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有教僑華頁三第張五第日五十月四年丑突
1973英文中學會考試題預習專欄
化學科
接第五張第二頁
D. to serve a flux
(†)
to impart the colour to the flame.
A white crystalline soliɑ ɔn heating yields a colourless gas which neigrites a glowing splint. A solution of the solid with sodium hydoxide produces a gas upon heating, the gas turns wet red litmus blue. The solid can be:
ammonium chloride ammonium nitrate sodium chlorate
sodium nitrate
E. potassium chlorate
A white solid X, on heating, give off a colourless gas, leaving a white soluble solid Y. On adding barium chloride solution to a solution of Y, a white ppt, was obtained. X can be
calcium sulphate.
B. calcium carbonate C. sodium carbonate D. sodium bicarbonate.
A.
sodium sulphate
X is a white powder, insoluble in water. When it is heated.. strongly a colourless gas which turns lime water milky is given off. A brick red flame is obtained when X is burned in a Bunsen flame. X can be
Zinc carbonate
B. Calcium carbonate
Calcium sulphate
D. Barium carbonate-
E. lead chloride
When ammonium hydroxide is added to a solution of zinc. sulphate a precipitate is form- ed which will dissolve in excess of ammonium hydroxide. This is because
A. Zinc hydroxide is amphoteric B. Zinc forms a complex anion 0. Zino forma a complex cation D. ammonium hydroxide is a weak
base
E. ammonium hydroxide is a
strong base
A colourless soluble solid reacts with dilute hydrochloric acid to give a white précipita- te when cold. The white pre- cipitate dissolves when the solution is heated. Which of the following is most probably the solid?
P. Lead nitrate
Q. Calcium carbonate
R. Lead chloride
S. Potassium sulphate
T. Zinc nitrate
A colourless compound gives Oxygen only when heated alone but an oxide of nitrogen when heated with ammonium chloride. Only one may conclude that the compound is
P. Potassium nitrite Q. Sodium peroxide
R. Calcium nitrate.
S. Potassium nitrate T. Potassium nitrite
Barium chloride solution is
added to a neutral solution of an unknown substance. A white precipitate X is obtained. X may be
I. Chloride. II Sulphate III. Sulphite
IV. Carbonate
V. Nitrate.
P. I or II
Q. I or IV
R. II only
S. II, III or IV
T. I, IV or V
When dilute sulphuric acid was added to a black solid, a gas
When the gas. was was evolved. pass into acidified potassium dichlormate solution, the solution turned green and a precipitate of sulphur appeared The black solid was most probably
WAH KIU YAT DO.
P. Copper (II) oxide
Q. Manganese (IV) oxide R. Iron sulphide 5. Iron filings
T. an allotrope of caroon
報日僑生18 MAY 1973
CITY: HALL,
四期星
10. A solution gave a white
precipitate on addition of a solution of lead nitrate. Half of the precipitate dis- appeared on addition of dilute nitric acid. The other half disappeared when the liquid Was boiled. The solution originally contained
P. Carbonate and sulphate Chloride and hydroxide R. Nitrate and sulphide 5. Chloride and sulphate T. Carbonate and hydroxide
One of these five carbonates is white, precipitated from solution by addition of sodium carbonate, easily soluble in dilute sulphuric acid to form a clear solution, and forms a soluble bicarbon- ate. Which one?
Magnesium carbonate B. Lead carbonate C. Zine carbonate D. Calcium carbonate
E. Ferrous carbonate.
12. A white solid on heating gave off a gas which relit a glow- ing splint and left a residue: which gave off light brown fumes on treatment with dilute hydrohloric acid. The original solid was possibly
A lead nitrate
B. potassium nitrate
C. ammonium nitrate D. sodium nitrite
magnesium nitrite.
On heating, a white powder liberated a gas which turned lime water milky. After prolonged heating a residue. remained which dissolved free-. ly in water to give an solut- ion. The white powder could be
A. ammonium carbonate B. Zinc carbonate
C. potassium carbonate
D. Magnesium carbonate
E. Sodium bicarbonate
A
VA
A white crystalline solid X decomposes on heating produc- ing a crackling noise. brown gas is produced which will relight a glowing splint, and a yellow residue is left. When X is dissolved in water and ammonium hydroxide is added a white precipitate is formed which is insoluble in excess ammonium hydroxide. X may be
Lead oxide B. Zinc oxide
C. Lead nitrețe
D. Zinc nitrate E. Sodium nitrite
A solid was dissolved in water? and sodium hydroxide solution was added. A white precipit- ate was produced which did not dissolve in excess sodium hydroxide solution.. solid would be
A. sodium sulphate
ammonium chloride
magnesium nitrate
D lead nitrate
E barium sulphate
This
16. Heating a blue-green crystall-
ine solid, X, evolved a mix- ure of two acids, A and B.. The other gas, C, relights a glowing splint.
