__________is a thick, black coloured liquid with an unpleasant odour.

Options

A. Coal tar
B. Coke
C. Coal gas
D. Peat

Answer

To answer the question "__________ is a thick, black coloured liquid with an unpleasant odour," we can follow these steps:

### Step 1: Identify the Characteristics
The question describes a substance that is:
- Thick
- Black in color
- Has an unpleasant odor

### Step 2: Consider Possible Substances
We need to think about substances that fit this description. The question hints at a type of coal or a byproduct of coal processing.

### Step 3: Analyze Types of Coal
There are several types of coal:
- Anthracite
- Bituminous
- Lignite
- Peat

However, these are solid forms of coal and do not match the description of a liquid.

### Step 4: Consider Byproducts of Coal
One byproduct of coal processing is coal tar, which is known to be:
- A thick, black liquid
- Has a strong, unpleasant odor

### Step 5: Conclusion
Based on the characteristics and analysis, the answer to the question is:
**Coal tar** is a thick, black coloured liquid with an unpleasant odour.

### Final Answer
**Coal tar**

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