WAEC Chemistry Questions and Answers 2022

WAEC Chemistry Questions and Answers 2022 is now Available for the May/June 2022.  WAEC Chemistry Theory and Objective Answers (100%legit) Chemistry 2 Essay verified Free  (Expo) for West African Examinations Council.

WAEC Chemistry Questions For you to have accurate WAEC end result in  Chemistry in addition to repeated questions free of charge on this post. You will even recognize how WAEC Chemistry questions are set and a way to solution them. The West African Examinations Council is an exam board hooked up via way of means of regulation to decide the examinations required within side the public hobby within side the English-speak me West African countries, to behavior the examinations and to award certificate akin to the ones of equal analyzing government internationally

 WAEC Chemistry Questions and Answers 2022 (Expo)

 

Chemistry 2 (Essay) – 2:00pm – 4:00pm
Chemistry 1 (Objective) – 4:00pm – 5:00pm


CHEMISTRY OBJ:
1-10: ABADCCBDCA
11-20: DCABCBBCCB
21-30: ADCADAABCA
31-40: CBBCCBCCBB
41-50: CACBCBADCA

 


 

(2)

 


 

(3)


(5)

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(1a)
(i)An acid is any compound which, in a chemical reaction is able to attach itself to an unshared pair of electrons in another molecule-a base, to form a new compound.

(ii)
Alcl₃

(1b)
Salting out is the process of adding concentrated sodium chloride solution to soap, to decrease the solubility of the soap. It consequently separates out as a hard cake on the surface or cooling.

(1c)
Reagent: {Ammonical solution of Silver trioxonitrate(v) [AgNo₃]}
Condition: {At room temperature}

(1d)
The percentage abundance of an isotope is the percentage of all naturally occurring atoms with a specific atomic mass of an element.

(1e)
(i)The element with atomic number 18 has electronic configuration 2,8,8. It has a completely filled valence shell. It is therefore inert. Hence it cannot have an oxide.

(ii)Being a covalent compound, the intermolecular forces between the Cl₂O molecules are weak and easily overcome.

(1f)
Add barium chloride solution to H₂SO₄ and HNO₃ separately. A white precipitate is formed in H₂SO₄ and no such precipitation is formed in HNO₃.

(1g)
(i)The main difference is that electrochemical cell does not need any external current for operation whereas electrolytic cells need external current to operate.

(ii)Also, Oxidation occurs at the positive electrode and reduction at the cathode, in the electrolytic cell. While the reverse is the case in electrochemical cells.

(1h)
As we go down group 1 from top to bottom, it gets easier to remove the valence electron and form the positively charged cation. Hence group 1 elements increase in chemical reactivity as we go down the group

(1i)
Molecular formula is a chemical formula that gives the total number of atoms of each element in each molecule of a substance.

(1j)
(i)Ammonia, NH₃ will deviate more than hydrogen gas H₂

(ii)
-Ammonia have stronger intermolecular forces than H₂
-Ammonia has more volume than H₂ at the same concentration


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Chemistry 2 (Essay) 2:00pm. – 4:00pm.
Chemistry 1 (Objective) 4:00pm. – 5:00pm


Chemistry OBJ:
1-10: CDBAAAACAD
11-20: CBBCDCCADB
21-30: CACCABACBC
31-40: DBCBDCBABD
41-50: CBBCCABDDA


INSTRUCTION: YOU ARE TO ANSWER FOUR(4) QUESTIONS IN ALL.

QUESTION ONE(1) IN SECTION A & ANY THREE(3) QUESTIONS IN SECTION B.

NOTE: USE EITHER THE TYPED VERSION OR THE IMAGE VERSION… make your work look different.

(4bvi corrected)
Take note


(2)


(4)


(5)



SECOND VERSION – TYPED


(1a)
A molecular formula consists of the chemical symbols for the constituent followed by numeric subscripts showing the number of atoms of each element present while structural formula consists of symbols for the atoms connected by short lines that represent chemical bonds.

