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2831
NaCl(s) does NOT conduct electricity, but N(aq) does. This is because
A.
NaCl(s) is non-ionic but NaCl(aq) is ion
B.
NaCl(aq) contains mobile electrons, where absent in NaCl(s).
C.
NaCl(aq) contains mobile ions which Nacl,) does not contain.
D.
NaCl(s) ionizes partiality while NaCl(aq) iodizes completely.
E.
NaCl(s) decomposes when heated but NCl(aq) is stable to heat. –
View Answer & Discuss (3)
NECO 2001
2832
To test for the presence of chloride ions in ion, correct sequence of reagents to use is
A.
Ba(NO
3
)
2
(aq) then HNO
3
(aq).
B.
HCl(aq) then Ba(NO
3
)
2
(aq).
C.
HCl(aq) then Ag
3
(aq).
D.
HNO
3
(aq) then fresh FeSO
4
(aq).
E.
HNO
3
(aq) then AgNO
3
(aq).
View Answer & Discuss
NECO 2001
2833
Ethanol is a product of fermentation of simple sugars. Which method is used to separate ethanol from the other products?
A.
boiling off the ethanoic
B.
filtration
C.
fractional crystallisation
D.
fractional distillation
E.
isomerisation
View Answer & Discuss
NECO 2001
2834
Which method is NOT used to determine rate of a reaction?
A.
change in amount of precipitate formed
B.
change in equilibrium constant
C.
change in intensity of colour
D.
change in pH values.
E.
change in total gas pressure
View Answer & Discuss (1)
NECO 2001
2835
Detergents are better than soaps for washing in hard water because
A.
hard water contains insoluble calcium salts.
B.
they contain bleaching powder.
C.
they contain palmitic acid.
D.
they do not form insoluble calcium and magnesium salts.
E.
they are organic compounds.
View Answer & Discuss (2)
NECO 2001
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