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Byju's Answer

Standard XII

Chemistry

Catalytic Properties

Light blue co...

Question

Light blue coloured compound (A) on heating will convert into black coloured compound (B), which reacts with glucose and gives red compound (C). (A) reacts with ammonium hydroxide in excess of ammonium sulphate and gives blue compound (D). What is (A), (B), (C) and (D)?

[C u (N H_{3})_{4}] S O_{4}, C u O, C u_{2} O, C u S O_{4}

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C u S O_{4}, C u O, C u_{2} O, C u (O H)_{2}

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C u (O H)_{2}, C u_{2} O, C u O, [C u (N H_{3})_{4}] S O_{4}

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C u (O H)_{2} . C u O, C u_{2} O, [C u (N H_{3})_{4}] S O_{4}

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Solution

The correct option is D $C u (O H)_{2} . C u O, C u_{2} O, [C u (N H_{3})_{4}] S O_{4}$
Reactions:
$C u (O H)_{2} \to C u O r e d u c t i o n / g l u c o s e - ---------- \to C u_{2} O$

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Similar questions

Q. A mixture of

C u O

and

{C u}_{2} O

contains

88 %

C u

. The percentage of

C u O

in the mixture is (as nearest integer) :

Q. Which of the following statements is wrong about

C u S O_{4}

Q. An orange coloured solid

(A)

is soluble in water and gives a gas

(B)

and green coloured solid

(C)

on heating. The compound

(A)

gives a gas

(D)

when reacts with

N a O H

and solution turns yellow. The gas

(D)

turns red litmus blue. Identify the compounds

(A)

(D)

and explain the reaction.

Q. (a) Pyrolusite on heating with

K O H

in the presence of air gives a dark green compound (A). The solution of (A) on treatment with

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

gives a purple coloured compound (B), which gives following reactions:
(i)

K I

on reaction with alkaline solution of (B) changes into a compound (C).
(ii) The colour of the compound (B) disappears on treatment with the acidic solution of

{F e S O}_{4}

.
(iii) With conc.

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

compound (B) gives (D) which can decompose to yield (E) and oxygen. Identify (A) to (E) and write balanced chemical equations for the formation of (A) and (B) and for the steps (i) to (iii).
(b) Complete and balance the following chemical equations.
(i)

A u + H C l + {H N O}_{3} ⟶ . . . . . . . . + . . . . . . . . + H_{2} O

(ii)

C + {H N O}_{3} (c o n c .) ⟶ {C O}_{2} + . . . . . . . . + H_{2} O

(iii)

S n + K O H (h o t) + H_{2} O ⟶ . . . . . . . + . . . . . . .

(iv)

{C u (O H)}_{2} + {N H}_{4} {N O}_{3} + {N H}_{4} O H ⟶ . . . . . + H_{2} O

Q. An aromatic organic compound [A] on heating with

{N H}_{3}

and

{C u}_{2} O

at high pressure gives [B]. The compound [B] on treatment with ice cold solution of

{N a N O}_{2}

and

H C L

gives [C].Which on heating with

C u / H C l

gives compound [A] again. Identify the compounds [A], [B] and [C]. Write the name of the reaction for the conversion of [B] to [C] ?

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Light blue coloured compound (A) on heating will convert into black coloured compound (B), which reacts with glucose and gives red compound (C). (A) reacts with ammonium hydroxide in excess of ammonium sulphate and gives blue compound (D). What is (A), (B), (C) and (D)?

The correct option is D Cu(OH)2.CuO,Cu2O,[Cu(NH3)4]SO4Reactions:Cu(OH)2→CuOreduction/glucose−−−−−−−−−−−→Cu2O

The correct option is D $C u (O H)_{2} . C u O, C u_{2} O, [C u (N H_{3})_{4}] S O_{4}$
Reactions:
$C u (O H)_{2} \to C u O r e d u c t i o n / g l u c o s e - ---------- \to C u_{2} O$