Joberplanet
    Facebook Twitter Instagram
    Facebook Twitter Instagram
    Joberplanet
    • Jobs Near Me
    • Government
    • Education
    • Banking
    Button
    Joberplanet
    Home»Education»NECO Chemistry Questions and Answers 2023 (100% Sure) Theory & Obj Solution
    Education

    NECO Chemistry Questions and Answers 2023 (100% Sure) Theory & Obj Solution

    By Jobs In Nigeria NowJuly 23, 2023Updated:July 24, 2023No Comments10 Mins Read
    Sponsored Links

    Get free Verified NECO Chemistry Questions and Answers 2023.  NECO June/July Free Chemistry EXPO answers.  National Examination Council Chemistry Theory and Objective Answers for you to have good NECO result. You will also understand how NECO Chemistry questions are set and how to answer them. 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.

    Click Here Now To Chat Us on WhatsApp For Subscription Details

     

     

    Click Here To See All NECO Chemistry Question Paper 2023

    Please Note that the NECO 2023 Chemistry Questions and Answers  and any other NECO expo is provided by us for free. We understand that a lot of website charge of collect money from student to provide NECO expo Chemistry Answers to them. NECO questions and answers are provided for free. We will do same during Other Exam like  NECO GCE.

    NECO 2023 Chemistry Questions  will be  posted in this page. Our Team are right now with the question paper. It is under verification and once the verification process complete, we will go ahead to upload it here.

    Be at alert! Keep refreshing this page for NECO Chemistry Theory Questions and Answers

    2023 Chemistry Essay Questions Loading 93.8%

    Also Read:  How To Check Your JAMB Result

    Click Here To Join The 2023 NECO Direct Link answers Group

    NECO Chemistry Questions and Answers 2023 OBJECTIVES (OBJ) ANSWERS Loading

    2023 VERIFIED Chemistry OBJ:…Loading

    CHEMISTRY-OBJ

    Please Click Here To See The NECO Chemistry OBJ Answers

    CHEMISTRY-Obj!
    1-10   DEADADECAD
    11-20 BAEDDBDBAE
    21-30 CCDCABDDCD
    31-40 EBEECEBCEE
    41-50 BCCECDDADD
    51-60 DABBDEAECA
    Solved By beafans.com
    Completed!!

    NECO Chemistry Questions and Answers 2023 loading…

    Please do not panic and fall into the right hand. 2023 Chemistry Answers will be posted for free here once ready.

    We are right now getting things ready for you. The NECO 2023 Chemistry theory questions and answers will be posted any moment from now. All you need do is to keep refreshing this page until you see the answers.

    NECO Chemistry -ESSAY-ANSWERS-joberplanet.com

    Answers Loading….

    CHEMISTRY-ANSWERS

    (1ai)
    (i) Manufacturing sulfuric acid
    (ii) Vulcanization of rubber
    (iii) Formulation of Pesticides and fungicides

    (1aii)
    (i) It is a colorless gas that has a distinct smell of rotten eggs
    (ii) Hydrogen sulphide is soluble in water to some extent

    (1aiii)
    Soaps are made from natural products while detergents are made from synthetic products.

    (1aiv)
    Detergents is for household cleaning and laundry purposes

    (1bi)
    Number of neutrons = Mass number (A) – Atomic number (Z)

    I. ²³₁₁X
    A = 23 (mass number)
    Z = 11 (atomic number)

    Number of neutrons = 23 – 11 = 12

    II. ³⁹₁₉Y
    A = 39 (mass number)
    Z = 19 (atomic number)

    Number of neutrons = 39 – 19 = 20

    (1bii)
    Molar mass:
    Na = 22.99 g/mol
    O₂ = 2 * 16.00 g/mol = 32.00 g/mol

    Now, let’s calculate the mass of oxygen needed:

    First, calculate the number of moles of sodium (Na) in 9.2g:
    Number of moles = Mass / Molar mass
    Number of moles of Na = 9.2g / 22.99 g/mol ≈ 0.4002 mol

    Since the mole ratio of Na to O₂ is 4:1, the number of moles of O₂ needed is:
    Number of moles of O₂ = 0.4002 mol / 4 ≈ 0.1001 mol

    Now, calculate the mass of oxygen needed:
    Mass of O₂ = Number of moles of O₂ * Molar mass of O₂
    Mass of O₂ = 0.1001 mol * 32.00 g/mol ≈ 3.204 g

    Therefore, approximately 3.204 grams of oxygen are needed to burn 9.2 grams of sodium.

