Answer
1. A mixture is homogeneous if the composition is uniform throughout. To add on, a mixture is homogeneous if the components in it completely mix with each other and its components are not visible in a way that it can be told apart.
2. (f) Here Carbon dioxide is the only pure substance.
3. a and e are homogeneous mixtures.
Work Step by Step
Carbon dioxide is a pure substance because it contains carbon and oxygen in a fixed ratio, i.e , 1:2. Pure substances have fixed composition. If the salt is dissolved completely in water and if we take a drop from any part of it, properties of it will not change. But we can take water and salt in any ratio.Thus it is a homogeneous mixture. Gasoline is a mixture of many compounds, particularly hydrocarbons, though composition is uniform throughout. Rest of the options ( b,c,d and g) are heterogeneous mixtures.
