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Zinc II Oxide

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Question

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.

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Solution

The white amorphous powder, compound (A) is zinc carbonate, $Z n C O_{3}$ .
The colourless non-conmbustible gas (B)is carbon dioxide, $C O_{2}$ .
The solid (C) obtained on strongly heating zinc carbonate is $Z n O$ .
The white precipitate (D) obtained by the reaction of zinc carbonate with hydrogen sulphide is $Z n S$ .
Zinc oxide reacts with dil HCl to form zinc chloride.
$Z n O + 2 H C l ⟶ Z n C l_{2} + H_{2} O$
Zinc chloride reacts with potassium ferrocyanide to form white precipitate of $Z n_{2} [F e (C N)_{6}]$ .
$2 Z n C l_{2} + K_{4} F e (C N)_{6} ⟶ Z n_{2} [F e (C N)_{6}] w h i t e ↓ + 4 K C l$

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