貢四第張九第 日一初月四年未己腦复
1979
Fe¿U,(s) + S0, (g) $0,(g)
WAH KIU YAT PO
報日僑華
四期星
日六十月四年九七九一屣公年八十六國民奉藏中 青教僑華
when it is in the
molten state.
2FeSO, (s)
The plf of the solution
中學會考試題預習專欄
化
(廿九)
明德出版社朱宏林提供資料
學
Which of the followin statements, about' the.
CHEMISTRY (29)
increases to about 12.
increases to about 72
decreases to about
most probably present:ki
the golution X?
Zu
decreases to a
about
E.
remains the same,
16. Which of the following acids
will form two series of
Fe
(Reginald W. Chu)
Which of the following is
NOT
property of conc
sulphuric acid?
A. a dehydrating agent
B. a non-volatile acid
C. an oxidizing agent
D. a drying agent
E. a typical strong acid
Which of the following gases may be collected by displacing air downwards (ar upward delivery)?
(1) nitrogen monoxide gas
(2) chlorine gas (3) etheneg03.
(4) hydrogen gas (4) only
B. (1) and (4) only
C. (3) and (4) only
(2) and
(4) only
D
E. (1), (3) and (4) only
A certain ion has 23
electrons and a mass number of 56. If the charge of the
ion is +3, then the-number
of neutrons in the nucleus
33
B. 79
C21
D.
E. 30
P and Q have the following
composition:-
Now of No, of No. of
protons neutrons electrons
12
and Q would be
described as
A. isotopes
B. cations:
C.alletropes
D. anions
noble elements
10
10
Z has a high melti
point.
Periodic Table, is NOT
correct
The elements with similar
chenical properties are.
in the same vertical
group.
There are more metals
non-metals.
They are listed in the
increasing order of
atomic weights.
The most reactiv感
non-metals are found in
the top right-hand corner
of the cable.
The melting points and.
boiling points.of the
elementa increase down a
group.
7. The shape of ammonia
molecule can be described as A. linear:
B.
tetrahedral
C. angular
D. pyramidal
V-shaped
*Diamond and graphite
defferent forms of
clement, carbon.
Which of the following. is/are evidence of the truth of this statement?
The volume of gaseous
products, measured at s.t.p. on heating 3.04g of iron(11) sulphate strongly (at. Wt. Pe=56, 8-32 0=16)
112cm?
C. 336cm3 ».56cm3 E.28cm
IT. In a particular experiment
-20cm
gaseous element
X combine with 30cm of
another gaseous element Y
to give 10cm of a gaseous
product Z. If both X and Y
are diatomic, what will be the most probably formula
ixture consisting of
20em-
100m of hydrogen
me tahane and 50cm
oxygen were exploded in an endiometer. What would be
the volume of the gas(es)
left behind after explosion? (ALL) volumes were measured
at the same temperature.
Cand pressure.
(1) Both are similar in
appearance.
A.
20cm
30cm
40cm
50cm:
(2) Both have the same
melting point.
(3) Both conduct.
electricity.
(4) ♬ given mass of
either will yield the same mass of
carbon dioxide on.
complete combuation: (4) only
and: (2) only
C. (3) and (4) only
D. (1), (2) and (4) onl E. (2) and (3) only
The electronic configuration 9. At 25°C and 770mmile of
of the elements X and Y are
(2.8.8.2) and (2.8.7) respectively and a compound
Zis formed between x. and Y.
Which of the following
statements about 2 is NOT
correct?
a. The most probable:
formula of Z is XYn
Z is formed by electron
transfer.
C. Z is volatile.
品
D. Z conducts electricity.
建築工程招標啓事
招工務局除字乙蔽或丙級承建商投承新界業務和宜合道 廿二號(聖公會發理浩夫人中心)擴建工程
工程內容:(甲)加建兩層每服業約200呎::
(乙)五年大版業
如有意投承者朗子一九七九年五月十五日前以書面通知伍
pressure, 16cm of oxygen
consists of the same number
of molecules as
1 cu of hydrogen:
of carhon dioxide
C. 16cm2 of helium D. 9cm3 of water vapor E. 14cm) of nitrogen
10, When anhydrous iron(II)
sulphate is heated strongly。 the reaction taking place is represented by the
following equation:
·凡 分鐘爾籍九
60cm2
13.5.74g of a hydrated metallic
sulphate of formula
MS04 •x!!,0, where M denotes the metal) give 3.22g of anhydrous salt on heatin
What is the value of
the formula?
(A+. Wf. N=65, S-32
Which one of the following
compounds does NOT yield oxygen on heating:
A. potassium nitrate B. copper(II)nitrate silver(II)nitrate
ammonium nitrate
F. leed(II)nitrate
15. Powdered zinc carbonate is.
added to sulphuric acid
until effervescence stops,
辦承商招
acid salts with sodium
hydroxide?
AHCOOH
H. FNO.
C. HyStu
D
F. CH-COOH
Which of the following substances, when dissolved
rns blue litmus in water
NIC1
B. Na2C03
KNOT
D. CIL COONa
Na2SU
student has spilled some
concentrated sulphuric acid
on his hand. The first thing
he has to do is to wash his
affected hand with
-sndium- hydroxide solution
B. dilute sodium
hydrogencarbonate
solution
vinegar
water
E. harium chloride solution
19. What volume of 5y sulphuric:
acid must be diluted with
water in order to prepare
250cm- of 0.1M sulphuric
iu5cm
2-5cm
5.0cm
25cm
50cm
20. When 25en" of molar sodium
hydroxide is mixed with: 25cm3 of molar sulphuric acid, the resulting solution will consists of water and sodium hydrogen sulphite
sodium sulphite sodium hydrogen sulphate
godium sulphate
E, sodium sulphide
When sodium hydroxide
solution is added to a
colourless aqueous solution
an oxide of a
divalent metal X reacts
with an excess of dilute
hydrochloric acid to give
9. of its chloride. The
lative atomic mass of X
is most probably
48
X, Y and Z are three metals.
Carbon at red heat will
reduce the, oxides of X and
Y but not the oxide of Z.
can remove axygen from
the oxide of X. Basing on
the above information.
metals in Frange the decreasing order of their
reducing
A. X,
E.
24, Which of the following
oxides, at red-hot, can be
reduced by carbon bat not
by hydrogen?
copper(11) oxide lead(JI)oxide
calcium oxide
zinc(II)oxide
E. aluminium oxide.
25. The aqueous solution of
compound X gives a white precipitate with acidified
silver nitrate solution and
gives an alkaline gas when
heated with sodium hydroxide
solution. The compound X
is most probably
A,”ammonium bromide
B. ammonium sulphate
C.
ammonium hydrogencarbonate
B. potassium indide
E. ammonium chloride
ANSWER:
E
2.C74
3. E
X, a precipitate is observed1 which will dissolve in both ammonia solution and sodium hydroxide solution. Which
of the following cations is
9. C
12.
16, 9:21. A
17.A 22
13. D 18. D 23. D
14 D
24
A D
5. C10B 15. D 10, C 257 E
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