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NECO Chemistry Practical 2021 Answers & Specimen is Out

2021 NECO Chemistry Practical Questions and Answers is Out.

See Neco chemistry practical 2021 answers can be seen from this post. The National Examination Council (NECO) Chemistry Practical paper will be written on Wednesday 14th July 2021 from 10:00 am to 12:00 noon.

Here, we will be providing you with the Neco Chemistry alternative to practical past questions and materials that will be used for Examination preparation.

Also Read: NECO Chemistry Answers for 2021 SSCE Released

neco chemistry practical answers

Neco Chemistry Practical 2021 Questions.

Candidates for the Neco chemistry practical will get the usual apparatus and reagents for qualitative work. The Neco chemistry practical reagents will include;
(i) Dilute sodium hydroxide solution
(ii) Dilute ammonia solution
(iii) Dilute hydrochloric acid
(iv) Dilute trioxonitrate(V)acid
(v) Distilled water
(vi) Red and blue litmus paper
(vii) Potassium hexacyanoferrate(III)
(viii) silver trioxonitrate(V)
(ix) Methyl orange

The NECO Chemistry Practical apparatus are as follows;
(a) one boiling tube.
(b) Five test tubes.
(c) Filtration apparatus.
(d) source of heat.

Each candidate should be supplied with the following An,Bn,Cn. Where “n” is the candidate’s serial number. 150cm³ of hydrochloric acid solution in a bottle labelled “An”. The acid solution which should be the same for all candidates will contain 12.0cm³ of concentrated hydrochloric acid per dm³ of solution.

150cm³ of sodium trioxocarbonate(IV)solution in a bottle labelled “Bn”. The solution which should be the same for all candidates will contain 6.36g of sodium trioxocarbonate(IV) per dm³ of solution. One spatulaful of iron(II)chloride salt in a specimen bottle labelled Cn.

NECO Chemistry Practical 2020.

QUESTION 1: In an experiment, 20.0cm3 portions of 0.065 mol dm-3 NaOH were titrated against dilute HCl. The table below shows the results of the titration;

Burette readings {cmt] 1st 2nd 3rd
Final reading [cm-] 23.50 46.60 47.40
Initial reading [cmt) 0.00 23.50 24.00
Volume of acid used 23.50

23.10

23.40

(a) (i) Name a suitable indicator for the titration. Give a reason for your answer.
(ii) Give the colour of the indicator in the base and at the endpoint.
(iii) What type of reaction is demonstrated by the experiment?
(b) (i) Write a balanced equation for the reaction
(ii) Determine the average volume of acid used.
(c) Calculate the (i) concentration of the acid in mol dm-3
(ii) concentration of the acid in g dm-3
(iii) mass of HCl in 20cm3 of solution [H = 1.00, Cl = 35.5 ]

QUESTION 2: C was a mixture of an inorganic salt and organic compound. Tests were carried out on C.
Copy and complete the table and hence state what C could be.

Test Observation Inference

(a) (i) C + 10cm3 of distilled C partially dissolved

water, stirred and filtered to give colourless

filtrate and a white

residue

(in

Filtrate + Litmus paper

Neutral filtrate

(b)

(i)

First portion of filtrate +

AgN03(aq)

+HN03(aq)

+NH3(aq)

Cl- confirmed

(ii)

Second portion of filtrate White gelatinous

+ NaOH(aq) in drops precipitate

then in excess Precipitate dissolved

(iii)

Third portion of filtrate White gelatinous

+ NH3(aq) in drops precipitate

then in excess Precipitate dissolved

(c)

(i) Portion of residue +

Starch present

Iodine solution

(ii)

Portion of residue +

Starch

HCl(aq) and boil

hydrolysed

cool and add iodine

solution

QUESTION 3: (a) Outline how a mixture of ammonium chloride, potassium chloride and lead (II) chloride could be separated in the laboratory.
(b) Name one drying agent that is
(i) solid,
(ii) liquid
(c) Mention one laboratory apparatus used for:
(i) preparing a standard solution;
(ii) converting vapour to liquid;
(iii) keeping solid samples dry;
(iv) generating gases intermittently;
(v) determining the pH of a solution. [5 marks]
(d) (i) Describe a chemical test that could be used to distinguish between pure water and sodium tetraoxosulphate(VI)solution
(ii) Zn(OH)2 and Ca(OH)2 are white substances What reagent would be suitable to distinguish between the two substances?

If you have any questions, endeavour to use the comment box below.


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