05 May O Level | IP Chemistry Tuition
Are you able to answer this Secondary Chemistry Tuition Question? (Part 4)
21 Three elements X, Y and Z have consecutive, increasing proton numbers.
If element X is a noble gas, what will be the symbol for the ions of element Z in its compounds?
A Z2− B Z+
C Z2+ D Z3+
22 Iron is extracted in the blast furnace using the raw materials haematite, coke and limestone.
Which substance undergoes thermal decomposition?
B carbon dioxide
23 In which test-tube is the iron nail most likely to rust?
24 Which metal is used in the sacrificial protection of iron pipes?
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