NECO Chemistry Questions and Answers (Objective and Theory) 2022
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NECO Chemistry Questions and Answers (Objective and Theory) 2022

by Iweham
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In this post we shall be sharing with you FREE Chemistry Questions and Answers (Objective and Theory) 2022 for today’s exam July 25, 2022.


Chemistry Questions and Answers (Objective and Theory) 2022 is now released for July/August 2022.

NECO Chemistry Questions are provided to aid you perform brilliantly in your examination.

The National Examinations Council is an examination board established by law to determine the examinations required in the public interest in the English-speaking in Nigeria, to conduct the examinations, and award certificates comparable to those of equivalent examining authorities internationally.

NECO Chemistry Questions and Answers (Objective and Theory) 2022

NECO Chemistry Questions and Answers (Objective)


NECO Chemistry Questions and Answers (Theory)


(i) KAl(SO?)?. 12H?O
(ii) Na?SO?

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

Air in gaseous form is first passed through caustic soda to remove CO?. 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.

(i) It is used for combustion
(ii) It is used for artificial respiration

This is because room temperature is warmer

(i) Methyl orange
(ii) Phenophthalein
An ion is an atom or molecule which has a net electric charge due to the loss or gain of one or more electrons.
HCl gas doesn’t contain ions
(i) Noble gases: Neon, Helium
(ii) Halogens: Iodine, Fluorine
(iii) Alkaline earth metals: Calcium, Magnesium
Halogens attain stable octet configuration by accepting an electron from donors Group I elements.
A sol is a colloid where solid particles are dispersed in liquid medium.

(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.


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.

RO?/RCH? = ?(MCH?/MO?)
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.

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1 comment

Bill Adam jr. July 29, 2022 - 8:08 pm

Your Comment Is oky


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