9th Chemistry - Online MCQs - Past Year Paper 2017

Past Year Paper Online MCQs [Chemistry 2017] Class 9th

Chemistry Past Year Paper Online MCQs from Year : 2017 (Science Group Karachi Board) for class 9th

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jQuizMe

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Oxygen was discovered by:

1. J. Priestly
2. Cavendish
3. Scheele
4. J. Black

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