NECO Chemistry June/July solution papers is now available. If you are looking for verified free NECO Chemistry Practical Questions and Answers, here is the solution. All science students are expected to pass this section to get good grade. NECO (National Examinations Council) is a Nigerian examination body responsible for conducting the Senior Secondary Certificate Examination (SSCE) and other national educational assessments. It plays a crucial role in evaluating secondary school students’ academic achievements across Nigeria.
Chemistry practical exams involve conducting experiments to demonstrate understanding of theoretical concepts such as chemical reactions, titrations, and qualitative analysis.
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In this post, all details concerning NECO June/July Chemistry practical expo questions and answers is explained in detail. Adequate guide on how to pass the examination is also provided.
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The NECO exam on Thursday, July 4th, 2024, includes Paper I Practical for Chemistry, scheduled from 9:00 am to 12:00 noon.
This examination session is crucial for assessing students’ ability to apply theoretical knowledge in practical settings, focusing on experimental techniques and accurate data analysis.
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WAEC Chemistry Practical Answers
(1)
Tabulate;
Burette readings;
|Rough |1st |2nd|3rd|
Final readings in cm³;
|22.00|20.10 |20.20|20.30|
Initial reading in cm³;
|0.00|0.00|0.00 |0.00|
Volume of A (acid) used cm³;
|22.00|20.10|20.20| 20.30|
The average titre
= 20.10+20.20+20.30/3
=60.60/3
= 20.20cm³
;Va 20.20cm³
(1bi)
Concentration of A in mol/dm³, Ca = ?
Concentration of A (g/dm³) = 4.40g/dm³.
.m.m of A, H²SO⁴ =(1*2)+(32*1)+(16*4)
=2+32+64
=98g/mol
Using concentration (mol/dm³) = Concentration (g/dm³)/m.m
Concentration (mol/dm³)
=4.40/98
=0.045mol/dm³
;: Concentration of A(mol/dm³) = 0.045mol/dm³
(1bii)
Concentration of B(mol/dm³) =???
Ca=0.045, Va=20.20, Vb=25.00, na=1, nb=1, cb=?
Using; CaVa/CbVb = na/nb
Cb=CaVanb/Vbna =0.045*20.20*1/25.00*1
Cb=0.036mol/dm³
(1biii)
Conc. of B(g/dm³) that reacted =??
molar mass of B, Na₂CO₃ = (23*2)+(12*1)+(16*3) = 106g/mol
Conc. of B(mol/dm³) = 0.036mol/dm3
Conc. (mol/dm³) = Conc. (g/dm³)/molar mass
(0.036/1) = Conc. (g/dm³)/106
Conc. (g/dm³) = 0.036*106 = 3.82g/dm³
Conc. of B(g/dm³) = 3.82/dm³
(1biv)
mass of the impurity in 1.0dm³ of B=??
Conc. of impurity (g/dm³) = 7.50 – 3.82 = 3.68g/dm³
:. Mass of impurity= Conc. (g/dm³) x vol. (dm³)
= 3.68×1 = 3.68g
(1bv)
Vol. of CO₂ produced in 1.0dm³ of B = ??
Mole of B= Conc. x Vol. (dm³)
Mole of B = 0.036*1
Mole of B =0.036mol
By proportion,
1mol of Na₂.10₃ = 1mol of CO₂
0.036mol of Na₂.10₃ = xmol of CO₂
mole of CO₂ produced = 1*0.036 = 0.036mol
:. Volume = mole * 22.4 = 0.81dm³
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2024 Chemistry Specimens
- QUESTION 1–
T
Chemistry Laboratory, each candidate will require the following:(a) One burette (50 cm³)(b) One pipette (20 cm³ /25 cm³), however all candidates in a centre mustuse pipette of the same volume3. (a) The usual apparatus and reagents for qualitative work including:(i) Dilute sodium hydroxide solution(ii) Dilute ammonia solution(iii) Dilute hydrochloric acid(iv) Barium chloride solution(v) Distilled water(vi) Red and blue litmus papers(vii) Copper (II) tetraoxosulphate (VI) solution(viii) 2.0 molar solution of HCI–
Likely NECO SSCE Chemistry Practical exam Question
(a)i During the titration, why is the
(1) funnel removed from the burette before taking the
initial reading?
(II) burette first rinsed with distilled water before filling it
with acid?
(III) tip of the pipette dipped well below the surface of the alkali
before sucking up?
ii. Outline the procedure that can be used to obtain a pure sample of sodium
chloride from contaminated rock salt.
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