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In this post are researched regularly repeated NECO 2018 June/July Chemistry Objective and theory Answers/Verified Chemistry Objective and theory Questions & Answer June/July 2018 . Get them in your finger tips and you are sure of a high grade in this exams NECO 2018 June/July Chemistry Objective and theory Answers/Verified Chemistry Objective and theory Questions & Answer June/July 2018..
WHAT NECO STANDS FOR
The National Examinations Council – NECO is a Nigerian Government owned examination body that conducts the Senior Secondary Certificate Examination and the General Certificate in Education in June/July and December/January respectively. These are entry qualification examinations for higher education institutions in Nigeria.
NECO was created in April 1999 with a mandated to take over the responsibilities of the National Board of Education Measurement (NBEM).
NECO therefore conducts Senior Secondary Certificate Examination (internal and external), Junior Secondary Certificate Examination (JSCE) for Federal Unity College and other Federal secondary schools and Private secondary schools, and National Common Entrance Examination for primary 6 pupils interested in admission into Federal Unity Colleges.
The Senior Secondary Certificate Examinations (internal and external) are entry qualification examinations for higher education institutions in Nigeria. NECO 2018 June/July Chemistry Objective and theory Answers/Verified Chemistry Objective and theory Questions & Answer June/July 2018 is relevant here.
NECO 2018 June/July Chemistry Objective and theory Answers/Verified Chemistry Objective and theory Questions & Answer June/July 2018
Table of Contents
NECO RESULTS & HIGHER SCHOOL ADMISSION
As you know, no University, Polytechnic, or college of education in Nigeria would admit you into any of their courses without a good grade in any of these examinations. That is why over three million candidates register and take these subject exams annually.
Consequently, in NECO 2018 June/July Chemistry Objective and theory Answers/Verified Chemistry Objective and theory Questions & Answer June/July 2018, our goal is to help you achieve this your life dream. Listed here are Chemistry, questions and answers relevant to 2018 June/July Chemistry Subject examination.
NECO 2018 June/July Chemistry Objective and theory Answers/Verified Chemistry Objective and theory Questions & Answer June/July 2018
RESEARCHED AND VERIFIED NECO REGULARLY REPEATED QUESTIONS & ANSWERS
CHEMISTRY OBJ :
1-10 DCBBCBBEDC
11-20 CADECEBBDC
21-30 EEBABDADBE
31-40 AECCACDDDC
41-50 DABABCBBCA
51-60 CBBAABCADE
CHEMISTRY THEORY QUESTIONS
1ai)
A mixture contains two or more constituents which can easily be seperated by physical methods
1aii)
magnesium trioxonitrate(v) = Mg(NO3)2
molar mass of Mg(NO3)2
=(1*24) + 2 (14*1 + 16*3)
=24 + 2 (14 + 48)
=24 + 28 + 96 = 148g/mol
% of nitrogen = 2*24*100/148
% of nitrogen = 48*100/148
% of nitrogen = 4800/148
% of nitrogen = 32.43%
1aiii)
i)calcium oxide (CaO)
ii)calcium choride (CaCl2)
1bi)
CnH2n+1OH
1bii)
hydrolysation
1biii)
i)displacement reaction
ii)double decomposition reaction
iii)decomposition reaction
iv)catalytic reaction
v)reversible reaction
1biv)
i)endothermic heat change
ii)exothermic heat change
1ci)
i)methyl orange
ii)phenolphthalein
iii)litmus
1cii)
NH4Cl+Ca(OH)2—–>CaCl2+2NH3+2H2O
1ciii)
it is collected by upward delivery
1civ)
mass of gas = 1.58*22.4 = 35.392
vapour density = 35.392/1
relative molecular mass= V . D * 2
=35.392*2
relative molecular mass= 70.784
==================================
5ai)
i)carbon monoxide and hydrogen
ii)carbon monoxide,carbon dioxide,hydrogen and nitrogen
5aii)
i)colloids is an intermediate between true solution and a suspension
ii)condensation is the process by which water vapour in the air is changed to liquid water
