Which of the following represents the correct decreasing order of densities of the given liquids ?

Options

A. Lubricating oil `gt` Diesel oil `gt` Kerosene `gt` Petrol
B. Petrol `gt` Kerosene `gt` Diesel oil `gt` Lubricating oil
C. Kerosene `gt` Diesel oil `gt` Lubricating oil `gt` Petrol
D. Petrol `gt` Diesel oil `gt` Lubricating oil `gt` Kerosene

Answer

To determine the correct decreasing order of densities of the given liquids, we need to understand what density is and compare the densities of the specified liquids.

### Step-by-Step Solution:

1. **Understanding Density**:
- Density is defined as the mass of a substance per unit volume. It is usually expressed in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).

2. **List the Liquids**:
- The liquids mentioned in the question are:
- Lubricating Oil
- Diesel Oil
- Kerosene Oil
- Petrol (Gasoline)

3. **Compare Densities**:
- We need to compare the densities of these liquids based on known values:
- **Lubricating Oil**: Generally has a higher density compared to the others.
- **Diesel Oil**: Has a density that is higher than kerosene but lower than lubricating oil.
- **Kerosene Oil**: Has a density that is lower than diesel but higher than petrol.
- **Petrol (Gasoline)**: Has the lowest density among these liquids.

4. **Establish the Order**:
- Based on the comparisons, we can establish the following order of densities from highest to lowest:
- **Lubricating Oil** > **Diesel Oil** > **Kerosene Oil** > **Petrol**

5. **Final Answer**:
- The correct decreasing order of densities of the given liquids is:
- **Lubricating Oil > Diesel Oil > Kerosene Oil > Petrol**