1991 - JAMB Chemistry Past Questions and Answers - page 4
31
Which of the following salts can be melted without decomposition?
A
Na2CO3
B
CaCO3
C
MgCO3
D
ZnCO3
correct option: a
Users' Answers & Comments32
Oxygen gas can be prepared by heating?
A
ammonium trioxonitrate (V)
B
ammonium trioxonitrate (III)
C
ppotassium trioxonitrate (V)
D
mamgamese (IV) oxide
correct option: c
Users' Answers & Comments33
Addition of aqueous ammonia to a solution of Zn++ gives a white precipitate which dissolves in an excess of ammonia because?
A
zinc is amphoteric
B
zinc hydroxide is readily soluble
C
zinc forms a complex which is readily soluble in excess ammonia
D
ammonia solution is a strong base
correct option: c
Users' Answers & Comments34
Which of the following, in clear solution, forms a white precipitate when carbon (IV) oxide is bubbled into it for a short time?
A
KOH
B
NaOH
C
Ca(OH)2
D
AI(OH)3
correct option: c
Users' Answers & Comments35
Which of the following metals can be prepared in samples by the thermal decomposition of their trioxonitrate (V) salts?
A
Copper and mercury
B
Silver and copper
C
Mercury and silver
D
Magnesium and mercury
correct option: c
Users' Answers & Comments36
Copper (II) tetraoxosulphate (IV) is widely used as a?
A
fertilizer
B
fungicide
C
disinfectant
D
purifier
correct option: b
Users' Answers & Comments37
Which of the following compounds can exist as geometric isomers?
A
2-methylbut-2ene
B
But-2-ene
C
But-1-ene
D
CI-C-Br
correct option: b
Users' Answers & Comments38
How many grams of bromine will be required to completely react with 10 g of propyne?
(C = 12, H = 1, Br = 80)
(C = 12, H = 1, Br = 80)
A
20 g
B
40 g
C
60 g
D
80 g
correct option: d
C3H4 + 2Br2 - C3Br4 + 2H2
(36 + 4) (4 X 80)
40 g of C3H4 reacts with 320 g of Br
10 " " will react with
(10)/(40) x (320) /(1) = 80g
Users' Answers & Comments(36 + 4) (4 X 80)
40 g of C3H4 reacts with 320 g of Br
10 " " will react with
(10)/(40) x (320) /(1) = 80g
39
Ethene when passed into concentrated H2SO4 is rapidly absorbed. The product is diluted with water and then warmed to produce?
A
ethanol
B
diethyl ether
C
ethanal
D
diethyl sulphate
correct option: a
Users' Answers & Comments40
One advantages of detergents over soap is that detergents?
A
are easier to maufacture
B
foam more than soap
C
form soluble salts with hard water
D
are able to deter germs more than soap
correct option: c
Users' Answers & Comments