I Will Send you the Correct 2021 Neco Chemistry Practical Questions and Answers, Neco 2021 Chemistry Practical Runs, Neco 2021 Chemistry Practical Expo, Neco 2021 Chemistry Practical Answers with Objective and Essay/Theory Exactly 5 hours Before the Exam. Neco 2021 Chemistry Practical Obj and Essay Questions & Answers
Table of Contents
Wednesday 14th July 2021
Paper I: Practical – Chemistry 10:00am – 12:00noon
(1biii) Conc of B in g/dm³=? Molar mass of B , NaOH=23+16+1=40g/mol From; conc(g/dm³)=conc(mol/dm³)*molar mass =0.1*40 =4.0g/dm³
(1biv) Mass of salt formed =? Recall mole of NaHSO⁴=? From; mole =con(mol/dm³)*vol(cm³)/1000
Mole=0.106*23.50/1000 Mole=0.0025mol of NaHSO⁴
By proportion 1mol of NaHSO⁴ produce 1mol of Na²SO⁴ 0.0025mol of NaHSO⁴ will produce X mol of Na²SO⁴ X=0.0025*1=0.0025mol of NaSO⁴ Molar mass of Na²SO⁴=(23*2) + 32 + (16*4) =46+32+64 =142g/mol
Recall; mole =mole/molar mass Mass =mole * molar mass Mass =0.0025*142 Mass =0.36g of Na²SO⁴ ====================================
(2a) TEST C + 5cm³ of distilled water
OBSERVATION It dissolve completely
INTERFERENCE C is a soluble salt
(2bi) TEST Solution + NaOH + Heat
OBSERVATION Effervescence occurs in which a colourless gas with pungent smell and turns red litmus paper to blue is given off.
INFERENCES NH³ gas from NH⁴+ is present
(2bii) TEST Stirring rod of HCL + gas given off
OBSERVATION a gas which gives a pop sound is given off
INFERENCES H² is present
(2ci) TEST Solution C + drops of BaCL²
OBSERVATION a white precipitate is formed
INFERENCES CO²^-3, SO²^-4, SO²^-3, May be present.
(2cii) TEST Solution in C(i) + dil HCL
OBSERVATION the white precipitate dissolve is dil HCL and effervescence occurs in which a colourless and odourless gas which turns blue litmus red and lime water milky is given off
INTERFERENCE CO² gas from CO²^3- confirmed ====================================
(3a) (i)Ca²+ (ii)Pb²+
(3bi) concentrated acid can be defined as an acid formed when a large quantity of an acid dissolve in a small or little volume of water.
(3bii) A strong acid is defined as a type of acid that ionize completely in a solution
(3c) Activated charcoal is used as an adsorbent material
(3d) (i)Reddish – Brown (ii) I – red, II – brown. ====================================
Completed!. Promise Fulfilled.
Neco 2021 Chemistry Practical Questions and Answers
We are pleased to inform all Neco students sitting for the 2021 Neco Chemistry Practical Exam that we have the complete Neco 2021 Chemistry Practical Expo with Questions Paper for May/June Neco Examination.
Did you know a good Neco result is your one ticket to admission to any University or Polytechnic of your choice? If you’re directed to this website pls subscribe now and smile while you write your exam.
How to Subscribe for Neco 2021 Chemistry Practical Answers.
Choose from the below subscription price list that best suits you, then send the exact amount as Mtn Recharge Card to us on 07062154881