The element A burns in nitrogen to give an ionic compound B. the compound B reacts with water to give C and D. A solution of C becomes milkly on bubbling carbon dioxide. What is the natrue of compound (D)?

Options

A. Acidic
B. Basic
C. Amphoteric
D. Neutral

Explanation

To solve the problem step by step, we need to analyze the information provided in the question and the video transcript.

### Step 1: Identify Element A
The question states that element A burns in nitrogen to form an ionic compound B. Based on common knowledge, calcium (Ca) is a metal that can burn in nitrogen to form calcium nitride (Ca3N2).

**Hint:** Think about metals that react with nitrogen to form stable ionic compounds.

### Step 2: Determine Compound B
When calcium burns in nitrogen, it produces calcium nitride (Ca3N2), which is an ionic compound. Therefore, we can identify compound B as calcium nitride.

**Hint:** Ionic compounds are typically formed between metals and nonmetals.

### Step 3: Reaction of Compound B with Water
Next, we need to consider what happens when compound B (calcium nitride) reacts with water. The hydrolysis of calcium nitride can be represented as:
\[ \text{Ca}_3\text{N}_2 + 6\text{H}_2\text{O} \rightarrow 3\text{Ca(OH)}_2 + 2\text{NH}_3 \]
This reaction produces calcium hydroxide (C) and ammonia (D).

**Hint:** Hydrolysis reactions often produce hydroxides and gases, especially with ionic compounds.

### Step 4: Identify Compounds C and D
From the hydrolysis, we have:
- C = Calcium hydroxide (Ca(OH)2)
- D = Ammonia (NH3)

**Hint:** Look for common products of metal hydroxides and gases when ionic compounds react with water.

### Step 5: Analyze the Behavior of Compound C
The question states that a solution of C (calcium hydroxide) becomes milky upon bubbling carbon dioxide. This is characteristic of the formation of calcium carbonate (CaCO3), which is insoluble in water and causes the solution to appear milky.

**Hint:** Consider how carbon dioxide interacts with metal hydroxides.

### Step 6: Determine the Nature of Compound D
Finally, we need to determine the nature of compound D (ammonia). Ammonia (NH3) is known to be a basic compound because it can accept protons (H+) and has a lone pair of electrons that can be donated.

**Hint:** Basicity is often associated with the ability to accept protons or donate lone pairs.

### Conclusion
The nature of compound D (ammonia) is basic.

### Summary of Steps:
1. Identify element A as calcium.
2. Determine compound B as calcium nitride (Ca3N2).
3. Understand that B reacts with water to produce C (calcium hydroxide) and D (ammonia).
4. Recognize that C becomes milky with CO2 due to the formation of calcium carbonate.
5. Conclude that D (ammonia) is basic in nature.

### Final Answer
The nature of compound D is basic (ammonia, NH3).