05 May O Level | IP Chemistry Tuition Question
17 Acidified potassium dichromate(VI) can be used to detect the presence of ethanol vapour in the breath of a person who has consumed an ethanol-containing drink.
A colour change from orange to green is observed if ethanol is present.
This shows that ethanol is
A an alkali.
B an indicator.
C an oxidising agent.
D a reducing agent.
18 Which substance does not produce copper(II) sulfate when added to dilute sulphuric acid?
B copper(II) carbonate
C copper(II) hydroxide
D copper(II) oxide
19 The positions of four elements are shown on the outline of part of the Periodic Table.
Element X has a high melting point and is a good conductor of electricity.
It forms chlorides XCl2 and XCl3.
Which element is X?
20 In which compound does the element X have the highest oxidation state?
A X2O B X4O
C XO2 D XO4
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