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Course: Science — Third Preparatory
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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: 6
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1.
Which colour does universal indicator show at the neutralisation point?
Red
Violet
Green
Yellow
2.
NaOH + HCl → NaCl + H₂O is a:
single replacement reaction
neutralisation reaction
decomposition reaction
combination reaction
3.
When dilute hydrochloric acid is added to sodium carbonate, limewater turns milky because of:
hydrogen
oxygen
carbon dioxide
chlorine
4.
The white precipitate formed when silver nitrate solution is added to sodium chloride solution is:
NaNO₃
AgCl
AgNO₃
NaCl
5.
Sodium carbonate is added to hard water in order to:
remove calcium and magnesium ions as insoluble carbonates
add more calcium to the water
make the water acidic
kill bacteria
6.
The device in car exhaust that changes CO and NOₓ into CO₂ and N₂ is the:
acid-gas scrubber
catalytic converter
rheostat
carburettor only
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