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(1 mark) 19. Refer to the handout Reference Absorption Spectra. Which gases produced this spectrum? A. hydrogen and boron B. hydrogen and helium C. magnesium

(1 mark) 19. Refer to the handout "Reference Absorption Spectra." Which gases produced this spectrum? A. hydrogen and boron B. hydrogen and helium C. magnesium and boron D. sodium and helium

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