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i) Soda water is a mixture of carbon dioxide and water. Soda water tastes the same throughout and the components cannot be told apart. This implies that soda water is a homogeneous mixture.
ii) Air is a mixture of various gases like nitrogen, oxygen, carbon dioxide, and many more. Air has a uniform composition of these gases throughout, and the constituent gases cannot be readily differentiated from one another. Hence air is a homogeneous mixture.
iii) Fruit salad is a mixture of various fruits. The pieces of fruits can be easily differentiated, which means that fruit salad is a heterogeneous mixture.