Join Our BBM Channel For Hot Updates Click Here

Starbaze

HOME | WAEC | NECO | NABTEB | JAMB| WAEC GCE | NECO GCE | NABTEB GCE | OTHERS

|

NECO GCE 2018 Chemistry Practical Answer– Nov/Dec Expo

 

NECO GCE 2018 Chemistry ANSWER

Verified NECO GCE 2018 Chemistry practical ANSWER

Start to subscribe for English answer now. English will not be post here free of charge. Those that subscribe will get answer 6 hours before exam start. Our subscribers can confirmed this.

Direct Mobile = N1,000 MTN CARD

Password/Pin Link = N700


Send your card to 08084110925

100% GUARANTEED. NO FREE ANSWER FOR ENGLISH

(1)
Indicator used Methyl Orange
Volume of burette = 50.00cm3
Volume of pipette = 25.00cm
(i)
TABULATE:
Titration| 1 | 2 | 3|
First Burette readings (cms) | 21.80 | 21.50 | 24.00
Initial burette reading (cm3) | 01.30 | 01.00 | 03.50
Volume of acid used (cm) | 20.50 | 20.50 | 20. 50

(ii) average volume of A used = 1st + 2nd + 3rd/3
= 20.50 + 20.50 + 20.50/ 3
= 20.50cm3
(iii) Con in g/dm3 = 4.0g/dm3
Con + B moldm-3 = Conc in g/dm-3/molar mass
= 4/40 = 0.1moldm-3
Molar mass of NaOH ==> 23 + 1c + 1
= 40g/mole
Conc of B is 0.1moldm-3

(biii)
Concordant readings are the readings within 0.20cm3 of each other
(iv)
Methy orange is used because te titration is between or involving strong acid and strong base
(v)
– I ensure I took the measure below menisons
– I avoided shaking of pipette while the reading is going on
(vi)
NaOH is soapy to touch

(1ci)
(i) A is a mono base acid since the mole is 1
A could be HCL, HNO3
(cii)
Equation of the reaction is NaOH +2HCL ==> NaCl + H2O

(2a)
C is soluble salt

(2ai)
– Zn^2+ or Al^3+ present
– Zn^2+ or Al^3+ present

(2aii)
– Zn^2+ or Al^3+ present
– Zn^2+ is confrim

(2bi)
SO3^2- or SO4^2-present

(2bii)
SO3^2- present

(2biii)
SO3^2- confrim

(2c)
ZnSO3

(3a)
(i) Co2 can be removed by adding canstic soda i.e sodium hydroxide
(ii) purity of water can be determined through it boiling point as it is noted that pure water boils at 100oc
(iii)
AgN03 produce brown fumes as NO2 is produced on heating as 2AgNO3 (s) ==> 2Ag(s) + O2(g) 2NO2(g)
(iv)
It changes the litmus paper red as the hydrogen ion in the wet litmus forms as acid on exposure to the litmus paper.

(3b)
(i) it don’t like drowing
(ii) it cannot be collected by displacement of air because nitrogen constitutes to large percentage of the air constitutes (78%)
(iii) HCL gas or ammonia gas


Avoid Scammers, Always subscribe to Starbaze.com to get Verified NECO GCE Chemistry practical Answer.

GOODLUCK!!!

Click Here To Comment

Trending Posts - Last 3 Days

Sorry. No data so far.

THIS POST:By: in NECO GCE4:54 pm
We would very much Appreciate your Comments on This Post below. Comments Appear after Admin Moderation!
 

0 Responses

Leave a Reply

|