepared in dil.

H C l

and then diluted with

H_{2} O

H_{2} S

gas is passed. Orange turbidity appeared in one case on dilution. Turbidity dissolves when we add

H C l

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