(c) The composition in wood and soil may not be the same throughout, only ice and air are homogeneous.
https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/
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Ice – Homogeneous (solid form of water, same composition throughout).
Air – Homogeneous (if pure and well-mixed, like clean air).
(i) Ice and (iv) Air are homogeneous in nature.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/