P. substance X could be lead
nitrate
substance Y could be nitrogen dioxide
substance Y could be bromine Acids A and B could be sulphurous acid and sulphuric acid.
1. The gas C could be nitrogen
Answers (30)
1973英文中學會考試題預習專欄
日七十月五年三七九一公年二十六國民華中
there is very little yolk,
food being provided by the mother's blood.
生物科 (三十)
12. In all mammals fertilization
must internal
Biology (30)
Multiple Choice Revision Exercise
Which of the following verte- brates always breathe by lungs?
A. Birds and amphibia
B. Birds and insects
C. Mammals and amphibia
D. Mammals and insects. E. Birds and mammals
A food stuff in which hydrogen.
and oxygen are present in the same ratio as in water is
fat
B. protein
Camino-acid
D. carbohydrate
E vitamin
In a stem, cambium tissue is located next to the
A. stomates.
B. guard cells
C. epidermis
D. pith
E xylem and phloem
4. In a balanced aquarium, the
animals supply the green plants with
A. Oxygen
B. Carbon dioxide
C. energy-
carbohydrates
calcium phosphate
5. All of the following factors
may be involved in transpirat- ion except
A. evaporation B. cohesion
0. root pressure D. condensation
E. capillarity:
Directions: Each of the following item (NO. 6-15) consists of an
assertion (statement) followed by a reason. Select
A. if both assertion and reason are true, and are related as cause and effect.
if both assertion and reason are true, but are not related as cause and effect.
C. if the assertion is true, but
E.
the ment
reason is a false state-
if the assertion is false, but the reason is a true statement.
if both assertion and reason are false statements.
3.
BECA
the egg develops inside a protective organ,
the uterus.
The offspring of mammals are few in number
BECAUSE
they are protected before and after birth.
Blood is pumped by the heart into vessels called veins, which have thin muscular walls
·BECAUSE
the internal pressure is high
15. Yeast cells obtain energy by
fermentation.
BECAUSE
they give off carbon dioxide and alcohol
16. In diabetes, excess sugar is
found in the urine because
the basal metabolism is decreased
the kidneys are in a state of hypertension
the cells cannot utilize glucose
an excess of insulin is produced insufficient hyroxin is formed
All of the following are physical factors of the environment except
A. sun light
B. temperature C. humidity D. community
wind
18. In garden peas, if 50% of the
offspring are short, and 50% are tall, the parent plants were probably
A. TT x tt
B. It x tt
0. Tt x TT
D. Tt x It
E. TTX TT
19. A cross in which – of the
offspring appear dominant is
A. Rrx RR B. RR X rr
C. Rrx rr
D.
Rrx Rr
E. RR X RR
20. When hybrids are crossed, the
genotype of the offspring is
6. Insects are useful in the pollination of flowers
1:1
BECAUSE
B.
31
without them no flowers could be pollinated
E.
7.
The pulmonary artery carries deoxygenated blood
BECAUSE
it sends blood to the lung
8. In cold weather, larger amounts
of more dilute urine are produced,
BECAUSE
less water is lost through the sweat glands.
Leaves lose more water through the upper surface
BECAUSE
there is a waxy layer, the cuti -cle, over the lower epidermis, and it has few or no stomata
If the sperm cell of an
animal has 4 chromosomes,
then the number of chromosomes
in the body cells is
A 2 B. 4
Dr
B. 16
22. The egg-producing structure
of a mammal is called the
A. oviduct
B. ovum
C. ovary
D. ovule
E. uterus
Answers:
CARBOAMACAO
1.
C
2 B
9. B 10. Q
10. In long sight, near objects cannot be seen clearly BECAUSE
E 2. D
12.0
13. A
3. E
14. E
4. B
15. B
5. D
16. C
3. D
11. A
4.
12. B
rays from them are focused behind the retina
6. C
17. D
7. A
18. B
8. A
19. D
5.
13. E
14. C
11. The egg cells of mammals are
9. E
20. C
7.
15. C
large in size
10. A
21.
11. D
8. R
16. Q
22.
BECAUSE