Identify (A) to (D) in following steps and give chemical equations:
(a) A white amorphous powder (A) on strongly heating gives a colourless noncombustible gas (B) and solid (C).
(b) The gas (B) turns lime water milky and disappears with the passage of excess of gas.
(c) The solution of (C) in dilute HCI gives a white precipitate with an aqueous solution of KdFeCN).
(d). The solution of (A) gives white ppt. (D) on passing `H_(2)S` in presence of `NH_(4)`OH.

Explanation

To solve the problem step by step, we will identify the compounds (A) to (D) and provide the corresponding chemical equations.

### Step 1: Identify Compound (A)
The problem states that (A) is a white amorphous powder that, upon strong heating, produces a colorless non-combustible gas (B) and a solid (C).

**Identification:**
- The white amorphous powder (A) is **Zinc Carbonate (ZnCO₃)**.

...