2019 WAEC CHEMISTRY OBJ & ESSAY QUESTIONS AND ANSWERS NOW AVAILABLE

2019 WAEC CHEMISTRY OBJ & ESSAY QUESTIONS AND ANSWERS NOW AVAILABLE

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CHEMISTRY OBJ
1-10: BCACDADACA
11-20: DDCADAACBA
21-30: BCABBDDBAA
31-40: DDCBDCDBCB
41-50: BACBCCBDDD

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(1a)

-High temperature is required

-High pressure

-The presence of Catalyst

(1b)

(i) To avoid corrosion

(ii) To avoid rusting

(1ci)

Calcium oxide (CaO) is alkaline and Hcl is acidic. The two react to form calcium chloride and water; instead of dry Hcl, after that, it will end up with wet calcium chloride.

(1cii)

Concentrated H2SO4(aq)

(1d)

Conc HNO3(aq) reacts with a solution of FeSO4(aq). The Fe2+ was oxidised to yellow Fe3+ and brown NO2(g) was given off.

ie 2HNO3(aq) + 2FeSO4(aq) + H2SO4 -> Fe2(SO4)3 + 2NO2(g) + 2H2O

(1ei)

(I) ZnO(s) + H2SO4(aq) —> ZnSO4(aq) + H2O(l)

(II) ZnO(s) + NaOH(aq) —> Na2ZnO2(s) + H2O(l)

(1eii)

(III) Amphoteric property

(1f)

(i) They have the same number of atoms

(ii) They have different neutron number which makes their mass number to differ

(1g)

HclO – Oxochlorate(i)acid and Hcl

(1hi)

H2S is undergoing oxidation to S(s)

(1hii)

SO2

(1i)
Carbon-12 scale is the standard from which atomiv masses of all nucleids are measured. It is used to ascertain mole of a substance as the amount of substance which contains as many elementry entities as there are atoms in 12 grams of carbon-12.

(1j)
(i) The concentration of thereactants and products are equal
(ii) The rate of the forward reaction is same as rate of the backward reaction

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(2ai)
C10H22—–>(cracking)—->C6H14 + C4H8
P is C4H8

(2aii)
H H H H
| | | |
H-C=C-C-C-H
| |
H H

H CH3 H
| | |
H-C= C- C-H
|
H

(2aiii)
P would be polymerized because it is an alkene(butene) or an unsaturated hydrocarbon

(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

(2ci)
NaH-Ionic
H2-Covalent
H2S-Covalent
NH4Cl-Vanderwaals

(2cii)
NaH-Soluble(dissolves)
H2-Insoluble
H2S-Moderately soluble
NH4Cl-Soluble

(2d)
(i) Number of unpaired electrons is zero
(ii) J would be a good reducing agent
(iii)It is found in group 2, It is a metal and Metals are good reducing agent

NO2

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(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)

(5c)
(i)Bauxite (Alx(OH)3-2x)
(ii)To remove impurity
(iiiCarbon
(iv)It serves as a solvent for the ore
(5d)
Coke,Wood charcoal,Animal charcoal

 

 

 

 

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2019 WAEC CHEMISTRY OBJ & ESSAY QUESTIONS AND ANSWERS NOW AVAILABLE

2019 WAEC CHEMISTRY OBJ & ESSAY QUESTIONS AND ANSWERS NOW AVAILABLE

2019 WAEC CHEMISTRY OBJ & ESSAY QUESTIONS AND ANSWERS NOW AVAILABLE

2019 WAEC CHEMISTRY OBJ & ESSAY QUESTIONS AND ANSWERS NOW AVAILABLE