Arjun creates a tester circuit with an LED and dips its free ends into the beakers of different liquids.In which of these liquids will the LED glow?

Options

A. Distilled water
B. Tap water
C. Acetone
D. Spirit

Answer

To determine in which liquids the LED will glow when dipped into them, we need to understand the concept of electrolytes and how they conduct electricity. Here’s a step-by-step solution to the question:

### Step 1: Understanding the Circuit
Arjun has created a tester circuit with an LED. The LED will glow if there is a flow of electric current through it. For electric current to flow, there must be free-moving charged particles (ions) in the liquid.

**Hint:** Remember that electric current requires charged particles to flow.

### Step 2: Identifying the Liquids
The liquids mentioned are:
1. Distilled water
2. Tap water
3. Acetone
4. Spirit (alcohol)

**Hint:** Consider the properties of each liquid and whether they can produce free ions.

### Step 3: Analyzing Distilled Water
Distilled water is pure and does not contain any dissolved salts or minerals. Since there are no ions present, it cannot conduct electricity.

**Conclusion:** The LED will NOT glow in distilled water.

**Hint:** Pure substances without impurities generally do not conduct electricity.

### Step 4: Analyzing Tap Water
Tap water contains various dissolved minerals and salts, which can dissociate into ions. These free ions allow electricity to flow through the water.

**Conclusion:** The LED WILL glow in tap water.

**Hint:** Look for liquids that contain dissolved salts or minerals for conductivity.

### Step 5: Analyzing Acetone
Acetone is a non-polar solvent and does not contain free ions. Therefore, it cannot conduct electricity.

**Conclusion:** The LED will NOT glow in acetone.

**Hint:** Non-polar solvents typically do not conduct electricity.

### Step 6: Analyzing Spirit (Alcohol)
Spirit, like acetone, is also a non-electrolyte and does not produce free ions in solution. Hence, it cannot conduct electricity.

**Conclusion:** The LED will NOT glow in spirit.

**Hint:** Non-electrolytes do not dissociate into ions and cannot conduct electricity.

### Final Conclusion
The only liquid among the options that will cause the LED to glow is **tap water** because it contains free ions that can carry electric current.

**Final Answer:** The LED will glow in **tap water** only.