Question

multiple-choice question why should you not return chemicals to the original bottle? they may be the wrong temperature now they might explode they might be contaminated rewatch submit

Explanation:

When handling chemicals, returning them to the original bottle can contaminate the stock. If chemicals are contaminated (e.g., mixed with other substances or impurities during use), putting them back would spoil the original reagent, affecting future experiments. The options about temperature or explosion are less related to the primary reason for not returning chemicals to the original bottle compared to contamination.

Answer:

They might be contaminated