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Author Topic: CORRECT: 2019/2020 WAEC CHEMISTRY Questions And Answer Expo/Runs free  (Read 3586 times)

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Offline Mbaanyam Day

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Pls Admin. we're waiting for your quick and favorable response

Offline lordbash

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Please I need the answers time is going

Offline DON PEDRO

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admin what is happening today?
please help us oooo

Offline Mbaanyam Day

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1a)

(i)High temperature of 4500C or more

(ii)High pressure
(iii)Catalyst
(1b)
(i)For decoration
(ii)For protection against corrosion
(1c)
(i)Calcium oxide(CaO) is alkaline and HCl is acidic.The two react to form calcium chloride and water.
(ii)Conc. H2SO4(aq)
(1d)
Conc. HNO3(aq) reacts with a solution of FeSO4(aq) the Fe^2+ was oxidized to yellow Fe^3+ and brown NO2(g) given off
i.e 2HNO3(aq) + 2FeSO4(aq) + H2SO4 —-> Fe2(SO4)3 +2NO2(g) +2H2O
(1ei)
ZnO + H2SO4 —>ZnSO4 +H2O
ZnO +2NaOH + H2O —>Na2Zn(OH)4
(1eii)
Basic oxide
(1f)
(i)They have the same number of proton
(ii)They have different mass number
(1g)
Hydrochloric acid and oxygen
(1h)
(i)H2S
(ii)SO2
(1i)
It is the average mass of atoms of the element on which one atomof carbon
It is the number of times the average mass of one atom of the element is heavier than 1/12th of the mass of one atomw carbon 12
(1j)
(i)Rate of forward reaction is equal to rate of backward reaction
(ii)It is reversible

 

(2a)
(i)C10H22—–>(cracking)—->C6H14 + C4H8
P is C4H8
(ii)
H H H H
| | | |
H-C=C-C-C-H
| |
H H

H CH3 H
| | |
H-C= C- C-H
|
H
(iii)

(2b)
Hundi’s rule:Electrons occupy each orbital singly first before pairing takes place in a degenerated orbital
Aufbau’s principle:Electrons enter into orbitals in order of increasing energy

Offline Faithdarling

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C.R.K Wasn't Gvn 2d Student 2day, Bt God Lives Sha!

Offline SirLancelottt

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1-10 DADBADACBD
11-20 AAB-ACDADD
21-30 ABDCDABCD-
31-40 D-ADCA-A- -C
41-50 AAB-ABDABA

(5ai)
DRAW THE DIAGRAM
(5aii)
(i) It is used in the sterilization of water for domestic and industrial use and in the
treatment of sewage
(ii) It is used as a bleaching agent for cotton linen and wood -pulp
(5b)
Preparation of hydrogen from water gas :
This is called Bosch process: In this process large quantities of hydrogen are
produced from cheap raw materials namely water and coke when steam is passed
over red hot coke (carbon) at about 1200C, a mixture of carbon(II) oxide and
hydrogen ion and water gas is produced .Excess steam is then mixed with the water
gas and passed over a catalyst iron(III) oxide at 450C.As a result the carbon
(II )oxide in the water gas is converted by CO2 with a further yield of hydrogen
Endothermic reaction
H2O(g) + C( s) ---> CO(g)
(5ci)
The chief ore of aluminium is bauxite
(5cii)
The ore of aluminium is purified by electrolysis to remove the impurities present
(5ciii)
Carbon or platinum electrodes
(5civ)
Cryolite is added to remove the impurities present
(5d)
Coal, coal tar, ammoniacal liquor

Offline SirLancelottt

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chemistry obj
1-10 BCCADADACA
11-20 DDCACCDCBA
21-30 DCAABDBBAA
31-40 BACBDCDBCB
41-50 BDCCCCBDDD

Offline Zuubu

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what of Government

Offline JUSTICE MORGAN

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chemistry practical alternative B urgently needed :-[

Offline JohnpaulB

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Pls government answers oooooo

Offline SirLancelottt

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Q1
(1)Voting:
We study governments so we can make an educated decision when it comes to voting. This means that you are not just going to make your voting decision on a speech or tv program that you see. You are going to be able to have a clear understanding of the different policies which are in place and you can compare one party to another, ensuring you make the right decision for you.

(2)Knowledge:
Studying government gives you knowledge. You are in a position to know more about the government than ever before. If you do not study governments then you are not going to know all of the ins and outs of politics.

(3)Future:
We can control the future of our country, including political movements and government decision making. Studying government is going to ensure that you can make a difference.

(4)Improvements:
There is always going to be the option to make improvements within different governments. If a government does not have a clear idea on one of their policies, this can be changed and improved over time, and you can understand this when you study the subject.

(5)Career choices:
Studying the government is going to open many doors for you and you can decide whether or not you want to go into a career in politics (to make a difference as much as you see fit).
There are many different reasons why we study politics, and it is mainly to have a clear understanding of how things operate and to ensure that improvements can be made in the future.

 

(2a)
A citizen is a person who is a legal member of and owes allegiance to a particular country he/she resides in which he/she enjoys full civil and political rights and will be ready to put his life at stake in defence of its territory when occasion calls for that

(2b)
(i) Defence of the country: A citizen should be prepared to defend his/her country when it is threatened
(ii) Service to the nation: A citizen should not hesitate to serve his/her nation in any capacity he capable when called upon to do so.
(iii) Civic responsibilities: It is also the responsibility of a good citizen to register during registration exercise and vote during elections if he/she is qualified to do so.
(iv) Assisting the law enforcement agents: A good citizen should always be prepared to assist the police and other law enforcement agents in reducing crime rate in the country by giving them useful information

 

4a)
Local government is defined as the government at the grassroots established to perform some specific functions within defined areas.

