Which of the following is/are the characteristic/characteristics of Indian coal? 1. High ash content 2. Low sulphur content 3. Low ash fusion temperature Select the correct answer using the codes given below.

1. Indian coal, particularly the Gondwana coal which constitutes the vast majority of India's reserves, has distinct characteristics. 2. Statement 1 is correct. Indian coal is generally known for its high ash content, often ranging from 35% to 50% or even higher. This high inorganic residue impacts boiler efficiency and leads to environmental issues like fly ash disposal. 3. Statement 2 is correct. A positive characteristic of Indian coal is its typically low sulphur content, usually less than 0.5%. This is environmentally advantageous as it reduces the emission of sulphur dioxide (a major contributor to acid rain) during combustion. 4. Statement 3 is incorrect. Indian coal generally has a high ash fusion temperature. A low ash fusion temperature would cause ash to melt and form clinkers in boilers easily, which is generally not the case with most Indian coals. 5. Therefore, the key characteristics of Indian coal are high ash content and low sulphur content.