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Types of Redox Reactions

A white amorp...

Question

A white amorphous powder (A) on heating yields a colourless, non combustible gas (B) and a solid (C). The later compound assumes a yellow colour on heating and changes to white on cooling. (C) dissolves in dilute acid and the resulting solution gives a white ppt. on adding K $_{4}$ [Fe(CN) $_{6}$ ] solution. (A) dissolves in dilute HCl with evolution of gas, which is identical in all respect to (B). The gas (B) turns lime water milky, but the milkiness disappears with the continuous passage of gas. The solution of (A) as obtained above gives a white precipitate (D) on the addition of excess NH $_{4}$ OH and passing H $_{2}$ S. Another portion of the solution initially gives a white precipitate (E) on the addition of NaOH solution, but dissolves on further addition of the base. Identify (A) to (E) :

(A) CuCO

_{3}

(B) CO

_{2}

_{2}

(E) : Na

_{2}

CuO

_{2}

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(A) CoCO

_{3}

(B) CO

_{2}

_{2}

(E) : Na

_{2}

CoO

_{2}

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(A) CaCO

_{3}

(B) CO

_{2}

_{2}

(E) : Na

_{2}

CaO

_{2}

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(A) ZnCO

_{3}

(B) CO

_{2}

_{2}

(E) : Na

_{2}

ZnO

_{2}

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Solution

The correct option is D (A) ZnCO $_{3}$ (B) CO $_{2}$ (C) ZnO (D) Zn(OH) $_{2}$ (E) : Na $_{2}$ ZnO $_{2}$

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Similar questions

Q. A white amorphous powder (A) when heated gives a colourless gas (B), which turns lime water milky and the residue (C) which is yellow when hot but white when cold. The residue (C) dissolves in dilute HCl and the resulting solution gives a white precipitate on addition of potassium ferrocyanide solution. (A) dissolves in dilute HCl with the evolution of a gas which is identical in all respects with (B). The solution of (A) as obtained above gives a white precipitate (D) on addition of excess of

N H_{4} O H

and on passing

H_{2} S

. Another portion of this solution gives initially a white precipitate (E) on addition of NaOH which dissolves in excess of it. Compounds (A) to (D) are identified as:
(A) :

Z n C O_{3}

, (B) :

C O_{2}

, (C) :

Z n O

, (D) :

Z n S

and (E) :

Z n (O H)_{2}

If true enter 1, else enter 0.

Q. Read the following statements:
(i) A white amorphous powder (A) on strongly heating gives a colourless non-combustile gas (B) and solid (C).
(ii) The gas (B) turns lime water milky and turbidity disappear with the passage of excess of gas.
(iii) The solution (C) in dilute HCl gives a white precipitate with an aqueous solution of

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

.
(iv) The solution of (A) gives a white precipitate (D) on pasiing

H_{2} S

in presence of excess of

N H_{4} O H

.
Compound (A) to (D) are identified as:
(A) :

Z n C O_{3}

(B) :

C O_{2}

, and (C) :

Z n O

, and (D) :

Z n S

If true enter 1, else enter 0.

Q. Identify A, B, C, D and choose the correct statement(s):

A + N_{2} △ - \to B H_{2} O - - \to C w h i t e p p t ↓ + D

White precipitate(C) dissolves in

N a O H

solution and the gas (D) gives white fumes with

H C l

Q. A solution when diluted with water and boiled, it gives a white precipitate. On addition of excess

N H_{4} C l / N H_{4} O H

, the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in

N H_{4} C l / N H_{4} O H

Light green (Compound 'A')

Δ - \to

White Residue (B)

H i g h - -- \to t e m p . C + D + E

(i) 'D' and 'E' are two acidic gas.

(ii) 'D' is passed through

H g {C l}_{2}

solution to give yellow ppt.

(iii) 'E' is passed through water first and then

H_{2} S

is passed, white turbidity is obtained.

(iv) A is water-soluble and addition of

H g {C l}_{2}

in it, white ppt is obtained but white ppt does not turn into grey on addition of excess solution of 'A'.

'D' and 'E' are respectively.

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The correct option is D (A) ZnCO3 (B) CO2(C) ZnO (D) Zn(OH)2 (E) : Na2ZnO2

The correct option is D (A) ZnCO $_{3}$ (B) CO $_{2}$ (C) ZnO (D) Zn(OH) $_{2}$ (E) : Na $_{2}$ ZnO $_{2}$