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NECO GCE Chemistry Practical 2018 Alternative to Questions and Answers
NECO GCE Chemistry Practical 2018 Alternative Questions and Answers
NECO GCE Chemistry Practical 2018 Alternative Questions and Answers, the National Examinations Council (also known as NECO) is an examination body in Nigeria that conducts the Senior Secondary Certificate Examination and the General Certificate in Education. NECO was created by former Head of State Abdulsalami Abubakar in April 1999. It was the first Federal organization to offer subsidized registration to academic candidates in Nigeria.
NECO GCE Chemistry Practical 2018 Alternative Questions and Answers
1ai)
Methyl Orange
Reason:- Titration of strong acid against base
1aii)Yellow
1aiii)Hydrochloricacid
1aiv)2HCL(aq)+ x2Co3 -> 2 x CLaq + H20(aq) + CO2(g)
1b)
Molar mass of HcL = 1+35.5
=36.5gmol^-1
Con of A is moldm^-3 =
Con of A of gdm^3/molar mass in gdm^3
=7.30gdm^-3/36.5gmol^-1
=0.200moldm^-3
1bii)
using CAVA/CBVB = a/b
CA = 0.200mol/dm^3
VA = 26.20cm^3
Cb = ?
VB = 25.0cm^3
a = 2mols
b = 1mol
0.200mol/dm^3 x 26.2cm^3/Cb x 25.0cm^3
= 2mols/1mol
Cb = 0.200×26.20×1/25.0×1
Cb = 5.24/25.0mol/dm^3
Cb = 0.2096mol/dm^3
1biii)
Conc. of B in gdm-3/Conc. of B in mol/dm-3
=10.6gdm-3/0.148 gdm-3
=101.15g
=101gmol-1
2ai)
INFERENCE:
Sample X is a soluble salt
2aii)
OBSERVATION:
A gas is evolved. The gas turns red moist litmus blue.
It forms white fumed when NaOH solution was added was added
INFERENCE:
Alkaline gas
2aiii)
INFERENCE:
CO3 gas is CO3^2-
2aiv)
INFERENCE:
The solution is alkaline
3a)
i)NH4CL and AgNo3
ii)ZnCo3
iii)Fes
iv)AgNo3
v)NH4Cl
3b)
– Burrette
– Reshort Hand
– Solution/Acid
– Conical Flask
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