Plzz guys answer the 18th question
I have posted this question several times and even no one is answering it..
.so plzx guys i request you to answer it
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since i cannot answer i am answering in comments. see the answer can have a possibility of the B,because here the test tube is not having a cork. But in other reactions cork is used where mass is not changing but in B the mass is changing.
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I think A is correct as reaction cannot take place
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