Neco 2020 resheduled Chemistry Question and Answers Expo

neco agricultural science questions and answers 2021

 


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Neco GCE 2021 chemistry Practical Question and Answers Now Posted


2020 NECO GCE  & RESCHEDULED CHEMISTRY VERIFIED ANSWERS
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1 – 2

1ai)
-inconsidtent reading of the burette to the nearest whole number
-consistently reading burette to one decimal number
-arithmetic error
-lack of unit
-non concordant values

1aii)
Average Titre=24.55+22.60+22.50/3
=69.65cm³/3
=23.216cm³

1aiii)
Na²Co3+2HCL===>2Nacl+H20+Co2

1bi)
CA=0.0050moldm-³,Na=2
CB=? VB=25cm³, Nb=1
VA=23.21cm³

CAVA= NA
===== ===
CBVB =NB

0.050X23.21=2
CBX25.00 1

CBX2X25.00=0.0050X23.21X1

CB=1.1605/50 moldm³
CB=0.023moldm³

1aiv)
Methyl Orange.

1av)
It’s a titration Between strong acid and Strong Base

1avi)
Pink

===================================

3 – 4

(3ai)
(i)To prevent sunlight Ray’s from affecting the solutions

(ii)To prevent the sucking back of water into the hot flask.

(iii) Because it is a component of glass

(iv)NaOH + CO² —> NaHCO³

(3bi)
(i)Heat iodine crystal
(ii)NH⁴Cl

(3bii)
(i)Stationary phase
(ii)Morning phase

Completed


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