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NECO Chemistry Practical Specimen are all for Released all candidates consumption. Meanwhile, in subsequent time the answers will be dropped. Do well to note the NECO Chemistry Practical Specimen first while the exams starts all info will be laid down.

It is therefore important that you stay in touch for NECO 2021 Chemistry Practical Questions and Answers. Keep reading for juicy details.


NECO Chemistry Practical Specimen 2021


These are the recent 2021 NECO Chemistry Specimen;




NECO Chemistry Practical Questions and Answers (Updated)


Note that the above are the practical Specimen for NECO Chemistry Practical and not answers to any questions. Here is the answers while the exams will comense.

2021 NECO Chemistry Answers Updated



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

Conc =12.75/120

Conc =0.106mol/dm³


Con of B in mol/dm³ =?

Ca =0.106, Cb =? Va =23.50cm³, Vb =25.00cm³

na=1 , nb=1

From; CaVa/CbVb=na/nb






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 =0.0025*142

Mass =0.36g of Na²SO⁴




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.



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