2022/2023 WAEC/NECO Answers: 2022 Neco Gce. Chemistry practical 1



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LITERATURE-OBJ

1CBBAABBBCD

11BACCCDDCDB

21CACAAABABB

31BAAAABCAAC

41CAABDCBACA

This is actually the 2018 Neco Gce. Chemistry practical 1Answers as questions sent to our subscribers on WHATSAPP, if you are looking for 2022 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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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 Sun 22nd 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.