Chemistry Mcq 2015

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Need an explanation for the question no.13
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If you have any doubts regarding this answer ,please inform me.

Pasindu to find the reacted O2 moles why are we diving it by 2

Pasindu Sir meka sameekaranaya thulithakarala hadanna berida?

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Is it ok now?

Sir meka sameekaranaya thulithakarala hadanna berida?