NECO Chemistry Practical Questions and Answers | –Download PDF. The National Examination Council of Nigeria (NECO) Examination is around the corner. This article provides the readers with the information on how to download NECO Chemistry Practical Questions and Answers. NECO Mathematics Questions are essential for you to know if you want to pass the NECO SSCE Mathematics Exams 2023.
The NECO Chemistry Practical questions and answers is a compiled material in PDF that contains past questions from NECO Mathematics Exams of previous years. The material comes with answers and is easily downloadable.
You can download the materials here. The instructions on how to download the NECO Mathematics can be found below. You are expected to follow the instructions in order for you to succeed. The material does not only contain information on NECO Mathematics Questions and answers but how to pass exams as well. You can see this article on the 21 indispensable steps to pass any exams with high grade.
Download also: WAEC past Questions and Answers.
NECO Chemistry Practical Sample Questions and Answers 2023
NECO Practical Chemistry Answers 2023 Loading…
Today’s Chemistry Practical Answers:
Volume of pipette used=25cm3.
Indicator used= Methyl orange
Under Titration, Rough, 1st, 2nd, 3rd,
Final burette reading; |25.00| |23.40| |23.50| 23.60|
Initial burette reading; |0.00| |0.00| |0.00| |0.00|
Volume of A used; |25.00| |23.40| |23.50| |23.60|
Average volume of Acid used=23.40+23.50+23.60/3 =70.5/3=23.50cm3
This is because it is a reaction between a weak acid and strong base
A funnel should be used while transferring the acid into the burette.
Conc of A in mol|dm³ =?
Conc of A in g|dm³ = 12.75g|dm³
Molar mass of A, NaHSO⁴ = 23+1+32+64
Conc(mol/dm³) = conc(g/dm³)/molar mass
Con of B in mol/dm³ =?
Ca =0.106, Cb =? Va =23.50cm³, Vb =25.00cm³
na=1 , nb=1
Conc of B in g/dm³=?
Molar mass of B , NaOH=23+16+1=40g/mol
From; conc(g/dm³)=conc(mol/dm³)molar mass
Mass of salt formed =?
Recall mole of NaHSO⁴=?
From; mole =con(mol/dm³)*vol(cm³)/1000
Mole=0.0025mol of NaHSO⁴
By proportion 1mol of NaHSO⁴ produce 1mol of Na²SO⁴ 0.0025mol of NaHSO⁴ will produce X mol of Na²SO⁴ X=0.00251=0.0025mol of NaSO⁴
Molar mass of Na²SO⁴=(232) + 32 + (16*4)
Recall; mole =mole/molar mass
Mass =mole * molar mass
Mass =0.36g of Na²SO⁴
[PLEASE PUT IN A TABULAR FORM]
C + 5cm³ of distilled water
It dissolve completely
C is a soluble salt
Solution + NaOH + Heat
Effervescence occurs in which a colourless gas with pungent smell and turns red litmus paper to blue is given off.
NH³ gas from NH⁴+ is present
Stirring rod of HCL + gas given off
a gas which gives a pop sound is given off
H² is present
Solution C + drops of BaCL²
a white precipitate is formed
CO²^-3, SO²^-4, SO²^-3, May be present.
Solution in C(i) + dil HCL
the white precipitate dissolve is dil HCL and effervescence occurs in which a colourless and odourless gas which turns blue litmus red and lime water milky is given off
CO² gas from CO²^3- confirmed
concentrated acid can be defined as an acid formed when a large quantity of an acid dissolve in a small or little volume of water.
A strong acid is defined as a type of acid that ionize completely in a solution
Activated charcoal is used as an adsorbent material
(i)Reddish – Brown
(ii) I – red, II – brown.
NECO Chemistry Specimen 2023
CHEMISTRY PRACTICAL SPECIMEN:
(a) One burette (50cm³)
(b) One pippete (20cm³/25cm³). However, all
candidates in a center must use pipettes of the
(c) 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 paper
(d) Methyl orange
(e) One boiling tube
(f) Five test tubes
(g) Filtration apparatus
(h) Source of heat
Each candidate should be supplied with the
following: Labelled An, Bn, Cn, where ‘n’ is the
candidate’s serial number.
(a) 150cm³ of chloride acid solution in a bottle
labelled “An”. The acid solution which should
be the same for all candidates will contain
3.4cm³ of the concentrated hydrochloric acid
per dm³ solution.
(b) 150cm³ of sodium hydroxide solution in a
bottle labelled “Bn”. The solution which should
be the same for all candidates will contain
4.0g of sodium hydroxide per dm³ of solution.
(c) One spatulaful of copper (ii)
tetraoxosulphate (vi) salt in a specimen bottle
The questions below are strictly for practice not the 2023 Chemistry expo.
