Question

why some liquids are kept in dark coloured bottles

Answer 1

To prevent it from the effect of sunlight .
Eg: silver chloride on exposure to sunlight decomposes to silver and chlorine .
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Answer 2

so that the reaction doesn't take place in the presence of light. some reactions often take place in the presence of light. so to prevent it from happening the liquids are kept in dark coloured bottles .
hope the answer is correct and helps you.