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NECO Chemistry Practical 2022 Question Paper
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An effervescence occurs in which a colorless and odourless gas which burns blue litmus red is evolved.
CO² gas from CO3^²is suspected
The gas turns lime water milky.
CO² gas is confirmed.
Y dissolves completely in water
White gelatinous PPT is formed.
Al³+, Zn²+, Pb²+, present
The white gelatinous PPT dissolve in excess NaOH
Al³+, Zn²+, Pb²+, present
White gelatinous PPT formed.
Al³+, Zn²+, Pb²+, present
The white gelatinous PPT remain insoluble in excess NH³
Al³+, Pb²+, present.
It increases the boiling point of water
It requires heat to occur.
This is because it is deliquescent.
I. Calcium oxide
II. Anhydrous copper(ii) tetraoxosulphate(vi)
I. To separate a mixture of immiscible liquids
II. To collect gases.
The volume or pipette used 25.00cm³I Ina tabular formT Titrations|rough |1st|2nd|3rd|F inal reading |21.00|41.30|20.40|40.90I Initialreading|0.00|21.00|0.00|20.40V Volof A used |21.00|20.30|20.40|20.50
Averagevolume of A = 20.30+20.40+20.50/3
H2X(aq) + 2NaOH(aq)–>Na2X(aq) + 2H2O(l)
Mass conc. of B = 1g/250cm³
= 1g/0.25dm³ = 4g/dm³
Molar conc. = mass conc./molar mass
= 4/(23+16+1) = 4/40 = 0.1mol/dm³
Using CAVA/CBVB = nA/nB
CA = CBVBnA/VAnB
CA = 0.1×25×1/20.4×2
Concentration of A = 0.06127mol/dm³
Molar mass of A = mass conc/molar conc
(i)it might contain traces of impurities which must be removed before being weighed
(ii)it is hygroscopic which readily absorb moisture from atmosphere
For question 1
Use your school’s endpoint and use it wherever you see our endpoint (13.20cm³) …and calculate with it.
Use the answer you got in 1b(i) to solve in 1b(ii) i.e we got 0.0396 in 1bi after calculating with our average titre (endpoint) value 0.0396, as u can see, we then used the 0.0396 in 1bii which we got from our calculation in 1bi.
*NB:* If you use our endpoint and your school teacher submits a different one with a wide margin to what u used, you will either fail or lose some mark in this particular question. Your school teacher should have in one way given you the average titre value(endpoint) or you might have gotten it in the lab from your past experiment.
If your school wants to use mine, then the chemistry teacher must submit endpoint similar to ours without much difference…eg 13.10, 13.20, 13.30, etc
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EXAMINATION SCHEME FOR NECO 2022 Chemistry Practical
If you’re wondering what the 2022 NECO Chemistry Practical question paper will look like, you can get the main gist/expo here as we reveal and explain everything without holding anything back.
The NECO Chemistry Practical QUESTIONS paper in 2022 will be divided into two sections: objective and theory. Here are some hints about the content of these TWO sections. Please keep in mind that all (two) sections must be completed on the SAME DAY and within a specific time frame. Join us as we dissect the two sections of the Biology Practical question paper for the year 2022.
2022 NECO Chemistry paper 1: keep in mind that you will have to answer at least 50 questions in the object (OBJ) section, each of which is worth one mark, for a total of 50 marks.
2022 NECO Chemistry paper 2: this is the theory section, where you will be required to answer only 5 questions out of a total of 11.
EXAMINATION INSTRUCTIONS FOR THE NECO 2022 Chemistry Practical EXAMINATION
- If you aren’t told to, don’t open your booklet.
- At the end of the exam, always write your name on the WAEC attendance sheet.
- When shading your objectives questions, only use HB pencil.
- Keep in mind that if you are caught with expo, your WAEC score may be withheld (it shall not be your portion amen)
- Your names must be spelled correctly, and you must include the subject and exam number.
- Chemistry Practical requires calculations, so you need to bring your calculator.
- Before submitting, go over what you’ve written so far to make sure it’s free of errors.
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