2012 - JAMB Chemistry Past Questions and Answers - page 4
31
Commercial bleaching can be carried out using
A
sulphur (IV) oxide and ammonia
B
hydrogen sulphide and chlorine
C
chlorine and sulphur (IV) oxide
D
ammonia and chlorine
correct option: c
Users' Answers & Comments32
Mineral acids are usually added to commercial hydrogen peroxide to
A
oxidize it
B
decompose it
C
minimize its decomposition
D
reduce it to water and oxygen
correct option: c
Users' Answers & Comments33
Which of the following compounds will burn with a brick-red colour in a non-luminous Bunsen flame?
A
LiCI
B
NaCl
C
CaClN2
D
MgClN2
correct option: c
Users' Answers & Comments34
The purest from of iron which contains only about 0.1% carbon is
A
pig iron
B
wrough iron
C
cast iron
D
iron pyrite
correct option: b
Users' Answers & Comments35
A common characteristic between zinc and the other transition elements is the ability to
A
have variable oxidation states
B
from complex ions
C
act as a catalyst
D
from coloured ions
correct option: b
Users' Answers & Comments36
Which of the following metals is the least reactive?
A
Pb
B
Sn
C
Hg
D
Au
correct option: d
Users' Answers & Comments37
Geometric isomerism can exist in
A
hex-3-ene
B
hexane
C
prop-l-ene
D
3-methyl but -l-ene
correct option: a
Users' Answers & Comments38
Alkanals can be distinguished from alkanones by the reaction with
A
sudan lll stain
B
starch iodide paper
C
lithium tetrahydrido aluminate (lll)
D
fehling's solution
correct option: d
Users' Answers & Comments39
The isomers of C3H8O ARE
A
1 - propanol and 2 - propanol
B
1 - propanol and 1 - propanol
C
2 - propanol and 2 - propanone
D
2 - propanol and 1 - propanol
correct option: a
Users' Answers & Comments40
Carbohydrates are large molecules with the molecular formula C x (H2O)y. In which of the following pairs is x not equal to y?
A
glucose and starch
B
maltose and starch
C
sucrose and fructose
D
maltose and starch
correct option: a
Users' Answers & Comments