    (1biii)
    CaCO₃(s) + 2 HCl(aq) —> CaCl₂(aq) + CO₂(g) + H₂O(l)

    From the balanced equation, 1 mole of calcium carbonate (CaCO₃) reacts with 2 moles of HCl to produce 1 mole of calcium chloride (CaCl₂).

    Molar masses:
    CaCO₃ = Ca(40.08) + C(12.01) + 3O(16.00) = 100.09 g/mol
    CaCl₂ = Ca(40.08) + 2Cl(35.45) = 110.98 g/mol

    Now, let’s calculate the number of moles of CaCO₃ in 50g:

    Number of moles of CaCO₃ = Mass / Molar mass
    Number of moles of CaCO₃ = 50g / 100.09 g/mol ≈ 0.4998 mol

    Since the mole ratio of CaCO₃ to CaCl₂ is 1:1, the number of moles of CaCl₂ that can be obtained is also approximately 0.4998 mol.

    Thus, about 0.4998 moles of calcium chloride can be obtained from 50g of limestone in the presence of excess hydrogen chloride.

    (1ci)
    (i) Sol: A sol is a colloidal solution in which solid particles are dispersed in a liquid medium.
    (ii) Aerosol: An aerosol is a colloidal solution in which liquid or solid particles are dispersed in a gas medium.

    (1cii)
    The law of definite proportions, also known as the law of constant composition, states that a given chemical compound always contains its constituent elements in fixed and definite proportions by mass. This means that the ratio of the masses of the elements in a compound is constant, regardless of the compound’s origin or method of preparation.

    (1ciii)

    (I) Sodium trioxonitrate (V) is also known as sodium nitrate, with the chemical formula NaNO₃.

    The atomic masses are as follows:
    Na (Sodium) = 22.99 g/mol
    N (Nitrogen) = 14.01 g/mol
    O (Oxygen) = 16.00 g/mol

    Relative molecular mass of NaNO₃ = (1 * Na) + (1 * N) + (3 * O)
    Relative molecular mass of NaNO₃ = (1 * 22.99 g/mol) + (1 * 14.01 g/mol) + (3 * 16.00 g/mol)
    Relative molecular mass of NaNO₃ = 22.99 g/mol + 14.01 g/mol + 48.00 g/mol
    Relative molecular mass of NaNO₃ = 85.00 g/mol

    Therefore, the relative molecular mass of sodium nitrate (NaNO₃) is 85.00 g/mol.

    (II) Copper (II) trioxosulphate (VI) pentahydrate is also known as copper (II) sulfate pentahydrate, with the chemical formula CuSO₄ · 5H₂O.

    The atomic masses are as follows:
    Cu (Copper) = 63.55 g/mol
    S (Sulfur) = 32.06 g/mol
    O (Oxygen) = 16.00 g/mol
    H (Hydrogen) = 1.01 g/mol

    Relative molecular mass of CuSO₄ · 5H₂O = (1 * Cu) + (1 * S) + (4 * O) + (10 * H) + (5 * O)

    Relative molecular mass of CuSO₄ · 5H₂O = (1 * 63.55 g/mol) + (1 * 32.06 g/mol) + (4 * 16.00 g/mol) + (10 * 1.01 g/mol) + (5 * 16.00 g/mol)

    Relative molecular mass of CuSO₄ · 5H₂O = 63.55 g/mol + 32.06 g/mol + 64.00 g/mol + 10.10 g/mol + 80.00 g/mol

    Relative molecular mass of CuSO₄ · 5H₂O = 249.71 g/mol

    If you have any questions about the NECO Chemistry theory & Obj 2023, kindly let us know in the comment box.

    We are happy you are here for  the 2023 Chemistry answers. The complete solution will be made free in some minutes before  the Chemistry examination.

