2022/2023 WAEC/NECO Answers: 2022 neco Chemistry practical answers



+234 8108515604 +234 8138274394

Notice
Please send all daily subscription as text message and not on WhatsApp. Always note that if you really want to do well in this exam, daily subscription is never a good option because you will always be disappointed because of delay in response due to much number of chats. All our payment are now strictly on MTN airtime.. Also note that Our 2022 WAEC Midnight Answers Subscription ends on Mon 30th May 2022. Note: we don't accept calls. Please, we beg you in the name of God, do all your daily subscriptions AT LEAST a day before the exam, we may not have time to attend to you for daily subscriptions on the exam day. This is examplaza.com, we source other websites.
ID 90

Thursday 13th June


 Paper III & II: Objective & Essay Government 2hrs 40mins 2:00pm 4:40pm


Government OBJ:
1-10: BECCACEDCB
11-20: CEBDDEABCC
21-30: DBAEEAEDAA
31-40: CACBAEDBAD
41-50: CCECCADCCB
51-60: BAACBDBBAA


This is actually the 2019 neco Chemistry practical answers Answers as questions sent to our subscribers on WHATSAPP, if you are looking for 2022 WAEC/NECO Answers midnight before the exam, try contacting us.

2022 WAEC Expo: The best website and whatsapp group for 2022 waec EXPO

Refresh this page in every 5 minutes starting from 3 hours to the exam


M
ake sure you use your school titre value

For example, if your school uses 23.50

Our own solution centre may use 24.00

Pls don't be confused, just make adjustment from the beginning where you will need to find the *VOLUME. OF ACID USED(CA)*



EXAMPLES FOR 22.50cm³

Volume. Of acid used= 1st + 2nd + 3rd/3

=24.00+24.00+24.00 / 3


= 72/3

=24 molperdm³


VOLUME. OF ACID USE for 25.00


VA= 25.00+25.00+25.00 DIVIDED BY 3

=75/3

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

(1)
The volume or pipette used 25.00cm³

In a tabular form
Titrations     |rough |1st|2nd|3rd|
Final reading  |21.00|41.30|20.40|40.90
Initial reading|0.00|21.00|0.00|20.40
Vol of A used  |21.00|20.30|20.40|20.50

(1ai)
Average volume of A = 20.30+20.40+20.50/3
=61.2/3
=20.40cm³

(1aii)
H2X(aq) + 2NaOH(aq)-->Na2X(aq) + 2H2O(l)

(1bi)
Mass conc. of B = 1g/250cm³
= 1g/0.25dm³ = 4g/dm³
Using :
Molar conc. = mass conc./molar mass
= 4/(23+16+1) = 4/40 = 0.1mol/dm³

(1bii)
Using CAVA/CBVB = nA/nB
CA = CBVBnA/VAnB
CA = 0.1×25×1/20.4×2
Concentration of A = 0.06127mol/dm³

1C

(i)it might contain traces of impurities which must be removed before being weighed
(ii)it is hygroscopic which readily absorb moisture from atmosphere

==========================================
NO2

1st line:|test|:Xn +distilled water,|observat
ion|:Xn dissolves in distilled water,|inference|:Xn is a soluble salt
= = = = = = = = = == = = = =
2nd line:|test|:1st portion+NAOH in drops and in excess,|observation|:pale blue ppt,|inference|:CU2+
= = = = = = = = == = = == =
3rd line:|test|:2nd portion+NH3 in drop and in excess,|observation|:deep blue ppt,|inference|
:CU2+
= == = = = = = == == = = = =
4th line:|test|3rd portion+BACL2,|
observation|:white ppt,|inference|
:SO42-,SO32-,CO32-,CL-
= = = = = = === = == = = == =
5th line:|test|:+ dil HCL,|observation|:insoluble in HCL,|Inference|:SO42-

Still the same


(2)
FILL IN THE TABLE:

(2i)
OBSERVATION:
Solution turns blue

INFERENCE:
Copper salt suspected.