All your burette readings (initials and final) as well as the size of your pipette must be recorded but no account of experimented procedure is required. All calculations must be done in your booklet.
- A is O.200 moldm3 of HCI. C is a solution containing 14/3g of Na2CO3. x H2O in 500 cm3 of solution. (a) Put A into the burette and titrate it against 20.0 cm3 or 25.0 cm3 portions of C using methyl orange as indicator. Repeat the titration to obtain Consistent titre values. Tabulate your results and calculate the average volume of A used. The equation for the reaction is: Na2CO3 x H2O + 2HCL(aq) → 2NaCI(aq) + CO2(g) + (x+1) H2O(I).
(b) From your results and the information provided. Calculate the: (i) concentration of C in moldm-3; (ii) concentration of C in gdm-3; (iii) molar mass of Na2CO3, xH2O; (iv) the value of x in Na2CO3 xH2O. [H = 1.0; C=12.0; O = 16.0; Na =23.0]
Credit will be given for strict adherence to the instruction, for observations precisely recorded and for accurate inferences. All tests, observations and influences must be clearly entered in the booklet in ink at the same time they are made.
2. F is a mixture to two inorganic salts. Carry out the following exercise on F. record your observation and identify any gas(s) evolved. State the conclusions you draw from the result of each test. (a) Put all of F in a beaker and add about 10cm3 of distilled water. Stir well and filter. Keep the filtrate and the residue. (b)(i) To about 2cm3 of the filtrate, add NaOH(aq) in drops and then in excess (ii) To another 2cm3 portion of the solution, add a few drops of NHO3(aq)followed by few drops of AgNO3(aq). (d)(i) Put all the residue into a clean test-tube and add NHO3(aq) followed by few solution from 2(d)(i) add NaOH(aq) in drops and then in excess.
3. State what would be observed if the following reactions are carried out in the laboratory: (i) methyl orange is dropped into a solution of lime juice (ii) hydrogen sulphide gas is bubbled through iron (III) chloride solution; (iii) sulphur (IV) oxide gas is bubbled into acidified solution of KMnO4; (iv) ethanoic acid is added to a solution of K2CO3.
CHEMISTRY PRACTICALS ANSWERS
- Indicator = Methyl Orange
Volume of the base used = 25.00cm3
|Titration||Rough Titre||1st Titre||2nd Titre||3rd Titre|
|Final Burette readings cm3||24.70||24.80||24.70||24.90|
|Initial Burette reading cm3||0.00||0.00||0.00||0.00|
|Volume of acid used cm3||24.70||24.80||24.90||24.90|
Average Titre = 1st + 2nd + 3rd/3
= 24.80 + 24.70 + 24.90/3
Alternatively 2 concordant titres can be used to calculate average titre.
Equation of the reaction: Na2CO3 XH2O + 2HCI(aq) → 2NacI(aq) + CO2(aq) + (x+1)H2O(I)
CAVA/CBVB = nA/nB
CA = Molar concentration of HCI(aq) in moldm3
VA = Volume of acid used in cm3 = 24.80cm3
CB = Molar concentration of Na2Cu3 xH2O in moldm3
nA = 2
nB = 1
(b)(i) concentration of C in moldm-3 = ? From the equation of reaction:
CAVA/CBVB = nA/nB
CA = 0.200 moldm3 VA = 24.80cm3
CB = ? VB = 25.00cm3
Substitution of known values
0.200 x 24.80/ CB x 25.00 = 2/1
CB = 1×0.200×24.80/2×25.00
CB = 0.0992 moldm-3
(ii) Concentration of C in g dm-3 = ?
500cm2 → 14.3 g
1000cm3 →14.3/ 500 x 10002 g
= 28.6 g dm-3
(iii) Molar mass of Na2CO3 xH2O
Molar conc in moldm-3 = conc in g dm-3 / molar mass
Therefore: Molar mass g mol-1 = conc in g dm-3 / molar conc in moldm-3
= 28.6 g dm-3/0.0992 moldm-3
Approximately 288 g mol-1
(iv) Value of x in Na2CO3 xH2O?
