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Science — Third Preparatory

Science — Third Preparatory

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Science — Third Preparatory 2026/2027

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Unit 1 - Force, Motion, Acceleration and Physical Quantities

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Quiz

Question bank: Unit 1 — Chemical Reactions and Their Environmental Impacts

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  • Questions count: 12
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1.
Which of the following is a sign that a chemical reaction has taken place?
A solid melts at its melting point
A precipitate forms when two solutions are mixed
Sugar dissolves in water
Water changes into ice
2.
Which element is NOT able to displace hydrogen from dilute hydrochloric acid?
Zinc
Iron
Magnesium
Silver
3.
Which list shows the metals in descending order of reactivity?
Cu > Zn > Mg
Mg > Zn > Cu
Zn > Mg > Cu
Mg > Cu > Zn
4.
The gas produced when zinc reacts with dilute hydrochloric acid burns with a "pop" sound. It is:
oxygen
hydrogen
chlorine
carbon dioxide
5.
Aluminium reacts slowly at first with dilute hydrochloric acid because:
it is below hydrogen in the series
its surface is covered by a layer of aluminium oxide
it does not form a salt
it is a non-metal
6.
Sodium is stored under kerosene because it:
is very dense
reacts with air and moisture
is a gas
is radioactive
7.
In 2Na + 2H₂O → 2NaOH + H₂, the solution formed turns red litmus:
red
blue
colourless
yellow
8.
Magnesium needs hot water to react while sodium reacts with cold water. This shows that:
magnesium is more reactive than sodium
sodium is more reactive than magnesium
both have equal reactivity
magnesium is inactive
9.
When a zinc rod is placed in copper sulphate solution, the blue colour fades because:
zinc sulphate is blue
copper ions are changed to copper atoms
zinc is reduced
water is decomposed
10.
Which reaction would NOT occur?
Mg + FeSO₄ → MgSO₄ + Fe
Zn + CuSO₄ → ZnSO₄ + Cu
Cu + ZnSO₄ → CuSO₄ + Zn
Fe + CuSO₄ → FeSO₄ + Cu
11.
Aluminium foil cleans tarnished silver because aluminium:
is below silver in the series
is more reactive than silver
has a higher density
is a non-conductor
12.
Wet paper catches fire more slowly than dry paper because water:
adds oxygen
absorbs heat and delays reaching the ignition point
lowers the ignition point
is a fuel
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