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Neco Chemistry Practical 2022 Answers for 2022 Exam

Chemistry Practical 2022 Answers for 2022 Exam.

Chemistry Practical Answers 2022: here are the verified Neco 2022 Chemistry Practical questions and answers for SS3 students for Wednesday 20th July 2022. Neco 2022 Chemistry Practical Questions and Answers.

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Neco Chemistry Practical Answers 2022 for 20th July 2022 with questions 100% verified official questions and answers for senior secondary schools.

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Neco Chemistry Practical 2022 Answers for 2022 Exam

Neco Chemistry Practical 2022 Answers for 2022 Exam

Wednesday 20th July 2022

  • Paper I: Practical – Chemistry – 10:00am – 12:45pm

Neco 2022 Chemistry Practical Questions and Answers

Chemistry Practical Answers
(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.
°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°

(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.
°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°

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Neco Chemistry Practical 2022 Answers for 2022 Exam

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Neco Chemistry Specimen 2022

 

Neco Mathematics 2022 Answers for 2022 Exam

Neco Chemistry Practical Specimen 2022

INSTRUCTION(S) TO

  • 1. Great care should be taken to ensure that the information given below does not reach the candidates either directly or indirectly before the examination.
  • 2. In addition to the apparatus and reagents expected to be available in a Secondary Chemistry Laboratory, each candidate will require the following;
    • (a) One Burette (50cm3).
    • (b) One Pipette (20cm3/25cm3), however, all candidates in a centre must use a pipette of the same volume.
    • (c) The usual apparatus and reagents for qualitative work include;
(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.
Neco Chemistry Specimen 2022
  • 3. Each candidate should be supplied with the following labelled 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 labelled “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.

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Neco Chemistry Practical 2022 Answers for 2022 Exam

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