2021 NECO GCE Chemistry (Essay & OBJ) Answers [7th December]

Get Free Live 2021 NECO GCE Chemistry (CHEM) OBJ & THEORY Questions and Answers Free of Charge | NECO Nov/Dec Free CHEMISTRY (Objectives and Theory) Questions and Answers EXPO Room (7th December, 2021).

NECO NOV/DEC 2021 FREE CHEMISTRY (CHEM) QUESTION AND ANSWER ROOM

Tuesday 7th December, 2021
Chemistry Paper III & II (Objective & Essay) 2.00pm – 5.00pm

NECO GCE CHEMISTRY OBJECTIVES (OBJ) ANSWERS 2021:

1-10: EAABCEEDCA
11-20: EABCCBCAED
21-30: BBCBBDDBCA
31-40: DBCECACABA
41-50: CBACDBDCAA
51-60: AACEBDBECE


NECO GCE CHEMISTRY ESSAY (THEORY) ANSWERS 2021:

(3)



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(4)



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(6ai)
(i)Diamond
(ii)Graphite

(6aii)
(i)Diamond is a 3-dimensional octahedral crystal
(ii) Graphite is a 2-dimensional hexagonal crystal

(6aiii)


(6bi)
(i) fats have high melting point
(ii) Oil can be hydrogenated to give fat

(6bii)
(i) Hydrogenation
(ii) Saponification

(6biii)
H H H H
| | | |
H -C - C C C -H
| | | |
H H H H

(6biv)
Pentane => C5H12
% hydrogen = 12(H)/12(H) + 5(C) *100/1
= 12/12+60 *100/1
= 12/72 * 100%
= 0.1667*100%
= 16.67%

(6ci)
Amphoteric oxides are oxides which behave as both basic and acidic oxides

(6cii)
Al2O3(s) + 6HCl(aq) ---> 2AlCl3(s) + 3H2O(l)

(6ciii)
Solubility = Mass/Molar mass * 100/volume
= 50/105 * 1000/200
= 2.38mol/dm³





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