Question 1 of 6Chromatography
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The diagram shows a chromatogram of the dyes present in five different inks.
An investigation to identify the ink used to make a fake one hundred dollar note using paper chromatography was carried out. The chromatogram shown was obtained.
Which of the following Period 3 oxides is amphoteric, reacting with both acids and bases?
A student added black copper(II) oxide powder to nitric acid, forming a blue solution P containing copper(II) ions. Which other substance is present in solution P?
Write a balanced chemical equation, with state symbols, for the reaction between zinc granules and copper(II) sulfate solution.
In the Contact process for manufacturing sulfuric acid, Fig.5's flow diagram shows sulfur and dry air entering box A; the process proceeds A -> B -> C, with oxygen also fed into C; C -> D, with water entering D and concentrated sulfuric acid leaving D; D -> E, with waste gases leaving E. In which box is sulfur dioxide oxidised to sulfur trioxide (the catalytic converter)?
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