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My chemistry teacher said that the ratio proportion method is not so advisory to use in the O level examination because it is not allowed,:mad: rather we should use the unitary method IN stoichiometry questions. Is that true? because another chemistry teacher of mine told me that it was allowed...

so i'm new here and i want some answers for the following questions quickly! Q- Why is language important in the development of a nation? (4 marks) Q-Explain how Urdu developed as a language up to the beginning of the twentieth century?(4 marks) Q-Why does the Indian subcontinent have many...