Statement-1: Pure NaCl is a diliquescent crystalline solid.
Statement-2: `Na_(2)CO_(3)` is known as pearl ash.
Statement-3: Sulphur disproportionates in NaOH.

Options

A. FFT
B. TTF
C. TFT
D. FFF

Answer

To analyze the statements provided in the question, we will evaluate each statement one by one and determine whether they are true or false.

### Step 1: Evaluate Statement 1
**Statement 1:** Pure NaCl is a deliquescent crystalline solid.

- **Definition of Deliquescent:** A substance is considered deliquescent if it can absorb moisture from the air and dissolve in it, forming a solution.
- **Analysis of NaCl:** Pure NaCl (sodium chloride) is commonly known as table salt. While it can absorb moisture under certain conditions (high humidity), it is not classified as a deliquescent substance in its pure form. Deliquescent substances typically are those that readily absorb water and dissolve, such as calcium chloride or magnesium chloride.
- **Conclusion:** Therefore, **Statement 1 is false.**

### Step 2: Evaluate Statement 2
**Statement 2:** Na₂CO₃ is known as pearl ash.

- **Correct Identification:** Na₂CO₃ is sodium carbonate, while K₂CO₃ is potassium carbonate, which is known as pearl ash. Pearl ash is derived from the ashes of burnt plants that contain potassium carbonate.
- **Conclusion:** Thus, **Statement 2 is false.**

### Step 3: Evaluate Statement 3
**Statement 3:** Sulphur disproportionates in NaOH.

- **Disproportionation Reaction:** A disproportionation reaction is a type of redox reaction where a single substance is both oxidized and reduced.
- **Reaction Analysis:** The reaction can be represented as:
\[ S + 2NaOH \rightarrow Na₂S + Na₂SO₃ + S \]
In this reaction, the oxidation states of sulphur change:
- In elemental sulphur (S), the oxidation state is 0.
- In sodium sulfide (Na₂S), the oxidation state of sulphur is -2.
- In sodium sulfite (Na₂SO₃), the oxidation state of sulphur is +4.
- **Conclusion:** Since sulphur goes from an oxidation state of 0 to -2 (reduction) and +4 (oxidation), it indicates that sulphur is undergoing disproportionation. Therefore, **Statement 3 is true.**

### Final Summary of Statements
- **Statement 1:** False
- **Statement 2:** False
- **Statement 3:** True

Thus, the overall evaluation of the statements is: **False, False, True (FFT)**.