EX 7
31. Which of the following.
solutions is the WoNST,
conductor of electricity?
E (2) only
35. Which of the foll
statements about à
homologous series in
育教化文頁三第張四第 日十初月四年未己籐夏 WAH KIU YAT PO $101 =
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B
Chemistry (30)
(Reginald Chu).
D
khon dilute hydrochloric
E
beid is adde to the
Lon of a colourless
id X, white precipitate observed which di
on heating, Which of the following substance most probably the solid A. løed(11)nitrate
silver nitrate::
lead chloride. potassium sulphate.
calcium carbonate
ich of the following metals viTI NOT: 14berat
hydrogen gas from hot caustic soda f
sodium hydroxide)
magnesium
lead
zine
alimin jum
centrated
hydrogen sulphide gas
passed into an aqueous solution of iro
chloride which of the following substances are
in the products?
(1) iron(III)chloride (2) sulphur
(3) hydrochloric acid -(4) iron(ȚI)sulphide (1) and (2) only
(2) and (4) only
(3) and (4) only (1), (2) and (3) only (2), (3) and (4) only
Which of the following
statements about fron
are correct?
It can form ions with
valencies +2 and +3.
It occurs naturally
combined only with It can be used as catalyst for certain
processes,
Many of its compounds
are coloured.
gen
It is the main component
of the, alloy, steel
The oxidation number
the species X,0
A. molar hydrochloric acid
molar ethannic acid
molar ammonia solution,
impure water
molar sugar solution
32. In the electrolysis
ncidulated water using
platinum electrodes,
ratio of liydrogen to oxygen
liberated by mass-
factors
the following
ill influence the
discharge of an
ion at an electrode during
electrolysią“
(1) The autre of the
clectrode used.
(2) The quantity
of
electricity passed.
(3) The temperature of
the electrolyte.
vucentration of
the ions concerned,
(1) and (3) only B. (2) and (3) only C. (2) and (4) only D. (3) and (4) only E. (1) and (4) only
34. When a 5M solution of
sodium chloride is electrolysed with carbon electrodes, which of the following results is/are
true
(1) The reaction at the
cathode can be
represented. by the following ioni
equation:-.
(2) Chlorine gas 19-
liberated at the
anode.
(3) The resulting
solution of the
electrolysis.
alkaline.
(4) The substances
liberated at the
cathode and, anode
respectively are in the molar ratio
(4) only
(2) and (4) only
D, (2) and (3) only
筈。沙動
·36.
general is INCORRECT ?
A. All the members have the
sume empirical formula All the members have a
general molecular formula
Fach member differs from
the next by a methylene
unit, (Hŋ-, in their molecular formula
The boiling points
increases gradually as
the number of carbon
atoms increases.
E. The molecular weight
increases regularly by 14
When ethene is passed into
the aqueous bromine solution, the chief product obtained has a structural
formula of
OI!
37. In the diffused sunlight,
methane reacts with chlorine
to give a mixture of
products. Which of the
following substances may
be present in the mixture
(2) CH¿CI
(5) CHCI
(4) CC1
A. (1) and (3) only
B. (2) and (4) only
c. (1), (2) and (3) on
(2), (3) and (4) only. E. (1), (2), (3) and (4)
38. In the experiment as shown
he low the bulb docs NOT
light up when the key Q switched on.
Which of the
following conslusions is
most likely?
filb
Liquid hydrogen
chloride
key Q
bettery
carbon
electrode's
六期星
日五月五年九七九一曆年八十六國民華中
Liquid hydrügen chlorid
a dou-electro
· Liquid hydrogen oride
is composed of covalen, t
molecules only. Liquid hydrogen chloride consists of ions which are not mobile.
Pure, liquids do not
conduct electricity La Only solutions will
conduct electritity
When a mixture consisting
one mole of ethel
ethanñate and one mole of
water is
llowed to stand
for a long time, the substaures then present in
tive mixture are
ethyl ethunoate and water only.
nol, erlanoic acid,
ter and ethyl
thanol and ethanoic açı
only.
vanol
ethyl
etharinate
ethanoic aci ethyl
water
hanoat
C12
Fight
CL2C1COOH + HCI
The reaction
by the above
known as
substitut tan
B. addition,
C. hydrolys
D. esterification
E
neutralization
41. Which of the, following
statements about carbon
dioxide and sulphur dioxide.
js INCORRECT?,
A. Both are soluble in
water to giye, a
dibësie acid.
B. Both are colourles
odourless gases,
Both give white
precipitate on passing
into aqueous barium
chloride solution,
Both can oxidize
burning magnesinm,
Bötli do not suppërt the
combustion of cand
k(s) + X(aq) Y(aq) + 2(s)
Which of the following may
he rate of the
reaction represented by the equation above"
(1) Concentration of x
(2) State of
of W
(3) Temperature
ision.
A) whe
B. (2) only
C. (1) and (2) only
D. (2) and (3) only
(2) and (3) on)
• (Ny(2) + 3}\(8)
2NH_ ( g )
In the above reaction,
which the following
condi
the lis ammonia
produce
eld of
High pressure, and
Tow temperature.
Tigh pressure and.
high temperature
pressure and.
ch temperature
Low pressure and
low temperature
heat
Normal temperature and
pressure
When ordinary soap. is:
added into a hard water
scum" is formed. The
mainly consists:
(1) calcium stearate
(calciun
ectadecanoate)
magnesiumstearate
(magnesium
coctadecanoate)
(3) celcium carbonate.
(4) calcium sulphate
(2)
and (2) mly
(2) and (3) only (2)
and (4) onl
Which of the following reagents is/are usually
Stored in brown boti
(1) le
(2)
ABNU
(3) UNO, (4)
(1), (2), and (7) only and (2) only and (3) only
41. B
THE
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