4b
Making Bye law
ii )Government at the grassroo
(iii) to bring government nearer to the people
iv) maintenance of law and orders
(V) collection of tax and rates
(Vi) provision of primary schools.

 

Q5
*Types of election*

1. General Election: refers to the conduct of election for various political parties, to enable them elect or choose their representatives in the state.

2. Referendum: is a type of election, demands to get on important political matter in the state, for example, when Sierra Leone wants to return to one party state in 1978. Also if important constitutional matters needed to be amended. It is similar to plebiscite.

3. Bye-election: is an election held to fill a vacant seat in a constituency due to a death of a representative or nullification of an election result in the court.
Note: Bye-elections are conducted only on constituencies where the incidence took place e.g.. Sierra Leone Bye elections to be conducted by N.E.C in Constituencies-87 & 106

4. Run-off election or second ballot: it takes place in order to decide a winner after the first election failed to produce the winner with absolute majority. After the first election, candidates with low percents of the total votes cast are asked to withdraw and a second election for highest two is organized within a given period of time. In some countries, it will be done in weeks or months. A simple majority will declare the emerged winner

 

(6a)

i. Clifford Constitution Of 1922

ii. Richard ’s constitution of 1946

iii. Lyttleton
Constitution of 1954

6b

1. Establishment of full regional self-government for the east and west in 1957 and for the North in 1959.
2. That the office of the prime minister of Nigeria should be established.
3. The federal legislature would comprise two houses, the senate and house of representatives.
4. Southern Cameroons would become a region, with its own premier.

 

 

(7a)
(i)Multi-Ethnicity : Nigeria is a country with a lot of ethnic groups. As a result of this, it has brought about the cry of the minorities clamoring for their own state.

(ii)Power Sharing: Formula Power sharing has been one of the main issue militating against federalism in Nigeria.

(7b)
(i)Governmental powers are shared between the Federal and State governments.
(ii)Its operation is backed up by a federal constitution, which is usually written and rigid in nature.
(iii)It ensures equal representation of all groups.

Offline SirLancelottt

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8a)
(i) Ernest Ikoli
(ii) Samuel Akisanya
(iii) Dr. James Churchill Vaughan

(8b)
(i) Legislative council: It won all the three elective seats allocated to Lagos in the legislative council
(ii) Unity: It worked to promote national unity
(iii) National outlook: It was the first political party that had a national outlook in the competition of members
(iv) Modern nationalism: It could further be said that this movement brought modern nationalism to Nigeria.

Offline SirLancelottt

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Obj
1-10 ABABDCBAAB
11-20 DDDADCADBB
21-30 BDCBBBDCBB
31-40 CCDDBDCAAA
41-50 DABBABABDB

Offline Zuubu

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what about core science

Offline Able

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civic education Answer please

Offline handilanrio

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(4)
(i)They lie; They have to tell lies to mislead people about where they were when they were really out buying or using drugs or alcohol. They have to lie about where the hundreds or thousands of dollars went. The more they feel they need drugs, the more likely they are to feel the need to lie.

(ii)They manipulate; They try to encourage good decisions but the addicted person is on a destructive track. The allure of the drugs is so powerful, she feels she needs the drugs to function, to be able to get through another day, to not get desperately sick from withdrawal. So she manipulates those who love her the most

(iii)They are very likely to be engaged in criminal acts; Eventually, the money runs out. They have pawned or sold everything of value. They owe friends and family money. There are no more assets but the drugs or alcohol have to be obtained.
At this point, many people will begin committing crimes. Selling or manufacturing drugs are common ones.

(iv)An addict will shift the blame; this person may have lived their prior life as a highly responsible individual, drug addiction steals that quality away. Whatever happens is never his fault. If he gets fired from a job, it’s the boss’s fault, the addict was unfairly targeted. If he gets in a car accident, it was totally someone else’s fault. If he fails at some activity, those close to him will be blamed.

(v)An addict is very likely to become abusive; It’s tragic that an addict’s blame can even take a violent and abusive form. With the delusional thinking common to most addicts, he can perceive those around him as being threatening, dangerous or malicious. As he shifts the blame, he may physically, mentally or emotionally attack those he blames
=============================================
(6ai) HIV stands for human immunodeficiency virus. It is the virus that can lead to acquired immunodeficiency syndrome, or AIDS, if not treated. HIV attacks the body’s immune system, specifically the CD4 cells (T cells), which help the immune system fight off infections. Untreated, HIV reduces the number of CD4 cells (T cells) in the body, making the person more likely to get other infections or infection-related cancers.

(6aii) AIDS : This is the stage of HIV infection that occurs when your immune system is badly damaged and you become vulnerable to opportunistic infections. When the number of your CD4 cells falls below 200 cells per cubic millimeter of blood (200 cells/mm3), you are considered to have progressed to AIDS. (In someone with a healthy immune system, CD4 counts are between 500 and 1,600 cells/mm3.) You are also considered to have progressed to AIDS if you develop one or more opportunistic illnesses, regardless of your CD4 count.

(6b)
- diarrhea
- nausea and vomiting
- weight loss
- severe headache
- joint pain
- muscle aches
- shortness of breath
- chronic cough
- trouble swallowing

Offline Able

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Offline Henrygt

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