Neco Gce 2017 Chemistry Obj And Essay Solution Answer – Nov/Dec Expo

NECO GCE Chemistry Obj And Essay/Theory Solution Questions and Answer – NOV/DEC 2017 Expo Runz.

Chem-Obj
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No.3d added

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4a)
(i) Coke
(ii) Graphite
(iii) Diamond
(iv) Coal
(v) Charcoal
(4b)
Le chatelier’s principle states that for a reversible reaction in equilibrium, if any of the factors(temperature, concentration, pressure) keeping the system in equilibrium is altered, the system will shift to adjust the change
(4bii)
I – It will shift from left to right
II – It will shift from left to right
III – It will favor the forward reaction by increasing the product
(4biii)
Kc = [NH]2
——
[N2][H2]3

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3ai)
petroleum gas and petrol->kerosene->diesel->asphalt
3aii)
I-asphalt
II-kerosene
III-petroleum gas and petrol
IV-asphalt
3bi)
i)ethene
ii)propene
3bii)
i)structural isomerism
ii)steveo isomerism
3biii)
19R-1s^2 2s^2 2P^6 3S^2 3P^6 4S^1
10S-1S^2 2S^2 2P^6
24T-1S^2 2S^2 2P^6 3S^2 3P^6 4S^2 3D^4
3biv)
group 6
3ci)
I- AgNO3(aq) and BaCl2
II-BaCl2 and Na2SO4
III-Ca(NO3)2 and H2CO3(aq)
3cii)
i)fitteration
ii)flocculation
iii)disinfection

3d)
Mass of NaCl
= mass of Nacl + mass of H2O
= (23 + 35.5) + 80g
= 58.5 + 80g = 138.5g
Hence
Since 39.8g at 100°C = 35.9g at 15°C
138.5g at 100°C = Xg at 15°C
X = 138.5 × 35.9/39.8g
= 124.9g at 15°C
Hence mass of Nacl precipitated
= 138.5 – 124.9g
= 13.6g of Nacl

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5a)
i) increasing the surface area
By adding catalyst to the reaction
ii)0.896dm^3 of CO2 was produced by 4g of caco3
iii)
If 100g of caco3-----1mole of co2(22.4dm3)
4g------X
X=4*22.4/100
X=0.896dm3

5bi)
i)atom the smallest particle of a chemical element that can exist.
ii)molecule is a group of atoms bonded
together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

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2a)
i)Temporary hardness is caused by dissolved calcium hydrogencarbonate 
ii)Permanent hardness is caused by dissolved calcium sulfate.

2bi) 
i)Temporary Hardness can be Removed By Boiling
ii)Permanent hardness can be removed by ... washing soda (sodium carbonate); ion exchange; the use of polyphosphate water softeners.
2bii) 
Advantages
i)Calcium ions in the water are good for children's teeth and bones. 
ii)Some brewers prefer using hard water for making beer.
2biii) 
Disadvantages
i)It is more difficult to form a lather with soap.
ii)Scum may form in a reaction with soap, wasting the soap.

2ci)
A saturated solution is a chemical solution containing the maximum concentration of a solute dissolved in the solvent.
2ciii) 
- Anthracite Coal
- Bituminous coal
- Sub-bituminous coal
2civ) 
The anthracite coal: They are the purest forms of coal

2d) 
- Zinc is not a transition metal because it forms only Zn2+ ions with all the 3d electrons present.
- Zn not a transition metal, because it forms only Sc3+ ions with n d-electrons
2dii) 
Fine Chemicals: This is a chemical compound made in relatively small amounts and in a comparatively pure state.

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