    NECO Chemistry questions 2023, NECO 2023 Chemistry questions and answers, Chemistry NECO 2023, NECO questions 2023/2023, Chemistry 2023,

    Therefore, the relative molecular mass of copper (II) sulfate pentahydrate (CuSO₄ · 5H₂O) is 249.71 g/mol.

     

    (2ai)
    Mass of silver deposited (in grams) = (Current in Amperes × Time in seconds × Atomic mass of silver) / (1 Faraday)

    Given:
    Current = 4.6 A
    Time = 90 minutes = 90 × 60 seconds = 5400 seconds
    Atomic mass of silver (Ag) = 108g/mol
    1 Faraday = 96,500C

    Substituting the values to calculate the mass of silver deposited:

    Mass of silver deposited = (4.6 A × 5400 s × 108 g/mol) / 96,500 C

    Mass of silver deposited ≈ (2,682,720 g·s/mol) / 96,500 C

    Mass of silver deposited ≈ 27.8g

    (2aii)
    (i) Electrode surface area
    (ii) Electrolyte temperature

    (2aiii)
    (i) The oxidizing agent is MnO₄⁻(aq)
    (ii) The reducing agent is Fe²⁺(aq)

    (2aiv)
    MnO₄⁻(aq) + 8H⁺(aq) + 5e⁻ —-> Mn²⁺ + 4H₂O(l)

    (2bi)
    Coming

    (2bii)
    (i) Gases have no fixed shape or volume.
    (ii) Gases have low density compared to solids and liquids.
    (iii) Gases have high kinetic energy and are in constant motion.

    (2biii)
    Faraday’s second law of electrolysis states that the mass of a substance deposited (or liberated) during electrolysis is directly proportional to the quantity of electric charge passed through the electrolyte.

    (2biv)
    (i) Charcoal
    (ii) Coal

    (2bv)
    Na (Sodium) > Ca (Calcium) > Mg (Magnesium) > Al (Aluminum)

     

    (3ai)
    (i) Butan-2-ol – Secondary alkanol
    (ii) 2-methylpropanol – Primary alkanol
    (iii) 2-methylpropan-2-ol – Tertiary alkanol

    (3aii)
    (i) Fermentation
    (ii) Ethylene hydration

    (3aiii)
    Let the relative molecular mass of gas Z be M.
    (Rate of diffusion of hydrogen)/(Rate of diffusion of gas Z) = √(molar mass of gas Z)/√(molar mass of hydrogen)
    6/1 = (√M)/(√2)
    36 = M/2
    M = 2×36
    M = 72

    (3bi)
    1s², 2s², 2p⁴

    (3bii)
    (i) It is a colorless
    (ii) It is soluble in water.
    (iii) It is tasteless

    (3biii)
    (i) Identify the longest chain.
    (ii) Name the substituents alphabetically

    (3biv)
    C₂H₄ + O₂ —> 2CO₂ + 2H₂O

    (3ci)
    Endothermic reaction can be defined as a form of heat reaction in which heat is absorbed from the surrounding into the reacting system.

    (3cii)
    Zn(s) + H₂SO₄(aq) —> ZnSO₄(aq) + H₂(g)

    (3ciii)
    Redox reaction.

    (3iv)
    (i) For refining petrol
    (ii) For food processing
    (iii) For producing fertilizer

     

    (4ai)
    A super saturated solution is a solution that contains more than the maximum amount of solute that is capable of being dissolved at a given temperature.

    (4aii)
    15/345 = Solubility *25/1000

    Solubility =1000*15/25*345=15000/8625

    Solubility = 1.79mol/dm³

    (4aiii)
    (i) H₃0⁺
    (ii) NH₄⁺
    (iii) [CN]⁻₆

    (4bi)
    (i) It has no chemical formula
    (ii) It can be separated physically
    (iii) Freezing air slowly yields different liquids at different temperatures

    (4bii)
    (i) Noble gases
    (ii) Carbon (iv) oxide

    (4biii)
    H₂SO₄ —-> 2H+ + SO₄²⁻

    1 mole of H₂SO₄ = 2 mole of H⁺

    0.1 mole of H₂SO₄ = 0.2 mole of H⁺
    Mole = no. of H⁺/Avogadro’s constant

    No. of H⁺ = Mole * Avogadro’s constant
    = 0.2 * 6.0*10²³
    = 1.2*10²³ ions

    (4biv)
    (i) Dative bonding
    (ii) Hydrogen bonding

    (4bv)
    (i) BRASS:
    Constituent: Copper and zinc.
    Use: Brass is used in the production of musical instruments decorative items and plumbing fixtures.

