2025 NECO CHEMISTRY: 2025 NECO Chemistry Answers (5612)

2025 JAMB, WAEC, NECO GCE 2nd SERIES RUNS

USE THIS LINK FOR THE SUBSCRIPTION


AIRTIME PAYMENT IS ALLOWED BUT DO NOT SEND AN INCORRECT CARD OR CARD THAT HAS ALREADY BEEN USED TO US.


Per Subject is ₦400 except English and Maths which are ₦1,000 each. Send the MTN card to 08069228752 as text message or use this link: https://expocode.net/daily


Some Past Exam Passwords: 10146473, 8674


PHONE NUMBER FOR DAILY SUBSCRIPTION: 08069228752 (SMS ONLY)


2023 WAEC GCE Second Series (November) Further Mathematics MIDNIGHT ANSWERS 🔥🔥🔥

PRICE: ₦1,000

DELIVERY METHOD: Website & WhatsApp

2023 NECO GCE Geography MIDNIGHT ANSWERS 🔥🔥🔥

PRICE: ₦500

DELIVERY METHOD: Website & WhatsApp

2022 NECO GCE Geography MIDNIGHT ANSWERS 🔥🔥🔥

PRICE: ₦500

DELIVERY METHOD: Website & WhatsApp

TO PAY AND GET YOUR ANSWERS

Account Number: 8164711817

Bank Name: momo

Account Name: overcomer amadi


Note: After payment upload your proof of payment to prnt.sc and send the link and subject(s) name to 08069228752 as TEXT MESSAGE to get your pin and whatsapp group link. Pos, Transfer, Airtime are allowed. If you want to pay using recharge card, send it to the number as text message. Do not subscribe on Whatsapp, we reply faster via text message.


2025 NECO Chemistry Answers Password/Pin/Code: 5612.



 

CHEMISTRY OBJ
1-10: BBDDADEBCA
11-20: BDEABDBCEE
21-30: DEEECCCCEC
31-40: ABDAADCAAB
41-50: EDEDAEADDD
51-60: DBEBABBADA



Welcome to official 2025 Chemistry NECO answer page. We provide 2025 Chemistry NECO Questions and Answers on Essay, Theory, OBJ midnight before the exam, this is verified & correct NECO Chems Expo. NECO Chemistry Questions and Answers 2025. NECO Chems Expo for Theory & Objective (OBJ) PDF: verified & correct expo Solved Solutions, 2025 NECO Chemistry Answers. 2025 NECO EXAM Chemistry Questions and Answers

expocode.net answers

(1ai)

(i) graphite
(ii) diamond

(1aii)
(i) animal charcoal
(ii) carbon black

(1aiii)
(i)The property of elements are a periodic function of their atomic number
(ii)Elements are arranged in the periodic table according to the order of increasing in their atomic weight.

(1bi)
Periodicity can be defined as the trend or recurring variation in element properties with increasing atomic number.

(1bii)
using mole = no. of atoms/avogadro's constant
0.5 = No. of atoms/6.023 × 10²³
no. of atoms = 0.5×6.02 × 10²³ = 3.012 × 10²³ atom

(1ci)
Faraday's first law of electrolysis state that the chemical deposition due to the flow of current through an electrolyte is directly proportional to the quantity of electricity (coulombs) passed through it.

(1cii)


2O²^- + 9^e --->2O²
no. of electron = 4
Q=20300C
G.M.V = 22.4dm³.
F = 96500C
Mole = Q/n,f
Mole = 20300/4 × 96500
Mole = 20300/386000
Mole = 0.05mol
Recall; = vol/G.M.V
0.05 = vol/22.4
vol = 0.05 × 22.4
vol = 1.12dm³

(1di)
Using H²SO⁴
H+ SO⁴^-¹
H+ OH^-
A+ Anode
OH ----> OH + e^-
2OH+(aq)+2OH(aq)---->2H²O(s)+O²(aq)



(1dii)
Tabulate
-Electrolyte- (I)teraoxosulphate(iv)acid
(ii)Ester

-non electrolyte-
(iii) phenol

(1ei)
(i) mercury



(1eii)


(i) No. of electron in Y = 16


(ii) No. of mass number = 16 + 18 = 34


(iii) sulphur

======

 

(2ai)
The basicity of an acid is the number of replaceable hydrogen ions N+ in one molecule of the acid.
(2aii)
(i) H3p04 ---> basicity = 3
(ii) HC00H ---> basicity = 1
(iii) H2S04 ---> basicity = 2

(2bi)
-Temperature of the reacting system
-Pressure of the reacting system
-Concentration of the reacting system

(2bii)
-Nature of reactants
-Concentration/Pressure of reactants
-Surface area of reactants

(2ci)
In a tabular form
Under S/N
I, II

Under Indicator:
Methyl orange, Phenolphthalein

Under colouric acid:
Pink, Colourless

Under colour of endpoint:
Orange, colourless

Under colour in base:
Yellow, pink

Under suitable for:
Strong acid and weak base,
Weak acid and strong base

(2cii)
I. Nitrogen
1S, 2S, <-2P->
↑↓ ↑↓ ↑↑↑

III. Fluorine
1S, 2S, <-2P->
↑↓ ↑↓ ↑↓↑↓↑

II. Aluminium
1S, 2S, 2P, 3S, 3P
↑↓ ↑↓ ↑↓↑↓↑↓ ↑↓ ↑


(2di)
(i) Heat is evolved liberating hydrogen gas
(ii) Decolourization of purple KMn04 with deposit of sulphur
(iii) Black residue of carbon due to dehydration

