Which statements are true regarding methane? What does grey soil indicate?

Here are the answers to the questions:

1.1.4 The following statements are TRUE with regard to methane:

• (i) Is the simplest alkane and the main component of natural gas.
  • Methane ($\text{CH}_4$) is the simplest alkane. Natural gas is primarily composed of methane. This statement is TRUE.
• (ii) It produces $\text{O}_2$ and $\text{H}_2\text{O}$ when it burns in excess of $\text{CO}_2$.
  • When methane burns (combustion), it reacts with oxygen ($\text{O}_2$) to produce carbon dioxide ($\text{CO}_2$) and water ($\text{H}_2\text{O}$). It does not produce $\text{O}_2$. This statement is FALSE.
• (iii) It is used as a source of energy in rural homes.
  • Methane (as natural gas or biogas) is commonly used for cooking and heating in homes, including rural areas. This statement is TRUE.
• (iv) Has one carbon and four hydrogens.
  • The chemical formula for methane is $\text{CH}_4$, indicating one carbon atom and four hydrogen atoms. This statement is TRUE.

Statements (i), (iii), and (iv) are true.

The correct option is A.

1.1.5 The soil has an indication of the presence of salt.

• Grey soil is often associated with waterlogging and poor drainage. In arid and semi-arid regions, poor drainage can lead to the accumulation of salts on or near the soil surface, making grey soil an indicator of potential salinity.

The correct option is D.