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: BAACBDBBAAThis is actually the 2019 neco Chemistry practical answers Answers as questions sent to our subscribers on WHATSAPP, if you are looking for 2020 WAEC/NECO Answers midnight before the exam, try contacting us.
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Make 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
= = = = = = = = == = = == =
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.
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