1994 - JAMB Chemistry Past Questions and Answers - page 3
21
Which of the following is the correct order of decreasing activity of the metals Fe, Ca, Al and Na?
A
Fe> Ca> Al> Na
B
Na> Ca> Al> Fe
C
Al> Fe> Na> Ca
D
Ca> Na> Fe>, Al
correct option: b
Users' Answers & Comments22
Which of the following compounds is NOT an isomers of 2,2 dimethylbutane?
A
2-methylbutane
B
3-methylpentane
C
2,3-dimethylbutane
D
2-methylpentane
correct option: a
Users' Answers & Comments23
When sodium is added to ethanol, the products are?
A
sodium hydroxide and water
B
sodium hydroxide and hydrogen
C
sodium ethoxide and water
D
sodium ethoxide and hydrogen
correct option: d
Users' Answers & Comments24
The general formula of alkanoates is?
A
RCHO
B
R2CO
C
RCOOH
D
RCOOR
correct option: b
Users' Answers & Comments25
One mole of a hydrocarbon contains 48 g of carbon. If it vapour density is 28, the hydrocarbon is?
A
an alkane
B
an alkene
C
an alkyne
D
aromatic (C = 12, H = 1)
correct option: b
Users' Answers & Comments26
Which of the following reagents will confirm the presence of unsaturation in a compound?
A
Fehling's solution
B
Bromine water
C
Tollen's reagent
D
Benedict's solution
correct option: b
Users' Answers & Comments27
A
magnesium
B
helium
C
chlorine
D
neon
correct option: a
Users' Answers & Comments28
A
oxygen in air
B
water vapour in air
C
CO2 in air
D
arygen in air
correct option: b
Users' Answers & Comments29
A
-100 kJ mol--1
B
+ 100 kJ mol-1
C
+50 kJ mol-1
D
-50 kJ mol-1
correct option: d
Users' Answers & Comments30
A
y - x
B
x
C
x - z
D
y
correct option: a
Users' Answers & Comments