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Waec 2019 CHemistry Essay And Objective Answers – May/June Expo

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How to Get 2019 WAEC 2019 MAY/JUNE CHEMISTRY Question Paper.

Follow the steps below to get your waec may/june chemistry questions and answers 1 hours before your exam time.

CHEMISTRY OBJ

1-10: BCACDADACA
11-20: DDCADAACBA
21-30: BCABBDDBAA
31-40: DDCBDCDBCB
41-50: BACBCCBDDD

====

(1a)
(i)High temperature of 4500C or more
(ii)High pressure
(iii)Catalyst
(1b)
(i)For decoration
(ii)For protection against corrosion
(1c)
(i)Calcium oxide(CaO) is alkaline and HCl is acidic.The two react to form calcium chloride and water.
(ii)Conc. H2SO4(aq)
(1d)
Conc. HNO3(aq) reacts with a solution of FeSO4(aq) the Fe^2+ was oxidized to yellow Fe^3+ and brown NO2(g) given off
i.e 2HNO3(aq) + 2FeSO4(aq) + H2SO4 —-> Fe2(SO4)3 +2NO2(g) +2H2O
(1ei)
ZnO + H2SO4 —>ZnSO4 +H2O
ZnO +2NaOH + H2O —>Na2Zn(OH)4
(1eii)
Basic oxide
(1f)
(i)They have the same number of proton
(ii)They have different mass number
(1g)
Hydrochloric acid and oxygen
(1h)
(i)H2S
(ii)SO2
(1i)
It is the average mass of atoms of the element on which one atomof carbon
It is the number of times the average mass of one atom of the element is heavier than 1/12th of the mass of one atomw carbon 12
(1j)
(i)Rate of forward reaction is equal to rate of backward reaction
(ii)It is reversible
===

(2a)
(i)C10H22—–>(cracking)—->C6H14 + C4H8
P is C4H8
(ii)
H H H H
| | | |
H-C=C-C-C-H
| |
H H

H CH3 H
| | |
H-C= C- C-H
|
H
(iii)
(2b)
Hundi’s rule:Electrons occupy each orbital singly first before pairing takes place in a degenerated orbital
Aufbau’s principle:Electrons enter into orbitals in order of increasing energy

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2019 WAEC CHEMISTRY(ESSAY ; OBJ) MAY/JUNE Expo –

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