Which of the following characteristics is associated with red and yellow soils in India? 1. It develops on crystalline igneous rocks in areas of heavy rainfall. 2. It develops a reddish colour due to diffusion of iron in crystalline and metamorphic rocks. 3. It develops yellow colour in hydrated forms. 4. It develops red and yellow colour due to iron and sulphur in dry conditions. How many of the statements given above are correct?