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Byju's Answer

Standard XII

Chemistry

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

An unknown in...

Question

An unknown inorganic compound $(X)$ gave the following reaction:
(i) on heating $^{'} X^{'}$ gave a residue, oxygen and oxide of nitrogen.
(ii) addition of acetic acid and $K_{2} C r_{2} O_{7}$ to its aqueous solution give a yellow precipitate.
(iii) addition of $N a O H$ to its aqueous solution first forms a white precipitate, Dissolve in the excess of the reagent.
Identify the compound $(X)$ :

X = P b (N O_{3})_{2}

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X = P b (N O_{3})

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X = P b (N O_{2})_{2}

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None of these

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Solution

The correct option is A $X = P b (N O_{3})_{2}$
Option (A) is correct.
(i) On heating $P b (N O_{3})_{2}$ gave a residue, oxygen and oxide of nitrogen.
$P b (N O_{3})_{2} ⟶ P b O + O_{2} + N O_{2}$
(ii) Addition of acetic acid and $K_{2} C r_{2} O_{7}$ to its aqueous solution give a yellow precipitate. $P b (N O_{3})_{2} + K 2 C r O 4 ⟶ P b C r O_{4} (y e l l o w p p t) + K N O_{3}$
(iii) Addition of $N a O H$ to its aqueous solution first forms a white precipitate,which dissolves in the excess of the reagent.
$P b (N O_{3})_{2} + N a O H ⟶ P b (O H)_{2} (w h i t e p p t) + N a N O_{3}$
$P b (O H)_{2} + N a O H ⟶ N a_{2} P b O_{4} (s o l u b l e c o m p l e x) + H_{2} O$

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Similar questions

Q. An unknown inorganic compound

(X)

gave the following reactions.
(i) the compound

(X)

on heating gave a residue, oxygen and oxide of nitrogen.
(ii) an aqueous solution of compound to tap water gave a turbidity which did not dissolve in

H N O_{3}

(iii) the turbidity dissolved in

N H_{4} O H

.
Identify the compound

(X)

Q. An aqueous solution of inorganic compound

(X)

gives the following reactions.

(i) with an aqueous solution of

B a C l_{2}

a precipitate insoluble in dilute

H C l

is obtained.
(ii) addition of an excess of

K I

gives a brown appearance that turns white on the addition of an excess of hypo.
(iii) with an aqueous solution of

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

a chocolate coloured precipitate is obtained.

Identify

(X)

An aqueous solution of an inorganic compound (X) gives the following reactions.

(i) With an aqueous solution of

B a C l_{2}

, a precipitate insoluble in dilute

H C l

is obtained.

(ii) Addition of excess of

K I

gives a brown precipitate which turns white on addition of excess hypo solution.

(iii) With an aqueous solution of potassium ferrocyanide a chocolate colored ppt. is obtained.

Identify X :

Q. The aqueous solution of inorganic compound

(X)

yielded a white precipitate when treated with dilute

H N O_{3}

and

A g N O_{3}

. Another sample of the solution of

(X)

when treated with

N a O H

gave a white precipitate first which dissolved in excess of

N a O H

yielding a colorless solution. When

H_{2} S

gas was passed through that solution a white precipitate was obtained.

Identify the compound

(X)

and give the reactions.

Q. The certain inorganic compound (X) shows the following reactions:

(i) On passing

H_{2} S

through an acidified solution of (X), a brown precipitate is obtained.
(ii) the precipitate obtained at step(i) dissolves in excess of yellow ammonium sulphide.
(iii) On adding an aqueous solution of

N a O H

to a solution of (X), first, a white precipitate is obtained which dissolves in excess of

N a O H

.
(iv) The aqueous solution of (X) reduces ferric chloride. (X) is

{S n C l}_{2}

If the given statement is true enter 1, else enter 0.

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