IGCSE Chemistry 0620/42/F/M/21 Q2

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Cher Questions Solution Bank Rumusan Jawapan SPM & IGCSE Questions Answers Solution

2 The elements shown are gases at room temperature and pressure.
hydrogen
nitrogen
oxygen
chlorine
(a) State which one of these gases is green.
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(b) The gases shown exist as diatomic molecules.
State the name of another element which has diatomic molecules and is a gas at room
temperature and pressure.
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(c) When separate samples of each of these gases are placed in a container they will diffuse.
(i) Describe why these gases diffuse.
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(ii) State which of these four gases has the highest rate of diffusion.
Explain your answer.
gas ……………………………………………………………………………………………………………………..
explanation ………………………………………………………………………………………………………….
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[2]

(d) Nitrogen, oxygen and other substances are found in clean, dry air.
(i) State the percentage of nitrogen in clean, dry air.
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(ii) Other than nitrogen and oxygen, identify another element found in clean, dry air.
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(iii) Identify a compound found in clean, dry air.
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(iv) Nitrogen and oxygen can be separated from liquid air.
State the name of this process.
……………………………………………………………………………………………………………………… [2]

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    2022-07-05T13:56:00+08:00

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