2021 N Level MCQ
Quiz by Shiyun Gina Lim
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- Q1
Which mixture could be separated using paper chromatography?
salt and sugar
sand and water
blue and red food dyes
aqueous salt solution
30s - Q2
Substance X has the physical properties listed.
- low melting point
- non-conductor of electricity
- insoluble in water
metal
alloy
ionic compound
covalent molecule
30s - Q3
In an atom there are n neutrons, p protons and e electrons.
For this atom, how is the nucleon (mass) number defined?
p
n + p + e
n
n + p
30s - Q4
When hydrogen burns in air a colourless liquid L, forms.
Which row describes hydrogen, air and Liquid L (in order)?
element, mixture, compound
compound, element, mixture
compound, mixture, compound
element, compound, element
30s - Q5
What is the amount, in moles, of CuO present in 20g of pure CuO?
[relative atomic masses, Ar : Cu, 64; O, 16]
0.25
4
0.4
20
30s - Q6
Which equation, when completed, will show the production of a salt and hydrogen?
CuCO3 (s) + 2 HCl (aq) -->
2 NaOH (aq) + H2SO4(aq) -->
CuO (s) + H2SO4(aq) -->
Zn (s) + 2 HCl (aq) -->
30s - Q7
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?
6.5 to 4.5
2.0 to 7.0
6.5 to 8.5
9.0 to 4.5
30s - Q8
Which substance do farmers add to soil to increase the pH?
carbon dioxide
calcium hydroxide
nitric acid
sodium chloride
30s - Q9
Refer to the image for this question.
D
C
A
B
30s - Q10
The electronic structures of four elements are shown.
Which element is the least reactive?
2, 8, 8
2, 8, 7
2, 8, 4
2, 8, 8, 2
30s - Q11
Refer to the image for the question.
B
C
A
D
30s - Q12
The alloy brass is a mixture of the metals copper and zinc.
Which diagram could represent the alloy brass?
30s - Q13
Refer to image for question.
B
C
A
D
30s - Q14
What is added to the blast furnace to remove acidic impurities during the extraction of iron?
coke
slag
limestone
hot air
30s - Q15
Refer to image for question.
B
A
C
D
30s
