NECO GCE Chemistry Practical Questions 2020 Latest Update

NECO GCE Chemistry Practical Questions 2020 Latest Update.

Chemistry Practical NECO Questions 2020: Chemistry Practical NECO Expo Questions is out now on our website. In this article, I will be showing you past NECO Chemistry Practical random repeated questions for free.

You will also understand how NECO Chemistry Practical are set and many more examination details. All you need to do is to stay focus and follow this guide.

The National Examinations Council (also known as NECO) is an examination body in Nigeria that conducts the Senior Secondary Certificate Examination and the General Certificate in Education. NECO was created by former Head of State Abdulsalami Abubakar in April 1999. It was the first Federal organization to offer subsidized registration to academic candidates in Nigeria.

The Neco chemistry practical is usually divided into 3 questions (comprising of Mechanics, Waves and Electricity) with a few other general knowledge calculations added.

Here is a sample of the NECO chemistry practical answers and solutions from Neco chemistry past questions;

NECO 2020 Chemistry Practical Answers

1ai)

Tabulate

Titrations|Rough|first(1)|second(2)|third(3)

Final burette reading – |20.50|14.90|15.00|15.10|

Initial burette reading – |0.00|0.00|0.00|0.00|
volume of Acide used – |20.5|14.90|15.00|15.10|

1ai)

Average volume of Acid used
1st+2nd+3rd/3
14.90+15.00+15.10/3=45/3=15cm^3

1aii)

2HCL(aq)+Na2CO3(aq)—->2NaCl(aq)+H2O(aq)+CO2(aq)

1bi)

CA VA/CB VB =NA/NB
0.1moldm^-3*15cm^3/CB*25cm^3 *2/1
CB * 25cm^3*2=0.1moldm^-3*15cm^3*1
CB * 50=1.5
CB=1.5/50=0.03moldm^-3

1bii)

25cm^3—->0.03mole
1000cm^3—->x
x=1000*0.03/25=30/25
x=1.2moldm^-3

1biii)

concentration in mold^-3 =Con glm^3 /molar mass
0.03moldm^-3=x/106
x=0.03*106
x=3.18gldm^3

================================

2a)

Tabulate

2ai)

OBSERVATION

i) C dissolves in water
ii) formation of white precipitate
iii) White precipitate dissolves in itel

INFERENCE

i)C is soluble in water
ii)CO3^-2,SO4^-2,SO3^2- suspected
iii)CO3^2-,SO3^2-, suspected

2bi)

OBERSVATION

i)effervescence occurs with the evolution of a gas

ii)the solutions turns to pink

INFERENCE

i)CO3^2-,SO3^2-, suspected
ii)CO3^2-,Confrimed

================================

3ai)

Zinc chloride reaction with HaOH form white gelatinous precipitate solution in excess HaOH.

Ammonium trioxocarbonate(iv) on reaction with HaoH evolves a gas which turns red litmus paper blue and lime water milky.
Calcium trioxocarbonate(iv) on reaction with HaoH forms white powdery precipitate insoluble in excess HaOH.

3aii)

i) Boiling point to determine the purity in a liquid substance and

ii) Melting point to determine the purity in a solid substance

3bi)

Different between boiling n evaporation

Boiling

1. A process in which a substance changes its state from the liquid state to the gaseous state

2. Occurs throughout the liquid

Evaporation

1. A process in which a substance changes its state from the liquid state to the gaseous state without boiling

2. Takes place only from the exposed surface of the liquid

3bii)

Carbon dioxide is use to extinguish fire because carbon dioxide molecules are heavier than oxygen molecules. When the liquid carbon dioxide inside the extinguisher expands into a gas, the carbon dioxide pushes out any oxygen surrounding the fire. Without oxygen available to fuel the chemical reaction, the fire goes out quickly.

3ci)

A 1 molar solution is a solution in which 1 mole of a compound is dissolved in a total volume of 1 litre. For example: The molecular weight of sodium chloride (NaCl) is 58.44, so one gram molecular weight (= 1 mole) is 58.44g.

3cii)

Acid Base indicators

3ciii)

i)methyl orange
ii)Phenolphthalein.

DISCLAIMER! These are not real NECO Chemistry Practical questions but likely repeated questions over the years to help candidate understand the nature of their examinations. Ensure to take note of every questions provided on this page.

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