JUPEB 2022/23 CHEMISTRY ANSWERS
2022/23 VERIFIED JUPEB CHEMISTRY ANSWERS
2022 Legit Chemistry Questions & Answers for Jupeb by Oliveloaded.ng
A molar solution of a compound contains one mole or the molar mass of the compound in one dm³ of the solution.
(i) Identification of gases
(ii) Identification of acidic and metallic radicals
(i) Purification of bauxite
(ii) Electrolysis of alumina
(2bi) DIAGRAM STRUCTURE ☝️☝️
This is because of the presence of copper which is a transition metal
(i) Methanamide is a liquid while the rest amides are crystalline solids
(ii) Melting points and boiling points of aides are much higher than expected.
(i) Heavy chemicals are produced in very large quantities in industries While fine chemicals are produced in small quantities for specific purposes
(ii) Heavy chemicals are in a crude state While fine chemicals are purified.
(i) Million’s reagent
(ii) Feeling’s solution
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 its density.
RO₂/RCH₄ = √(MCH₄/MO₂)
5/(200/t) = √[(12+4)/(16×2)]
5t/200 = √16/32
t/40 = 1/√2
t = 40/√2
t = (40/√2) × (√2/√2)
t = 20√2 seconds
Time taken = 28.28 seconds.
(i) Discount allowed is granted by the seller to the buyer.
(ii) The discount allowed is the expense of the seller.
(iii) Discount allowed is debited in the books of the seller.
(i) The discount received is received by the buyer from the seller.
(ii) Discount Received is an income of the buyer.
(iii) Discount Received is credited in the books of the buyer.
(i) Cash book
(ii) Purchases book
(iii) Sales book
(iv) Purchases return or return outwards book
(v) Sales return or return inwards book
ERROR IT REVEALS
(i) Wrong Totaling of
Posting of the Wrong Amount
ERROR THAT DOESN’T AFFECT IT
(i) Error of principle
(ii) Error of commission
(iii) Error of omission
(i) Accumulated fund: An accumulated fund is a type of account that serves as the repository for funds that are collected over time by non-profit organizations and are above and beyond the money needed to cover operational and other expenditures.
(ii) Depreciation: It’s the reduction of a recorded cost of a fixed asset in a systematic manner until the value of the asset becomes zero or negligible.
(iii) Nominal Capital: It’s the amount of capital that a business can offer to shareholders, in the form of shares of stock. In most nations, the amount of this nominal share capital is regulated by governmental agencies that determine the financial stability of the business and the company’s ability to cover the value of those shares.
(iv) Bad debt: Bad debt is an expense that a business incurs once the repayment of credit previously extended to a customer is estimated to be uncollectible and is thus recorded as a charge off.
(v) Net profit: is the amount of money your business earns after deducting all operating, interest, and tax expenses over a given period of time.
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I – C₂H₂OH + H₂SO₄ —>C₂H₅HSO₄ + H₂O
II – C₂H₅HSO₄ —> C₂H₄ +H₂SO₄
(i) They incompletely filled d-orbitals
(ii) They exhibit variable oxidation state
(i) It is used in making aeroplane parts due to its tensile strength
(ii) It is used in making window frames because it cannot be easily oxidised
A white precipitate is formed with evolution of brown gas
(i) Hydrogen bond
(ii) Covalent bond
H₂SO₄ + 2NaOH —> Na₂SO₄ +2H₂O
CaVa/CbVb = Na/NB
Va = CbVbna/Can
Va = 0.1×25×1/0.5×2
Va = 2.5cm³
Rate of a chemical reaction is defined as the number of moles of reactant converted or product formed per unit time.
Mass of CaCO3 = 3g
Molar mass of CaCO3= 100g/mol
No. of moles = 3/100 = 0.03
Time = 2×60 = 120s
Rate of reaction = No. of moles/Time
= 0.03/120 = 2.5 × 10-⁴
(i) They are more resistant to corrosion
(ii) They are more durable
(iii) They have lower melting point
2Pb(NO₃)₂ —> 2PbO + 4NO₂ +O₂
I =Hard water=
(i)It has better taste than soft water
(ii) It can be supplied in lead pipes as it does not dissolve lead
II =Soft water=
(i) It does not deposit scale in boilers and fur in kettles
(ii) It does not waste soap
I – CO
II – SO₂
I – Hardness
II – Lustre appearance
III – Conductivity
IV – Ability to absorb
4.3/2.12 = 142+18x/142
2.12(142+18x)/2.12 = 4.3*142/2.12
142+18x = 288
18x = 288-142
x = 146/18
x = 8
B; a ripe mango fruit
C; Transverse section of tomato fruit
D; Groundnut seed
E; maize grains
(i) objective lens
(ii) nose pierce
It is use to magnify object that is to be viewed
(1bi) DIAGRAM ABOVE
(i)its flesh are eaten by animals
(ii)the seeds are passed out as waste by some animal
(i)it is yellowish in colour
(ii)beans like shaped
(i)it is reddish in colour
(ii)not beans like shaped
(i)light passes through it but the other side can not be seen
(i)it contains oil which makes the paper a translucent material
Fats and oil
It serves as food.
G; Irish potato
H; water Lily
It improve sight
This is because it has a modified stem
(i)it gives a blue black colour
(i)starch is present
(i)presence of big leaves
(ii)presence of cuticle
(iii)presence of horns
(iv)presence of rims
(i)presence of tail fin
(ii)presence of scales
Under External features
(i)it serves as food
(ii)it create employment opportunity
J; Tilapia Fish.
Will Be Posted by 8am!!!
(i)presence of wings
(ii)presence of book lung
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