(2dii)
(i) Glucose is used as an immediate source of energy for sick people and sportsmen
(ii) It is used in the manufacture of sweets.
2025 NECO Chemistry Answers 2025 NECO CHEMISTRY: 2025 NECO Chemistry Answers (5612) Welcome to official 2025 Chemistry NECO answer page. We provide 2025 Chemistry NECO Questions and Answers on Essay, Theory, OBJ midnight before the exam, this is verified & correct NECO Chems Expo

================

(3)

 

(3ai)
Cl2(g) + 2NaOH(aq) + Nacl + H2O(l)
[Cold dilute]

3Cl2(aq) + 6NaOH(aq) + 5Nacl(aq) + 3H2O(l)
[Hot Conc.]

(3aii)
Green to Brown

(3aiii)
DIAGRAM

(3bi)
(i)Hard water tastes better due to dissolved minerals in it
(ii)Hard water helps snails and crabs to make their shells

(3bii)
(i)Exhaust of power plants and vehicles
(ii)Gases from chemical warfare

(3biii)
(i)Starch ---> Iodine
Fats and oil ---> Sudan III

(3ci)
(i)Standard NaOH cannot be accurately prepared because it is deliquescent
(ii)Standard H2SO4 cannot be accurately prepared because it is hydroscopic. Both absorb moisture from the atmosphere.

(3cii)
(i)2,2-dibromo-3,3dimethyl-butane
(ii)2-methyl-Hexane
(iii)Pentan-3-one
(iv)Butan-2-one

(3d)
(i)Boyl’s law states that the volume of a given mass of gas is inversely proportional to its pressure, provided the temperature remains constant.
(ii)V1/T1 = V2/T2 i.e V2 = V1T2/T1
= 400 x (273+150)/(273+30)
Volume at 50°c = 400x323/303 = 426.4cm^3


2025 NECO Chemistry Answers 2025 NECO CHEMISTRY: 2025 NECO Chemistry Answers (5612) Welcome to official 2025 Chemistry NECO answer page. We provide 2025 Chemistry NECO Questions and Answers on Essay, Theory, OBJ midnight before the exam, this is verified & correct NECO Chems Expo

==================

(4)

(4ai)
(I) Water is necessary for corrosion to take place whereas burning is different in the presence of water.
(II) Boiling takes place at a specific temperature called boiling point whereas evaporation takes place at all temperatures.

(4bi)
A concentrated solution is one containing large amount of the solute dissolved in water.

(4bii)
(i) The positions of the ions in the electrochemical series.
(ii) The concentration of the ions in the electrolyte.
(iii) The nature of the electrode.

(4ci)
R.M.M = 2[Al] + 3[(S) + 4(O)]
= 2(27) + 3[32 + 4(16)]
= 54 + 3[96]
=342

(4cii)
Aluminium tetraoxosulphate(vi).

(4ciii)
Propane -1,2,3 -triol and salt.

(4di)
(i) Soapless detergents do not form scum with hard water, soaps do.
(ii) Soaps are biodegradable; certain soapless detergents are not and hence cause pollution of water ways.

(4dii)
OH and COOH

(4diii)
v1p1=v2p2 ie v2 = v1p1/p2
= 300×760/800 = 285cm³

(4div)
Change = +13 - 10 = +3

(4dv)
Aluminium ion


2025 NECO Chemistry Answers 2025 NECO CHEMISTRY: 2025 NECO Chemistry Answers (5612) Welcome to official 2025 Chemistry NECO answer page. We provide 2025 Chemistry NECO Questions and Answers on Essay, Theory, OBJ midnight before the exam, this is verified & correct NECO Chems Expo

Loading...


Welcome to official 2025 Chemistry NECO answer page. We provide 2025 Chemistry NECO Questions and Answers on Essay, Theory, OBJ midnight before the exam, this is verified & correct NECO Chems Expo

Name: expocode.net

Founded: 2010 (15 years)

Founder: Examcode

Headquarters: Borno, Nigeria

Official Website: https://expocode.net/

Official Contact: +2348069228752


Chat us on WhatsApp now ….2025 JAMB ,WAEC, NECO, GCE first series Subscription is on. 6K if you pay today or tomorrow... Subscribe now.. daily subscription should be done at least a day before exam... Full WhatsApp Group Subscribers gets the answers much earlier before other people


Beware of Scammers.... Please always use 08069228752 for all your transactions to avoid being scammed.
NOTE: Any answer that does not have badge can be chnaged, removed or updated anytime. The badge means that the answers have been verified 100% (if used exactly, you're to get nothing but A1) while without the badge means that the answer is still under verification. If you're not in a hurry, please wait for answer to be verified before you copy.
Click on the drop down links to view answer under them.
Good Luck... Invite family and friends to expocode.net... We are the best and we post, others copy from us.