5bi)
CaC03+2HCl—–>CaCl2+H2O+CO2
5bii)
i)it is used in fire extinguishers
ii)it is used in the manufacturing of mineral water
iii)carbon(iv)oxide is used as a coolant in nuclear reactors
5biii)
i)Cr2O7^-2
=2Cr + C-2*7) = -2
2Cr – 14 = -2
2Cr = -2 + 14
2Cr/2 = 12/2
Cr = 6
ii)Cr2{SO4}3
2Cr + 3 (-2*1 + -2*4) = 0
2Cr + 3 (-2 – 8) = 0
2Cr + 3 (-10) = 0
2Cr – 30 = 0
2Cr/2 = 30/2
Cr = 15
5ci)
vulcanization is a chemical process of converting netural rubber or related polymers into more durable materials through the addition of sulphur or other equivalent curatives or accelerators
5cii)
Time Taken(t) for 6.35g of copper(ii)tetraoxosulphate
solution
Cu^2^+ + 2c ——->Cu
Q = 2*63.5*95600
Q = 12255500
Q = 1t
12255500/10 = 10*t/10
t = 1225550/60 = 204258.3
5ciii)
Latex
NECO 2018 June/July Chemistry Objective and theory Answers/Verified Chemistry Objective and theory Questions & Answer June/July 2018
4ai)
electrolytic cell is a cell that consist of a container of electrolyte with two electrodes connected to a suitable direct current supply
4aii)
i)daniel cell
ii)Leclanché cell
4aiii)
i)copper
ii)tin
4aiv)
action of dilute acide on zinc
4av)
Zn+2HCl——>ZnCl+H2
4bi)
i)dinitrogen(i)oxide(N2O)
ii)nitrogen(v)oxide(N2O5)
iii)nitrogen(iv)oxide(NO2)
4bii)
charle’s law states that the volume of a fixed mass of gas varies directly with the absolute(kelvin)temperature provided the pressure remains constant.
4biii)
P1 V1 = P2 V2
given that
P1 = 900mmHg
P2 = 750mmHg
V1 = 300cm^3
V2 = ?
V2 = P1V1/P2
V2 = 900*300/750
V2 = 270000/750
V2 = 360cm^3
4biv)
% composition carbon
= 12/(12*6) + (1*6) *100%
= 12/72+6 *100
= 12/78 * 100% = 1200/78%
%composition of carbon = 15.38%
4c)
TABULATE
-THERMOPLASTS-
i)it melts when heat is applied to it
ii)highly recycled
-THERMOSETS-
i)does not melt when heat is applied
ii)cannot be recycled
==================================
2ai)
ionization energy deals with electron loss while electron loss while electron afinity deals with electron gain
2aii)
i)they are used to dry gases
ii)they are used to recover valuable vapours from industrial effluents and refine petroleum
2bi)
TABULATE
-RHOMBIC SULPHUR-
i)bright yellow in colour
ii)it is octohedral in shape
-MONOCLINIC SULPHUR-
i)amber in colour
ii)it is needle like in shape
2bii)
oxygen = 60%
sodium = 40%
oxygen 60/16
3.75/1.74 = 2
sodium 40/23
1.74/1.74 = 1
the emperical formula is NaO2
2biii)
sodium(iv)oxide
2ci)
i)x is hydrophobic region
ii)y is hydrophilic religion
2cii)
i)for laundry purpose
ii)for fuel
2ciii)
i)the distance of outermost electron from the nucleus
ii)the size of the positive nuclear charge
iii)the screening effect of inner electrons
2civ)
period law states that the properties of the elements are a period function of their atomic number
2di)
n—pentane—–>n—butane—–>2—methylbutane—2,2—dimethylpropane
2dii)
i)glucose
ii)galactose
READ OTHER NECO 2018 QUESTIONS AND ANSWERS HERE:
EXAM SUCCESS TIPS:
In conclusion, I wish to recommend the following study strategies for you. They are exam success tips, which are better than looking for expo here and there. They are strategies that can help you ensure exam success as well as mastery of the subject.
Start by, setting your goals and manage your time well and ensure you attend your teaching/leason classes regularly. Again, Identify your learning style by developing your study plan which will enable you keep up with reading, thereby, surrounding yourself with learning at all time. Develop effective note-taking techniques. Finally, Create mind maps and get ready for the exams.
Good luck.
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Deacon Anekperechi Nworgu, a seasoned economist who transitioned into a chartered accountant, auditor, tax practitioner, and business consultant, brings with him a wealth of industry expertise spanning over 37 years.
