NECO Chemistry Questions and Answers 2022 (Theory & Obj) Legit Free Expo Answers

jamb expo portal, best jamb expo website, WAEC website,jamb expo website, jamb expo 2022, 2022 jamb expo solution runs
5
(1)

NECO Chemistry Questions and Answers 2022. You will see  NECO Chemistry 2022 (Theory & Obj) Legit Free Chemistry theory and  Obj expo answers and  repeated NECO Chemistry questions 2022 for free National Examination Council runz/runs.

jamb expo portal, best jamb expo website, WAEC website,jamb expo website, jamb expo 2022, 2022 jamb expo solution runs

You will also understand how NECO Chemistry Questions are set and how to answers them in order to have excellent NECO result. The National Examination Council is an examination body in Nigeria that conducts the Senior Secondary Certificate Examination and the General Certificate in Education in June/July and November/December respectively

Note: You can join our free NECO Questions and Answers 2022 expo WASAP Group  Click Here To Join Joberplanet Free NECO expo Telegram Group

*******How To Join The NECO Chemistry WHATSAPP Vip Group FOR Mid Night Questions ANSWERS*******

How useful was this post?

Click on a star to rate it!

Average rating 5 / 5. Vote count: 1

No votes so far! Be the first to rate this post.

See also  2022 NECO Mathematics Questions and Answers 2022 (Theory & Obj Verified Expo)

5 Comments

  1. (2ai)
    A molar solution of a compound contains one mole or the molar mass of the compound in one dm³ of the solution.

    (2aii)
    (i) Identification of gases
    (ii) Identification of acidic and metallic radicals

    (2aiii)
    (i) Purification of bauxite
    (ii) Electrolysis of alumina

    (2bi)
    [img]https://i.ibb.co/vPBwDjB/IMG-20220725-WA0082.jpg[/img]

    (2bii)
    This is because of the presence of copper which is a transition metal

    (2bii)
    (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.

    (2ci)
    (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.

    (2cii)
    (i) Million’s reagent
    (ii) Feeling’s solution

    (2ciii)
    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.

    (2civ)
    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.

  2. Chemistry 👇👇
    1ai)
    (i) KAl(SO₄)₂. 12H₂O
    (ii) Na₂SO₄
    1bii)
    (i) It is used for combustion
    (ii) It is used for artificial respiration

    (1biii)
    This is because room temperature is warmer

    (1biv)
    (i) Methyl orange
    (ii) Phenophthalein

    (1ci)
    An ion is an atom or molecule which has a net electric charge due to the loss or gain of one or more electrons.

    (1cii)
    HCl gas doesn’t contain ions

    (1cii)
    (i) Noble gases: Neon, Helium
    (ii) Halogens: Iodine, Fluorine
    (iii) Alkaline earth metals: Calcium, Magnesium

    (1civ)
    Halogens attain stable octet configuration by accepting an electron from donors Group I elements.

    (1di)
    A sol is a colloid where solid particles are dispersed in liquid medium.

    (1dii)
    Jelly

    (1diii)
    (i) Acid-base titrations are used to determine the percentage purity of a substance
    (ii) Acid-base titrations are important to determine the number of water molecules in a hydrate.
    (1aii)
    Number of moles of sodium reascted = reacting mass/molar mass
    = 3.6/23
    = 0.1565moles
    Number of moles of oxygen reacted = (1/4) x Number of sodium
    = 1/4 x (3.6/23)
    = 0.03913
    Reacting mass of oxygen = Number of moles x molar mass
    = 0.03913 x (16×2)
    = 1.252grams

    (1bi)
    Air in gaseous form is first passed through caustic soda to remove CO₂. It is compressed and cooled until ut becomes a liquid at -200°C. It is then led to a fractionating column. On distillation, Nitrogen which has a lowet boiling point of -196°C is evolced first leaving behind Oxygen in liquid form. Further heating converts the liquid to a gas at -183°C.

  3. 6ai)
    Rate of a chemical reaction is defined as the number of moles of reactant converted or product formed per unit time.

    (6aii)
    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

    (6aiii)
    (i) They are more resistant to corrosion
    (ii) They are more durable
    (iii) They have lower melting point

    (6aiv)
    2Pb(NO₃)₂ —> 2PbO + 4NO₂ +O₂

    (6bi)
    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

    (6bii)
    I – CO
    II – SO₂

    (6biii)
    I – Hardness
    II – Lustre appearance
    III – Conductivity
    IV – Ability to absorb

    (6c)
    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

  4. [7/25, 10:54 AM] Naijahero: 5ai)
    (i)Chlorofluorocarbons
    (ii) Hydrofluorocarbon

    (5aii)
    I – C₂H₂OH + H₂SO₄ —>C₂H₅HSO₄ + H₂O
    II – C₂H₅HSO₄ —> C₂H₄ +H₂SO₄

    (5aiii)
    (i) They incompletely filled d-orbitals
    (ii) They exhibit variable oxidation state

    (5bi)
    (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

    (5bii)
    A white precipitate is formed with evolution of brown gas

    (5biii)
    (i) Hydrogen bond
    (ii) Covalent bond

    (5ci)
    (i) Oxidation
    (ii) Electrolysis

    (5cii)
    (i)Temperature
    (ii)Concentration

    (5ciii)
    H₂SO₄ + 2NaOH —> Na₂SO₄ +2H₂O
    CaVa/CbVb = Na/NB
    Va = CbVbna/Can
    Va = 0.1×25×1/0.5×2
    Va = 2.5cm³
    °°°°°°°°°°°°°°°°°°°°°°
    [7/25, 10:54 AM] Naijahero: 6ai)
    Rate of a chemical reaction is defined as the number of moles of reactant converted or product formed per unit time.

    (6aii)
    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

    (6aiii)
    (i) They are more resistant to corrosion
    (ii) They are more durable
    (iii) They have lower melting point

    (6aiv)
    2Pb(NO₃)₂ —> 2PbO + 4NO₂ +O₂

    (6bi)
    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

    (6bii)
    I – CO
    II – SO₂

    (6biii)
    I – Hardness
    II – Lustre appearance
    III – Conductivity
    IV – Ability to absorb

    (6c)
    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

Leave a Reply

Your email address will not be published.


*