NECO GCE 2023 CHEMISTRY PRACTICAL QUESTIONS AND ANSWERS
Wednesday 22nd November 2023
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TEAM EXPOPIN
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Chemistry Paper I (Alternative to practical)
2:00 pm – 4:00pm
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TEAM EXPOPIN
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Take a look at the time we dropped in our vip group
NECO GCE 2023 CHEMISTRY PRACTICAL QUESTIONS AND ANSWERS BELOW
SOLUTIONS
NUMBER 2 SOLUTION
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3ai)
Hydrogen Sulphide
aii)
reaction with lead salts
aiii)
Pick any two
Oxygen
Carbon dioxide
Nitrogen
3bi)
-Melting Point Determination: This involves heating a small sample of the substance and measuring the temperature at which it melts.
-Chromatography: This technique separates the components of a mixture based on their different affinities for a stationary phase and a mobile phase.
bii)will observe a color change in the solution. The orange color of the potassium heptaoxochromate VI solution would turn green due to the reduction of the chromium(VI) ion to chromium(III) ion by the sulfur dioxide gas.
SO2 + K2Cr2O7 + H2SO4 → Cr2(SO4)3 + K2SO4 + H2O
biii)
a)It will turn RED litmus paper BLUE
b)t will turn BLUE litmus paper RED