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NECO GCE 2022 Chemistry Practical Questions and Answers 2022 ( Legit Expo)

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*NECO 2022 CHEMISTRY PRACTICAL SPECIMEN*

_INSTRUCTION(S) TO SCHOOL_

Great care should be taken to ensure that the information given below does not reach the candidates either directly or indirectly before the examination.
In addition to the apparatus and reagents expected to be available in a Secondary School Chemistry Laboratory, each candidates will require the following;

(a) One Burette (50cm3).
(b) One Pipette (20cm3/25cm3), however all candidates in a centre must use pipette of the same volume.
(c) The usual apparatus and reagents for qualitative work including;

(i) Dilute Sodium Hydroxide Solution.
(ii) Dilute Ammonia Solution.
(iii) Dilute Hydrochloric Acid.
(iv) Distilled Water.
(v) Red and Blue Litmus Paper.
(vi) Barium Chloride Solution.
(vii) Phenolphthalein.
(viii) Calcium Hydroxide Solution.
(ix) Methyl Orange.
(x) One Boiling Tube.
(xi) Five Test Tubes.
(xii) Filtration Apparatus.
(xiii) Source of Heat.

3. Each candidates should be supplied with the following labeled An, Bn, Xn and Yn; where ‘n’ is the candidate’s serial number.

(a) 150cm3 of trioxonitrate(v)acid solution in a bottle labelled “An”. The acid solution which should be the same for all candidates will contain 9.50cm3 of concentrated trioxonitrate(v)acid per dm3 of solution.
(b) 150cm3 of sodium(iv) solution in a bottle lableled “Bn”. The solution which should be the same for all candidates will contain 4.20g of sodium trioxocabonate(iv) per dm3 of the solution.
(c) One Spatulaful of Zinc(II)trioxocabonate(iv) salt in a specimen bottle labelled “Xn”.
(d) One Spatulaful of Aluminium chloride salt in a specimen bottle labelled “Yn”.

4. In all cases, more materials may be given if required.

5. The actual concentrations of An and Bn must be stated by the Subject Teacher’s report form, while the candidates should make use of the concentrations stated in the question paper.

*===========================*

*Meaning of Titre value*
°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°
IN titration, the titer value is the ratio of actual to nominal concentration of a titrant, e.g a titer of 0.5 would require 1/0.5 = 2 times more titrant than nominal. This is to compensate for possible degradation of the titrant solution. Remember that your Practical section take 35% of the mark, Practical is the most crucial aspect you will have to pass to reach a better attainments in your Neco chemistry practical. Anyone who fails chemistry practical, will definitely fail chemistry. Practical aspect carries the half of the whole mark’s altogether.

NOTE : that you will have to use your school Titre value during titration today and substitute for the values in each equation using your calculator.*
*Remember that each schools has different Titre values, so before going to chemistry laboratory, remember to ask your chemistry teacher for your school Titre value.*
*All you have to do is to substitute, what I mean in essence is where ever you see the value sent to your just add your school Titre value there and start solving it using your calculator, the one sent to your will be a guide.*

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2022 neco chemistry practical questions and answers

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2022 Neco chemistry practical Answers (Legit answers )

 

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Typed Solutions  below 

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CHEMISTRY- PRACTICAL-ANSWERS+ExamEmpireS.com

(1)
Tabulate
Titration; | rough | 1 | 2 | 3 |

Final; | 20.50 | 14.00 |14.00 | 14.00 |

Initial; | 0.00 | 0.00 | 0.00 | 0.00 |

Volume of A used; | 20.50 | 14.00 |14.00 | 14.00 |

Volume of pipette used
=25.00cm³

(1a)
Average volume of A used = 14.00+14.00+14.00/3
=14.00cm³ (Va)

2HNO³ + X²CO³ —> 2XNO³ + H²O + CO²

(1bi)
Conc – of B in molldm³ = ?
Given;
Ca= 0.15molldm³
Vb= 25.00cm³
Va= 14.00cm³
Cb= ??
Na= 2
Nb= 1

Using;
CaVa/CbVb=Na/Nb
Cb= CaVaNb/VbNa
Cb= 0.15*14.00*1/25.00*2
Cb= 2.1/50
Cb= 0.042molldm³.

(1bii)
Molar mass of B =?
Using;
Conc(molldm³)= Conc(gldm³)/molar mass
0.042/1 * 4.20/m.m
m.m=4.20/0.042
m.m=100glmol

(1biii)
Value of x in x²(i)³=?
(2x)+12 + (16*3)= 100
2x+12+48=100
2x+60=100
2x=100-60=40
2x/2=40/2
x=20g/mol

(1ci)
(i)I ensure that the readings are taken at the lower meniscus
(ii)I ensure that my saliva did not enter the pipette while taking the base

(1cii)
Pink
==============================

(2)
Tabulate

(2ai)
Under Observation;
An effervescence occurs in which a colorless and odourless gas which burns blue litmus red is evolved.

Under Inference;
CO² gas from CO3^²is suspected

(2aii)
Under Observation;
The gas turns lime water milky.

Under Inference;
CO² gas is confirmed.

(2b)
Under Observation;
Y dissolves completely in water

Under Inference;
Soluble salt

(2bi)
Under Observation;
White gelatinous PPT is formed.

Under Inference;
Al³+, Zn²+, Pb²+, present

(2bii)
Under Observation;
The white gelatinous PPT dissolve in excess NaOH

Under Inference;
Al³+, Zn²+, Pb²+, present

(2biii)
Under Observation;
White gelatinous PPT formed.

Under Inference;
Al³+, Zn²+, Pb²+, present

(2biv)
Under Observation;
The white gelatinous PPT remain insoluble in excess NH³

Under Inference;
Al³+, Pb²+, present.
==============================

(3ai)
It increases the boiling point of water

(3aii)
It requires heat to occur.

(3bi)
This is because it is deliquescent.

(3bii)
I. Calcium oxide
II. Anhydrous copper(ii) tetraoxosulphate(vi)

(3ci)
Hydrogen Chloride

(3cii)
I. To separate a mixture of immiscible liquids
II. To collect gases.
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Completed!.

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