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2021 N Level MCQ
Quiz by Shiyun Gina Lim
Tag the questions with any skills you have. Your dashboard will track each student's mastery of each skill.
Which mixture could be separated using paper chromatography?
Substance X has the physical properties listed.
- low melting point
- non-conductor of electricity
- insoluble in water
In an atom there are n neutrons, p protons and e electrons.
For this atom, how is the nucleon (mass) number defined?
When hydrogen burns in air a colourless liquid L, forms.
Which row describes hydrogen, air and Liquid L (in order)?
What is the amount, in moles, of CuO present in 20g of pure CuO?
[relative atomic masses, Ar : Cu, 64; O, 16]
Which equation, when completed, will show the production of a salt and hydrogen?
Milk is slightly acidic. When exposed to the air it turns 'sour' because bacteria produce more acids.
What is the change in pH of the milk when it turns sour?
Which substance do farmers add to soil to increase the pH?
Refer to the image for this question.
The electronic structures of four elements are shown.
Which element is the least reactive?
Refer to the image for the question.
The alloy brass is a mixture of the metals copper and zinc.
Which diagram could represent the alloy brass?
Refer to image for question.
What is added to the blast furnace to remove acidic impurities during the extraction of iron?
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Naphtha is a mixture of hydrocarbons obtained from petroleum.
Which process is used to obtain naphtha?
Which atmospheric pollutant is produced by lightning activity?
Which equation represents the combustion of an alkane?
Which row shows the general formula for alkenes and the effect of alkenes on aqueous bromine?
Refer to image for question.
