2024 NECO CHEMISTRY: 2024 NECO CHEMISTRY PRACTICAL ANSWERS (4703)

loading...

VERY IMPORTANT INFORMATION FOR NUMBER 1!!!
PLEASE REMEMBER TO USE YOUR'S SCHOOL'S AVERAGE TITRE VALUE(AVERAGE VOLUME OF ACID). WE USED 23.00cm3, TRY TO KNOW YOUR SCHOOL'S AVERAGE TITRE VALUE. ASK YOUR CHEMISTRY TEACHER. THEN, ANYWHERE YOU SEE 23.00cm3 IN MY CALCULATION, PUT YOUR SCHOOL'S OWN AND RE-CALCULATE. THIS IS VERY IMPORTANT!!!

1biv corrected

 1bv Added.

Refresh always... 

Welcome to official 2024 Chemistry NECO answer page. We provide 2024 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 2024. NECO Chems Expo for Theory & Objective (OBJ) PDF: verified & correct expo Solved Solutions, 2024 NECO CHEMISTRY PRACTICAL ANSWERS. 2024 NECO EXAM Chemistry Questions and Answers

Questions Students ask about 2024 NECO CHEMISTRY: 2024 NECO CHEMISTRY PRACTICAL ANSWERS (4703)

• How to get 2024 Chemistry NECO QUESTION AND ANSWERS before the exam? To get 2024 NECO CHEMISTRY PRACTICAL ANSWERS midnight before the exam, all you need to do is to visit expocode.net with the pin sent to you by the admin and login. With the pin, you can have a full access to 2024 NECO CHEMISTRY PRACTICAL ANSWERS

---

• When do I get Verified 2024 Chemistry NECO QUESTION AND ANSWERS? You will get 2024 NECO CHEMISTRY PRACTICAL ANSWERS a night to the exam because Chemistry is an important subject.

---

• After using 2024 Chemistry NECO ANSWERS, How many am I assured of in Chemistry? You will score between 7As - 9As in Chemistry if you write verbatim 2024 NECO CHEMISTRY PRACTICAL ANSWERS.

---

• How verified is your 2024 Chemistry NECO ANSWERS? Our 2024 NECO CHEMISTRY PRACTICAL ANSWERS is 100% verified and legit and it is worthy to be trusted because it from expocode.net which is the most trusted website for exam runs in Nigeria.

---

• Where do I get 2024 Chemistry NECO QUESTION AND ANSWERS? You can get 2024 NECO CHEMISTRY PRACTICAL ANSWERS only from expocode.net

---

• Is the answers on this page actually the main 2024 NECO CHEMISTRY PRACTICAL ANSWERS? No, This is 2020 NECO CHEMISTRY PRACTICAL ANSWERS, to get 2024 NECO CHEMISTRY PRACTICAL ANSWERS, you need to subscribe with us by texting or WhatsApping us.

---

• How do I subscribe for 2024 Chemistry NECO Questions & ANSWERS? To subscribe for 2024 Chemistry NECO Questions & ANSWERS, Message 08069228752 stating that you need 2024 Chemistry NECO Questions & ANSWERS a day to the exam.

(1)
Indicator used is methyl orange.
Volume of pipette used is 25cm³

Tabulate.
Titration; Rough|1st|2nd|3rd|

Final burette reading cm³|23.50|23.00|23.00|33.00|

Initial burette reading cm³| 00|0.00|0.00|10.00|

Volume of acid used(cm³) |23.50|23.00|23.00|23.00|

Average volume of A used = 23.00+23.00+23.00/3 =23.00cm³

Equation for the reaction
X²Co³(aq)+2HCl(aq)---->2XCl(aq)+H²O(s)+Cl(s)

(1i)
Concentration of A in moldm³ =concentration in gldm³.

3.6g of A =500cm²
Xg of A will be = 10000³
Xg=3.65*1000/500 =36.5/5 =7.3gldm³

Molar Mass of A HCl=1+35.5=36.5
Concentration of A =7.3gldm³/36.5gldm³
=0.20moldm³

(1ii)
Concentration of B in moldm³
concentration of A in moldm³ CA=0.20
Volume of used VA=23.00
Concentration of B in moldm³ CB=?
Volume of B used VB= 25.00

CAVA/CBVB = n(A)/n(B) =2/1
0.20*23.00/CB*25.00=2/1

2*CB*25.00=0.20*23.00*1
CB=0.20*23.00/50
Cb=46/50=0.092moldm-³

(1iii)
Molar mass of B in glmol
Concentration of B(moldm-³)= conc gldm³/molar mass
0.092=10.60gldm³/molar mass
0.092 * molar mass =10.60gldm³
Molar mass =10.60gldm³/0.092
=115.2glmd

(1biv)
Relative atomic mass of X in X²CO³
X²+12+3(16)=115.2
2x+12+48=115.2
2x+60=115.2
2x=115.2÷60
2x=55.2
x=55.2/2=27.6

(1bv)
No of moles of X2CO3 = molarity × volume
= 0.092 × 25
= 2.3moles

Mole ratio of X2CO3 to CO2 is 1:1
Therefore, No of moles of CO2 released = 2.3moles
Volume of CO2 released = 2.3 × 22.4
=51.52dm³
 

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

(2ai)
Tabulate:
TEST: C + 5cm³ of distilled water and shake thoroughly. Divide the solutions into three portions.

OBSERVATION: A pale green solution results

INFERENCE: Salt is soluble

(2aii)
TEST: To the first portion add NaOH solution in drys

OBSERVATION: Dark green gelatinous was formed

INFERENCE: Fe²+ present

(2aiii)
TEST: then in excess

OBSERVATION: Precipitate is insoluble

INFERENCE: Fe²+ present

(2aiv)
TEST: To the second portion add K3Fe(CN)6 solution

OBSERVATION: A dark blue precipitate formed

INFERENCE: Fe²+ confirmed

(2bi)
TEST: To the third portion add AgNO³ solution

OBSERVATION: White Precipitate formed

INFERENCE: SO4²- , CL- CO²- present

(2bii)
TEST: To the results obtained in add dilute HNO3 in drops , then excess

OBSERVATION: White Precipitate is insoluble

INFERENCE: CL- present

(2biii)
TEST: To the results obtained in add NH3 solution

OBSERVATION: White Precipitate dissolves

INFERENCE: CL- Confirmed

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

(3ai)
Filtration

(3aii)
Diagram

(3bi)
I. Methyl Orange
II. Methyl orange
III. Phenolphthalein

(3bii)
A white Precipitate is observed. Effervescence occurs a gas is evolved which change lime water milky.

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

loading...

Welcome to official 2024 Chemistry NECO answer page. We provide 2024 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 (14 years)

Founder: Examcode

Headquarters: Borno, Nigeria

Official Website: https://expocode.net/

Official Contact: +2348069228752