2023 NECO Chemistry Essay Questions and Answers For all Candidates

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• NECO GCE Chemistry Questions Questions
• NECO Chemistry Questions Questions
• 2020/2021 NECO Chemistry Questions
• NECO Chemistry Questions
• GCE Chemistry Questions
• NECO Chemistry Questions
•  Chemistry Questions for GCE
• 2020 NECO Chemistry Questions
• 2022 Neco Chemistry Questions
• Neco Chemistry Questions 2022/2023

CHEMISTRY PAPER II
Paper 2 will last for 1 hour 30 min
Attempt two questions from this section

(1a)
Ammonium chloride —> sublimation
Ink —> chromatography
Iron filling —> magnetic separation

(1aii)
-Example Of physical Change
(i)change of matter
(ii)evaporation of sodium chloride

-Example of chemical change
(i)burning of firewood
(ii)rusting of iron

(1bi)
(i)they are good reducing agent
(ii)they form basic oxide
(iii)they formed electro valent bonding

(1bii)
Aluminum tetraoxosulphate(vi) is prepared by the action of hot concentrated tetraoxosulphate(vi)acid on aluminum oxide
Al2O3(s) + 3H2SO4(aq)—->Al2(SO4)3(aq)+3H2O(i)
Aluminum tetraoxosulphate(vi) is moderately soluble in water

(1ci)
Hydrogen

(1cii)
(i)it is denser than air
(ii)it is very poisonous

(1ciii)
Pb(NO3)2+H2S—->Pbs+2HNO3

(1civ)
It turn black due to the formation of black lead (II) sulphide

(1di)
Water gas contains flammable gases whereas the producer gas contains both flammable and non-flammable gases

(1dii)
(I) Diamond —> Octahedral in shape
(II) Graphite —> Hexagonal in shape

(1e)
(i) For manufacturing of ammonia and fertilizer
(ii) It is used as a refrigerant and also used to shrink metal parts
(iii) It is used in grinding substances that are too tough to grind at normal temperature

(2aii)
Avogadro’s law states that equal volumes of all gases under the same temperature and pressure contain the same number of molecules

(2aii)
Given : 2SO2(aq) + O2(g) –> 2SO3(aq)

The volume of oxygen, O2 required = 1/2*7.50dm³
=3.75dm³

No of moles required = 3.75/22.4moles
=0.1674moles

No of oxygen molecules required = 0.1674×6.02×10^23
=1.008×10^23molecules

(2bi)
(I) NaCl —–> Valency of chlorine is 1
(II) NaO2 —–> Valency of oxygen is 2
(III) Na3N ——> Valency of Nitrogen is 3

(2bii)
(i)Formation of black soap
(ii)Formation of glycerol
(iii)It helps in the precipitation of large biomolecules such as protein

(2ci)
(i)Na2O
(ii)MgO
(iii)CaO

(2cii)
Because they react with water to form acids

(2ciii)
– Reaction with sulphur
S(s) + O2(g) —> SO2(g)

– Reaction with metals
4Na(s) + O2(g) —-> 2NaO(s)

(2di)
Ion is any atom or group of atoms which possess an electric charge

(2dii)
TABULATE PLS
ION : H^+, F^-, N^3+

NUMBER OF PROTONS: 1,9,13

NUMBER OF NEUTRONS : 0, 10, 14

NUMBER OF ELECTRONS : 0, 10, 10

(2ei)
Monosaccharides are simple six-carbon sugar having the formula C6H12O6 eg glucose and its isomers are fructose and galactose, both obtainable from fruits and honey

(2eii)
(i)fructose
(ii)galactose

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