[H = 1.0, C = 12.0, O = 16.0, Na = 23.0]
Na2CO3 xH2O = 288
2(23) + 12 + 3 (16) + x (2(I) + 16) = 288
46 + 12 + 48 + 18x = 288
106 + 18x = 288
18x = 288
18x = 182
x = 182/18
x = 10.11
x approximately 10
|(a)||F + distil water + stir + filter||Effervescence (bubbling) occurs, colourless and odourless gas evolved after filtration pale blue/colourless filtrate and green residue|
|(b)(i)||Filtrate + NaOH(aq) in drops then in excess||White precipitate formed Precipitate insoluble in excess NaOH(aq)||Ca2+/Pb2+ Ca2+ present|
|(b)(ii)||Filtrate + NH3(aq) in drops then in excess||No visible reaction No visible reaction OR||Ca2+ present Ca2+ confirmed|
|(b)(i)||Filtrate + NaOH(aq) in drops then in excess||Blue gelatinous precipitate formed Precipitate insoluble in excess||Cu2+ is present|
|(b)(ii)||Filtrate + NH3(aq) in drops then in excess||Pale (light) blue gelatinous precipitate formed Precipitate dissolves to form a deep blue solution||Cu2+ Cu2+ is confirmed|
|(c)||Filtrate + NHO3(aq) + AgNO3(aq)||No visible reaction No gas involved White precipitate formed||CuI- is present|
|(d)(i)||Residue + HNO3(aq)||Efferveness occurs, colourless and odourless gas evolves that turn blue litmus paper to red and turns lime water milky||CO2(g) CO32- present|
|(d)(ii)||Solution from 2(d)(i) + NaOH(aq) in drops then in excess||Blue precipitate formed Precipitate insoluble in excess NaOH(aq)||Cu2+ Cu2+ present|
3 (a)(i) Solution of lime juice turns to pink or red. (ii) The FeCI3 solution changes colour from brown to green and a yellow deposit. (iii) The purple colour of the KMnO4 solution turns colourless or decolourised. (iv) The solution of K2CO3 reacts with the addition of ethanoic acid to evolve a colourless, odourless gas with bubbling of effervescence.
How to Download NECO Chemistry Practical Questions and Answers
Here are the instructions to be followed in order to download the NECO Mathematics Questions and answers without any issue. Please follow our instructions and guide very well.
The cost of the newly updated NECO Past Questions and Answers is 2,000.00 naira only for One Subject e.g
- Use of English 1000 naira
- Biology 1000 naira
- Chemistry 1000 naira
- Physics 1000 naira
See The Payment Detail Below.
To get NECO Past Questions and Answers follow the steps below.
Pay into the account below.
Account Name: ETUK, OTO-OBONG EMMANUEL
Account Number: 0318379097
After Payment , send the following
(1) Depositors name,
(2) Teller number,
(3) Amount paid to 07063986527 on whatsapp or email@example.com
The purchased NECO Past Questions and Answer will be uploaded immediately into your email address within the next 24 hours.
If you have purchased yours, kindly drop a testimony in the comment box below.
CALL or WhatsApp EXAMSTUTS: 07063986527
Send all your mails to firstname.lastname@example.org
Download also: The complete NECO Past Questions and answers for all subjects.
Tips on How to Pass NECO Examination 2023
If you want to Past the NECO Examination this year, you will need to follow the instructions below.
- Practice daily with NECO Past Questions and Answers
- Write out your subjects, the dates and time.
- Engage in general revision few days to the examination and dwell more on the subjects you find difficult.
- Focus on only your first paper a week to the exam. This would make it sweet and you will have energy to read for other papers.
- Don’t read any other subject when it is two days to a particular subject.
- When you have two papers that are separated by only one day, read the second one first before going to the subject you have first.
- Ensure to be in the NECO examination venue at least two hours to the examination so that you would be balanced.
- Try to be up to date in cases of changes in the timetable.
- Have a personal copy of the NECO timetable and syllabus.
- Go through your timetable daily so that you don’t miss any paper.
- Don’t go to the hall when you are not having paper that day.
Disclaimer: Please note these are not the actual questions and answers that you will find in the NECO Examination this year, but they are the likely questions. to get the actual NECO Past Questions and answers, please call 07063986527.
If this article on NECO Mathematics Questions and Answers has been helpful Please share and Like us on Facebook@Examstuts
If You Want More Information, please subscribe to our email list and leave a comment with your number below, also Follow us on Facebook, Twitter, and Linkedin
For Inquiries on all Past Questions Call 07063986527 or Chat on WhatsApp.
Disclaimer: Please note that we are not in any way affiliated with any of the organizations or institutions here. All articles here are for the sole purpose of providing information. All Past questions are gotten from previous years’ examinations and likely questions from the Internet and related exams. We are not in any way promising that what you find in the past questions is what you will find in your examination. We are not in any way responsible for how the reader uses the information here. Please do consult an expert or professional in your field should the need arise.
Copyrights Infringement: No article from this website should be copied without a proper reference and link to the page picked from. Anything otherwise will lead to legal action of copyright infringement. All articles on this website are products of painstaking research from our writers and journalist. Should you find any material bearing semblance here to any material on your page, please quickly notify us by sending a mail to email@example.com and we will immediately commence the process of taking it down.