1999 - JAMB Chemistry Past Questions and Answers - page 4
31
A pair of compounds that can be used to generate a gas which has physiological effect on human beings is
A
sodium trioxonitrate (V) and calcium chloride
B
sodium dioxonitrate (III) and ammonium chloride
C
sodium trioxonitrate (V) and ammonium chloride
D
sodium dioxonitrate (III) and potassium chloride
correct option: a
Users' Answers & Comments32
Hydrogen is used in oxy-hydrogen flames for melting metals because it
A
evolves a lot of heat when burnt
B
combines explosively with oxygen
C
is a very light gas
D
is a rocket fuel
correct option: a
Users' Answers & Comments33
What properties of duralumin make it more useful than its constituent metals?
A
It is heavy with a high melting point
B
It is malleable and has high density
C
It is strong and light
D
It is hard and ductile
correct option: c
Users' Answers & Comments34
The pair of metals in the reactivity series that are usually extracted by the electrolysis of their ores is
A
magnesium and zinc
B
magnesium and calcium
C
copper and zinc
D
lead and calcium
correct option: b
Users' Answers & Comments35
A metal that can be extracted from cassitertite is
A
cacium
B
magnesium
C
tin
D
copper
correct option: c
Users' Answers & Comments36
Which of the following metals is passive to concentrated trioxonitrate (V) acid?
A
Iron
B
Tin
C
Copper
D
Zinc
correct option: a
Users' Answers & Comments37
The hydrocarbon that burns in air with a sooty flames is
A
C2H6
B
C3H8
C
C4H10
D
C6H6
correct option: d
Users' Answers & Comments38
2-methylprop-1-ene is an isomer of
A
but-2-ene
B
pent-1-ene
C
2-methylbut-2-ene
D
2-methylbut-1-ene
correct option: a
Users' Answers & Comments39
Which of the following is a solvent for perfumes?
A
C5H12
B
C4H6
C
CH3COOH
D
C2H5OH
correct option: d
Users' Answers & Comments40
When excess ethanol is heated to 145oC in the presence of concentrated H2SO4, the product is
A
ethyne
B
diethyl sulphate
C
diethyl ether
D
acetone
correct option: c
Users' Answers & Comments