Select the incorrect statements among the following:
(i) Coal mainly consists of carbon, hydrogen, oxygen and small amounts of nitrogen and sulphur are also present.
(ii) Petroleum and natural gas were formed from dead plants that got buried inside the earth.
(iii) Many useful substances of commercial importance are obtained from coal so it is also called as 'Black gold'.
(iv) Energy of fossil fuels is indirectly derived from the sun

Options

A. (i) and (ii) only
B. (ii) and (iii) only
C. (ii) and (iv) only
D. (i), (ii) and (iv) only

Explanation

To solve the question, we need to evaluate each of the statements provided and identify which ones are incorrect. Let's analyze each statement step by step.

### Step 1: Analyze Statement (i)
**Statement (i):** Coal mainly consists of carbon, hydrogen, oxygen, and small amounts of nitrogen and sulphur are also present.

- **Analysis:** This statement is generally correct. Coal is primarily composed of carbon, along with hydrogen, oxygen, nitrogen, and sulfur in smaller amounts. Therefore, this statement is **correct**.

### Step 2: Analyze Statement (ii)
**Statement (ii):** Petroleum and natural gas were formed from dead plants that got buried inside the earth.

- **Analysis:** This statement is incorrect. Petroleum and natural gas are primarily formed from the remains of dead marine organisms (like zooplankton and phytoplankton), not from dead plants. Thus, this statement is **incorrect**.

### Step 3: Analyze Statement (iii)
**Statement (iii):** Many useful substances of commercial importance are obtained from coal so it is also called 'Black gold'.

- **Analysis:** This statement is incorrect. While coal does yield many useful substances, the term 'Black gold' is commonly used to refer to petroleum, not coal. Therefore, this statement is **incorrect**.

### Step 4: Analyze Statement (iv)
**Statement (iv):** Energy of fossil fuels is indirectly derived from the sun.

- **Analysis:** This statement is correct. The energy stored in fossil fuels comes from the sun, as it was originally captured by plants through photosynthesis. Thus, this statement is **correct**.

### Conclusion
After analyzing all the statements, we find that the incorrect statements are:
- Statement (ii): Incorrect because petroleum and natural gas are formed from dead marine organisms, not plants.
- Statement (iii): Incorrect because 'Black gold' refers to petroleum, not coal.

### Final Answer
The incorrect statements are (ii) and (iii).

---