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Answer the following:
A teacher provides students with five unknown solutions labeled A, B, C, D, and E, which are actually lemon juice, baking soda solution, vinegar, sugar solution, and soap solution respectively. The students are instructed to identify the nature of each substance using safe and scientific methods. They are allowed to test the solutions using red and blue litmus paper, carefully observe the smell, and feel only those substances that are safe, such as soap solution. They are also encouraged to use their prior knowledge to make conclusions, but tasting of any substance is strictly prohibited to ensure safety in the laboratory.
1. Which substance contains methanoic acid?
2. Two samples show basic nature. Which pair is correct?
3. What is the best conclusion from this activity?
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