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736
Oxygen gas can be prepared by heating?
A.
ammonium trioxonitrate (V)
B.
ammonium trioxonitrate (III)
C.
potassium trioxonitrate (V)
D.
manganese (IV) oxide
View Answer & Discuss (8)
JAMB 1991
737
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
View Answer & Discuss (1)
JAMB 1991
738
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
View Answer & Discuss (2)
JAMB 1991
739
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
View Answer & Discuss (3)
JAMB 1991
740
Copper (II) tetraoxosulphate (IV) is widely used as a?
A.
fertilizer
B.
fungicide
C.
disinfectant
D.
purifier
View Answer & Discuss (9)
JAMB 1991
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