    (ii) BRONZE:
    Constituent: Copper and tin.
    Use: Bronze is used in the production of statues coins and various machinery.

     

    (5ai)
    A base is a substance which when disolve produce hydroxyl ion (OH⁻) as the only negative ion

    (5aii)
    (i) K₂O
    (ii) MgO

    (5aiii)
    (i) it is used in printing inks and dyes
    (ii) it is used in making photographic chemicals

    (5aiv)
    Aliphatic does not have good odour while an aromatic hydrocarbon has

    (5av)
    M.m of XCl₃=10-8+(35-5*3)
    =10.8+106.5
    =117.3
    Vapour density =117.3/2=58.65

    (5bi)
    (i) Temperature
    (ii) concentration
    (iii) surface area

    (5bii)
    The law states that energy can neither be created nor destroyed in and isolated system.

    (5biii)
    (i) burning of wood
    (ii) neutralization reaction

    (5c)

     

    (6)
    Coming

    Now Loading…94.5%

     

    We want to hear from you concerning the NECO Chemistry Questions and Answers 2023, kindly use the comment section below to get to us.

    Sponsored Links
    Share. Facebook Twitter WhatsApp Telegram Pinterest LinkedIn Tumblr Email
    Previous ArticleNECO Biology Questions and Answers 2023 (100% Sure) Theory & Obj Solution
    Next Article NECO Languages (Igbo, Yoruba, Hausa) Questions and Answers 2023 (100% Sure) Theory & Obj Solution

    Related Posts

    Grange School Recruitment 2023/2024 Jobs Vacancies Application Form (7 Positions)

    Education

    Nile University of Nigeria Recruitment 2023, Job Vacancies & Application Form (Over 240 Positions)

    Education
    Wellspring College Recruitment 2023/2024

    Wellspring College Recruitment 2023/2024, Job Vacancies & Application Form (4 Positions)

    Education
    Modibbo Adama University Recruitment 2023/2024

    Modibbo Adama University Recruitment 2023/2024, Job Vacancies & Application Form (3 Positions)

    Education
    Bauchi State University Recruitment 2023/2024

    Bauchi State University Recruitment 2023/2024, Job Vacancies & Application Form (3 Positions)

    Education
    St. Mary Dedication British International High Schools Recruitment 2023/2024

    St. Mary Dedication British International High Schools Recruitment 2023/2024, Job vacancies & Application Form (3 Positions)

    Education
    Add A Comment

    Comments are closed.

    Latest Jobs In Nigeria

    Dangote Recruitment 2023/2024, Job Vacancies & Application Form (27 Positions)

    September 14, 2023

    NECO Further maths Questions and Answers 2023 (100% Sure) human and regional Solution

    August 9, 2023

    NIFOR Recruitment 2023/2024 Application Form & Requirements | How To Apply

    September 3, 2023

    JAMB Questions and Answers 2023 (100% Sure) Verified Objective Answers

    September 3, 2023

    TotalEnergies Recruitment 2023, Careers & Job Application Portal (8 Positions)

    September 3, 2023
    Categories
    • Aviation
    • Banking
    • Canada
    • Consultancy
    • Education
    • energy
    • Engineering
    • Finance
    • Government
    • Hospitality
    • Insurance
    • International
    • IT
    • JAMB
    • jobs
    • Jobs Near Me
    • Manufacturing
    • NECO
    • NGO Jobs In Nigeria
    • NYSC
    • Oil & Gas
    • Scholarship
    • Technology
    • Universities in Canada
    • WAEC
    Subscribe to Blog via Email

    Enter your email address to subscribe to this blog and receive notifications of new posts by email.

    Facebook Twitter Instagram LinkedIn Telegram
    • Home
    • Privacy Policy
    • About Us
    • Contact Us
    • Subscribe for Latest Jobs Update
    © 2023 Joberplanet.com - All rights reserved

    Type above and press Enter to search. Press Esc to cancel.