(2ii)
OBSERVATION:
Blue gelatinous precipitate

Insoluble in excess NaOH

INFERENCE:
Cu²+ suspected

Cu²+ Confirmed

(2iii)
OBSERVATION:
Blue gelatinous precipitate

Soluble in excess NH³

INFERENCE:
Cu²+ Suspected

Cu²+ Confirmed

(2iv)
OBSERVATION:
White precipitate

INFERENCE:
SO4²- Suspected

(2v)
OBSERVATION:
Precipitate insoluble in excess

INFERENCE:
SO4²- confirmed

==≠=============≠===================

(3ai)
phenolphthalein

(3aii)
I. Pink
ll. Colourless

(3aiii)
(i)To give a sharp change in colour at the end of the acid base reaction

(3aiv)
(i)the burette must be rinsed with the acid or allow it to drain after rinsing with distilled water
(ii)Air bubble must not be allowed in the burette

(3av)
Neutralization reaction

(3bi)
I. Hofmann voltameter.
II. Kipp's apparatus

(3bii)

Because silver nitrate is photosensitive (i.e.sensitive to light) Therefore,if the silver nitrate is left in sunlight or any bright light, it breaks down (hydrolyses) to give black/brown silver oxide and nitric acid.




How do I get 2021 neco Chemistry practical answers BEFORE THE EXAM?
. You can get 2020/2021 Exam answers directly from examplaza.com, visit HERE NOW
Tags:

FAQ

WHATSAPP GROUP: Related Posts

Answers 2022/2023: How do I get 2022 Waec Gce Health Science & Health Education answers hours/night before the exam? Examplaza sends answers night to the exam. Visit examplaza.com


2022/2023 WAEC/NECO Answers: 2022 Waec Gce Health Science & Health Education answers

Answers 2022/2023: How do I get 2022 Waec Gce geography answers hours/night before the exam? Examplaza sends answers night to the exam. Visit examplaza.com


2022/2023 WAEC/NECO Answers: 2022 Waec Gce geography answers

WAEC Financial Acc. Answers 2022: How do I get 2022 Waec accounting answers hours before the exam? Examplaza sends answers night to the exam. Visit examplaza.com


2022 WAEC Accounting Answers: 2022 Waec Financial accounting answers

Answers 2022/2023: How do I get 2022 Waec Gce Physics answers. hours/night before the exam? Examplaza sends answers night to the exam. Visit examplaza.com


2022/2023 WAEC/NECO Answers: 2022 Waec Gce Physics answers.

Answers 2022/2023: How do I get 2022 Waec Gce geography answers hours/night before the exam? Examplaza sends answers night to the exam. Visit examplaza.com


2022/2023 WAEC/NECO Answers: 2022 Waec Gce geography answers

Answers 2022/2023: How do I get WAEC GCE 2022. Chemistry 3 answers hours/night before the exam? Examplaza sends answers night to the exam. Visit examplaza.com


2022/2023 WAEC/NECO Answers: WAEC GCE 2022. Chemistry 3 answers

Answers 2022/2023: How do I get Waec Gce 2022. Lit. In English Answers hours/night before the exam? Examplaza sends answers night to the exam. Visit examplaza.com


2022/2023 WAEC/NECO Answers: Waec Gce 2022. Lit. In English Answers

Answers 2022/2023: How do I get Waec Gce 2022. Government answers hours/night before the exam? Examplaza sends answers night to the exam. Visit examplaza.com


2022/2023 WAEC/NECO Answers: Waec Gce 2022. Government answers

Answers 2022/2023: How do I get 2022 Waec Gce. Agric practical answers hours/night before the exam? Examplaza sends answers night to the exam. Visit examplaza.com


2022/2023 WAEC/NECO Answers: 2022 Waec Gce. Agric practical answers

Answers 2022/2023: How do I get 2022 Waec Gce. Civic Education answers hours/night before the exam? Examplaza sends answers night to the exam. Visit examplaza.com


2022/2023 WAEC/NECO Answers: 2022 Waec Gce. Civic Education answers


Please send all daily subscription as text message and not on WhatsApp. Always note that if you really want to do well in this exam, daily subscription is never a good option because you will always be disappointed because of delay in response due to much number of chats. All our payment are now strictly on MTN airtime.. Also note that Our 2022 WAEC Midnight Answers Subscription ends on Mon 30th May 2022. Note: we don't accept calls. Please, we beg you in the name of God, do all your daily subscriptions AT LEAST a day before the exam, we may not have time to attend to you for daily subscriptions on the exam day. This is examplaza.com, we source other websites.