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Chemical Properties of Glucose

A black colou...

Question

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 $(C)$ gives a white turbidity $(D)$ . Gas $(B)$ when passed in an acidified solution of a compound $(E)$ gives a precipitate $(F)$ soluble in dil. $H N O_{3}$ . After boiling this solution when an excess of $N H_{4} O H$ is added, a blue coloured compound $(G)$ is formed. To this solution on addition of acetic acid and aqueous $K_{4} [F e (C N)_{6}]$ a chocolate precipitate $(H)$ is obtained. On addition of an aqueous soluion of $B a C l_{2}$ to an aqueous solution of $(E)$ , a white precipitate insoluble in $H N O_{3}$ is obtained. Identify $(G)$ and $(H)$ .

(G) - [C u (N H_{3})_{4} (N O_{3})_{2}

(H) - C u_{2} [F e (C N)_{6}]

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(G) - [C u (N H_{3})_{3} (N O_{3})_{2}

(H) - C u_{2} [F e (C N)_{6}]

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(G) - [C u (N H_{3})_{4} (N O_{3})_{2}

(H) - C u [F e (C N)_{6}]

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(G) - [C u (N H_{3})_{4} (N O_{3})

(H) - C u_{2} [F e (C N)_{6}]

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Solution

The correct option is A $(G) - [C u (N H_{3})_{4} (N O_{3})_{2}$ $(H) - C u_{2} [F e (C N)_{6}]$
Option (A) is correct. The sequence of the formed compounds are : $(A) - F e S$ $(B) - H_{2} S$ $(C) - H N O_{3}$ $(D) - S$ $(E) - C u S O_{4}$ $(F) - C u S$ $(G) - [C u (N H_{3})_{4} (N O_{3})_{2}$ $(H) - C u_{2} [F e (C N)_{6}]$
$F e S$ + $H_{2} S O_{4}$ $\to$ $F e_{2} O_{3}$ + $H_{2} S$
$H_{2} S$ + $H N O_{3}$ $\to$ $H_{2} O$ + $N_{2}$ + $S$
$H_{2} S$ + $C u S O_{4}$ $\to$ $C u S$ + $H_{2} S O_{4}$
$C u S$ + $N H_{4} O H$ $\to$ $[C u (N H_{3})_{4} (N O_{3})_{2}$
$[C u (N H_{3})_{4} (N O_{3})_{2}$ + $C H_{3} C O O H$ + $K_{4} [F e (C N)_{6}]$ $\to$ $C u_{2} [F e (C N)_{6}]$
$C u S O_{4}$ + $B a C l_{2}$ $\to$ $B a S O_{4}$ + $C u C l_{2}$

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Similar questions

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

H N O_{3}

is obtained.

Identify B.

Q. In qualitative analysis when

H_{2} S

is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil.

H N O_{3}

it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives._____.

Q. A certain metal

(A)

is boiled in dilute

H N O_{3}

to give a salt

(B)

and an oxide of nitrogen

(C)

. An aqueous solution of

(B)

with brine gives a precipitate

(D)

which is soluble in

N H_{4} O H

. On adding aqueous solution of

(B)

to hypo solution, a white precipitate

(E)

is obtained.

(E)

turns black on standing.

Identify

(D)

and

(E)

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)

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).

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