Sec 4 Normal Science Chem TYS MCQ 2021 Set B
Quiz by HAO YI
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- Q1
Which mixture could be separated using paper chromatography?
sand and water
aqueous salt solution
blue and red food dyes
salt and sugar
60s - Q2
Substance X has the physical properties listed.
- low melting point
- non-conductor of electricity
- insoluble in water
What is substance X?
metal
ionic compound
covalent molecule
alloy
60s - Q3
In an atom there n neutrons, p protons and e electrons.
For this atom, how is the nucleon (mass) number defined?
n + p
p
n
n + p + e
60s - Q4
When hydrogen burns in air a colourless liquid, L, forms.
Which row describes hydrogen, air and liquid L?
A
B
C
D
60s - Q5
What is the amount, in moles, of CuO present in 20 g of pure CuO?
[relative atomic masses, Ar: Cu, 64; O, 16]
20
0.25
0.4
4
60s - Q6
Which equation, when completed, will show the production of a salt and hydrogen?
CuO(s) + H2SO4(aq)
CuCO3(s) +2HCl(aq)
Zn(s) + 2HCl(aq)
2NaOH(aq) + H2SO4(aq)
60s - 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 as it turns sour?
6.5 to 8.5
2.0 to 7.0
9.0 to 4.5
6.5 to 4.5
60s - Q8
What substance do farmers add to soil to increase the pH?
carbon dioxide
calcium hydroxide
nitric acid
sodium chloride
60s - Q9
The positions of four elements in the Periodic Table are shown.
The letters do not represent the chemical symbols of the elements.
Which letter represents an element with only one valency electron?
A
B
C
D
60s - Q10
The electronic structures of four elements are shown.
Which element is the least reactive?
2,8,7
2,8,8,2
2,8,8
2,8,4
60s - Q11
Some reactions of three metals, P, Q and R, are listed.
Which metals could be P, Q and R?
A
B
C
D
60s - Q12
The alloy brass is a mixture of the metals copper and zinc.
Which diagram could represent the alloy brass?
60s - Q13
One iron nail is placed in each of three test-tubes as shown. The test-tubes are left for 10 days.
After 10 days, in which test-tubes would the iron nail have rusted?
A
B
C
D
60s - Q14
Anhydrous calcium chloride is used as a drying agent.
An alkaline solution of pyrogallol absorbs oxygen and carbon dioxide.
Air is passed through the apparatus shown.
Which gases are present in the air leaving the apparatus?
A
B
C
D
60s - Q15
Naphtha is a mixture of hydrocarbons obtained from petroleum.
Which process is used to obtain naphtha?
filtration
displacement
fractional distillation
crystallisation
60s
