NECO GCE Chemistry Practical Alternative to Questions and Answers

NECO GCE Chemistry Practical Alternative to Questions and Answers

Examportal still remain your number one past questions and answer, the National Examinations Council (NECO) is a body that conducts examination the Senior Secondary Certificate Examination and the General Certificate in Education.

In April 1999 the  former Head of State Abdulsalami Abubakar created NECO, It is the first Federal organization to offer subsidized registration to academic candidates in Nigeria.

NECO GCE Chemistry Practical 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

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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

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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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