(1b)
(i) The distance of the outermost electron
(ii) The size of the positive nuclear charge
(iii) The screening effect of the inner electron

(1c)
(i) The reaction must proceed both forward and backward i.e reversible
(ii) All the reactants and products are present at equilibrium

(1d)
(i) B is the strongest reducing agent
(ii) It has the least ionization energy among the three

(1e)
(Pick one)
Graham’s law of diffusion states that the rate of diffusion of a gas is inversely proportional to the square root of their densities provided other conditions remained constant

OR

Graham’s law of diffusion states that at a constant temperature and pressure ,the rate of diffusion of a gas is inversely proportional to the square root of it’s density.

(1f)
(i) Na2SO4, Mg(NO3)2
(ii) CaCO3

(1g)
(i) Protein – condensational polymer
(ii) Perspex – additional polymer
(iii) Nylon – Condensation polymer

(1h)
Atomic radius can be defined as the half distance between the nucleus of two covalently bonded atoms.

(1i)
Ethanol has a higher boiling point than propane because it has stronger force of attraction than propane which has a weak van der waal’s force.

(1j)
(i) It aids the digestion of food
(ii) It aids the action of enzymes
(iii) It controls the availability of nutrients


(3ai)
H2SO4 (aq) + 2KOH(aq) —> K2SO4(aq) + 2H2O(l)

(3aii)
Given, Va = 25.0cm³, Vb = 24.0cm³, Cb = 0.15mol/dm³, Ca =?, Na = 1 , Nb = 2
Using,
CaVa/CbVb = Na/Nb
Ca = CbVbNa/VaNb
Ca = 0.15 × 24.0 × 1/25.0×2
Ca = 3.6/50 = 0.072mol/dm³

(3bi)
(i) 2Mg(s) + CO2(g) —> 2MgO(aq) + C(g)
(ii) This is because magnesium can reduce carbon (iv) oxide to black carbon and producing magnesium oxide

(3bii)
Mg(NO3)2
M of Mg(NO3)2 = 24+(2×14) + (6×16)
= 24 + 28 + 96
= 148g/mol
% of N = 28/148 × 100/1
N = 18.9%

(3ci)
(i) Reaction with KMnO4
(ii) Reaction with bromine water

(3cii)
It turns them colourless

(3d)
Boil the vegetable oil in sodium hydroxide solution, it breaks down releasing the organic acid and the alkanol. The process is known as saponification. The organic ester is immediately neutralized by the sodium hydroxide solution to form the sodium salt of the organic acid which is soap.


(4ai)
(i) Graphite – Hexagonal
(ii) Diamond – Octahedral

(4aii)
Diamond us hard because of the strong force of attraction that hold them together and it can not conduct electricity because all the available electrons are used for bonding while Graphite is soft because it’s particles are in layers and can conduct electricity because not all the electrons are used for bonding

(4bi)
(i) It helps to remove dissolved gases and oxidizes dissolved metals
(ii) It helps to remove objects such as rags, paper, plastics, and clogging of downstream equipment
(iii) It reduces particle concentration in water and minimizes the need for coagulation and flocculation

(4bii)
(i) Calcium tetraoxosulphate (vi)
(ii) Calcium hydrogen trioxocarbonate

(4biii)
(i) Filtration
(ii) Boiling

(4biv)
It has a sweet taste and it builds the shells of lower organisms

(4ci)
The ore (SnO2) is wasted out of the ground with water, powdered, washed and roasted to drive off oxides sulphur, arseric and antimony. The roasted one is now reduced by heating with coke in a reverberatory furnace and molten tin is tapped off from the bottom of the furnace. The tin obtained is impure and it is remelted on a slopping furnace in which the tin melts and run its moulds. The tin obtained is 99.9% pure

(4cii)
SnO2(g) + 2C(s) —> Sn(l) + 2CO(g)

(4ciii)
(i) Sn(g) + O2 —> SnO2(g)
(ii) Sn(g) + 2Cl(g) —> SnCl4(g)

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CHEMISTRY OBJ:
1-10: EECEBAEEBB
11-20: DDDBEACABB
21-30: CDECCDAAAB
31-40: BAECBBCDAC
41-50: CECCEBDBDC
51-60: CEBEEDDBAE

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(1)

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

(2)

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(3)

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(4)


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 (5)


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(6)

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2022 NECO Chemistry Questions & Answers [28TH July, 2022]

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