Question in paper 1- 9701

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There is a question in Chemistry 9701 IN O/N 2018 Paper 12 Q 2, I did not understand the concept in this question, Why the answer should be B??
 
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There is a question in Chemistry 9701 IN O/N 2018 Paper 12 Q 2, I did not understand the concept in this question, Why the answer should be B??
i am not sure if i have covered the exact paper but i did a think aloud with lots of paper 1 mcq and other component/variants.

check out the p1 playlist on my channel, subscribe and share with friends and class chats if useful. Navigate to other useful playlists by topics too.

 
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