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2906
When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolve in excess sodium hydroxide because
A.
sodium hydroxide is a strong alkali
B.
sodium is more reactive than zinc
C.
zinc is more reactive than sodium
D.
zinc hydroxide is amphoteric
E.
zinc hydroxide is unstable
View Answer & Discuss
NECO 2008
2907
A chemical system is at equilibrium when
A.
δ G is positive
B.
δ G is zero
C.
δ S is negative
D.
δ S is positive
E.
δ S is zero.
View Answer & Discuss
NECO 2008
2908
Brownian motion explains
A.
Boyle’s law
B.
Collision theory
C.
Laws of chemical combination
D.
Molecular motion in liquids and gases
E.
Vibrational motion in liquids.
View Answer & Discuss
NECO 2008
2909
The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces
A.
calcium chloride, carbon (IV) oxide and water
B.
calcium chloride, and trioxocarbonate (IV) acid
C.
calcium hydroxide, carbon (IV) oxide and chlorine gas
D.
calcium hydroxide, carbon (IV) oxide and water
E.
calcium metal and water.
View Answer & Discuss (1)
NECO 2008
2910
If two elements X and Z with electronic configurations 2,8.3 and2,8,6 respectively combine, the compound formed will have the formula
A.
XZ
B.
XZ
2
C.
X
2
Z
D.
X
2
Z
3
E.
X
3
Z
2
View Answer & Discuss (4)
NECO 2008
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