1) Which of the following is a pure substance a) Wood b) Milk c) Sulphuric acid d) Lemonade 2) Heterogeneous mixtures have a) Uniform composition b) Non-uniform composition c) Both (a) & (b) d) None of these 3) Which of these is a physical change a) Melting of ice cream b) Preparing sugar syrup c) Flying a kite d) Baking a cake

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