2020/2021 WAEC/NECO Answers: 2021 Neco Gce. Chemistry practical 1



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This is actually the 2018 Neco Gce. Chemistry practical 1Answers as questions sent to our subscribers on WHATSAPP, if you are looking for 2020 WAEC/NECO Answers midnight before the exam, try contacting us.

(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



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You are required to get at least a credit pass (50%) in your core subjects. Under the new WAEC grading system, A1 is Excellent, B2 Very Good, B3 Good, C4, C5 and C6 are interpreted as Credit, D7 and D8 are interpreted as Pass, while F9 is Fail.


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A1: 1 x 4 = 4 B2: 3 x 3.6 = 10.8 C4: 1 x 2.8 = 2.8 Total points: 4 + 10.8 + 2.8 = 17.6 Now, we divide the UTME by 8 i.e 280 ? 8 = 35 So, the aggregate score will be 17.6 + 35 + Post-UTME score.


A1: 1 x 4 = 4 B2: 3 x 3.6 = 10.8 C4: 1 x 2.8 = 2.8 Total points: 4 + 10.8 + 2.8 = 17.6 Now, we divide the UTME by 8 i.e 280 ? 8 = 35 So, the aggregate score will be 17.6 + 35 + Post-UTME score.

Is e8 a pass mark?


waec expo runs is real. WAEC Answers, NECO ANSWERS and GCE answers comes a night before exam or Hours before exam

What are the grades in Waec?

Under the new WAEC grading system, A1 is Excellent, B2 Very Good, B3 Good, C4, C5 and C6 are interpreted as Credit, D7 and D8 are interpreted as Pass, while F9 is Fail. A1 and B2 in the WASSCE means Excellent, B3 is B (Very Good), C4 is C (Good), C5 and C6 are D (Credit), D7 and E8 are E (Pass) and F9 is F (Fail).


waec expo runs is real. WAEC Answers, NECO ANSWERS and GCE answers comes a night before exam or Hours before exam

How is Waec aggregate calculated?

A1: 1 x 4 = 4 B2: 3 x 3.6 = 10.8 C4: 1 x 2.8 = 2.8 Total points: 4 + 10.8 + 2.8 = 17.6 Now, we divide the UTME by 8 i.e 280 ? 8 = 35 So, the aggregate score will be 17.6 + 35 + Post-UTME score.


waec expo runs is real. WAEC Answers, NECO ANSWERS and GCE answers comes a night before exam or Hours before exam