KLFERNGE LIBRARI
16.
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百三十二月三年戌庚展夏 WAH KIU YAT PO
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四門星 日六十月四年〇七九一公年九十五國民華中
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ANSWERS TO PREVIOUS KIERCISES
·海道英文書院主編
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(十四):
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SECTION
II
1.0 2.D 3.A
1R 2.9 3.3.
4.B
5.D
5.P
CHEMISTRY (24)
QUESTIONS
The following reactions are all affected by Lign
xcept r
Combination between chlorine and hydrogen B. Combination between chlorine and methane C. Combination between chlorine and ethylene.
Combination between water and carbon dioxide in. green leaves
E. The darkening of silver chloride
Cheap grades of common salt get wet when exposed to air for some time,
because
A. Sodium chloride is deliquescen
9. Sodium chloride in efflorescen
G. Contains sodium hydroxide as an impurity
D. Contains salcium chloride as an impurity
B. Contains magnesium chloride as an impurity
If methyl alcohol is allowed to react with acidified potassium permanganate, it will be oxidized tor
A. Formaldehyde
B. Formic aold
CCarbon monoxide
D. Carbon dioxide
3. It is not readily oxidized under the given
condition
Which of the following compounds in aqueous: solution will turn red litmus blus”
I. Sodium hydroxide II. Sodium nitrate
III. Sodium acetate
IV. Sodium carbonate
V. Sodium bisulphate
Which of the following alternatives is correct?
I only
I, III, IV only
I, IV only
9. 1. V only 5. II
Vonis
After the accident, the injured driver was taken P. stable. 2. kennel.
PORST
nospital in an R. garage.
S. prison.
Tavator
person who walks on a road is called
Fmotorist.
2. passenger,
1. pedestri an
S. traveller:
T. qvelist..
SECTION
II. Read the following carefully:
One morning a gectionor was watering the florer-bada in a garden. At midday, he turned the tap off and went to sit in the shade of a tree to eat his lunch and have a rest.. A small boy and girl ran up when they saw him turn the tap off, and looked first et the tap and then at the gardener, When they saw that he had gone to sleep, the girl turned the tap on and meat the boy with the water from the hose-pipe. Then she began to wator a flower-bed. While she was doing this, the boy quietly turned the tap off. The girl did not know why the water had stopped so she looked into the hose-pipo
to sea what bed kappened. While she was doing this, the boy: turned the tap on again, and the girl got wat. She was zo surprised that she turned the boss-pipa stay from herself suddenly and wot the garians, she awoke with a big jump.
fera are ton statements about the passage.. Some of the are tuo and some of them are untrue. Put a tick (E against the ones that are true and a cross ( cgainst those that are untrue,
The story took place in- a big garden.
SECTION B: III 1. The game has been finished by them.
The news was told him by his friend.
IV
(or: He was told the news by his friend)
3. It was done by you yesterday.
4. They elected her "Kiss Hong Kong.
5. When will they set the man free?
DICK How are you going to spend the
svening, Sam?
SAM: Oh! to the cinema, perhaps.
I've done all my work. Have you done yours, Dick?
DICK: Yes, all that I am going to do.
then? SAN : Can you come with me,
DICK : Certainly! I am always ready to go
to the picturea.
SECTION (multiple choic
Choose the best answer and draw a firm line across the
right box.
A. is swimming. B. was swimming-
1 While Peter C. swims.
D, swam
E. will swin
sea, a jelly fish stung him.
A playeu... B play
Up to now we C
games,
are playing have played
E had slavað
in the
A B C D E
A. are crossing B. will croFS
A B C D E
D. crossed E. have ero3304.
Look carefully before you E. cross.
The gardener had turned off the tap before heơ
went to have lunch.
There were a lot of people di the garden.
3.
The gardener took a rest after lunch
If you are provided with three chemicals cono. sulphuric acid, potassium nitrate and ammonium chloride. Which of the following gases could you not prepare?:
4
The gardener was working hard when the chilärsä
played with the hose pipe.
A Nitrous oxide
B. Nitrogen diori..
C. Hydrogen chloride
D. Ammonia
E. Oxygen
8.
When a mixture of conc. sulphuric acid and solid. potassium bromide is heateds
A. Only pure
A. Only pure bromine 18 formed
B. Only hydrogen bromide is formea
C. A mixture of bromine and hydrogen bromide
formed
A mixture or bromine and sulphur dioxide in formed MTAA WA
EVA mixture of bromine, hydrogen bromide and
sulphur dioxide is formed
7. Which of the following substances can dissolve
readily in dilute hydrochloric acid?"
Only two children and the garconer wore in the
garden.
The gardener started watering the flowers at
midday.
The girl was surprised because water zuddenl
came out from the pipe.
The gardener jumped up from sleep bECRUSO
girl watered him.
All the taree persons et wat in the garden.
0000 0000 00
the road.
A. with B. at
A B C D E
Do you like sugar and milk G. for
D. of
5. beside
A. et B to
ABCDE.
Hurry
and make C. of yo
Don
mind.
One word in each line below does not rhyme with the
word written in capital letters. Put it in the margin on the right.
chock rot smoke boot look sno
tood quite near but still I could
P. 11sten
he ar
notice
them talk clearly.
-300
FOR ST
DOODD
1. Zino sulphide
IT. Lead chloride
TII, Barium sulphati
IV. Silver nitrate
V. copper sulphide
Which of the following alternatives is correct?
A. I, II only
B. I only
CI, V only
D. I, IV only
E. II, III, IV only
8. If 1.68 gm of a metal B is obtained through
reduction of 2.32 gm. of its oxide, given that the atoma weight or K is 56, the most probabli formula of the oxide is
A 20
3. MO
MO;
Exam
Hook
feel
COW
6. BLUE
7. DOOR
allow
SPADE: made lake
DEAR: clear 3pee
DARK walk
SPIT hit beat
do
drew
blow now
Jade paid stayed 2.
cheer heir fear
such
ay
car is not R. so
iseful as
P Q R S T
S much
rathet
split sat
blew
lit
boat to a fisherman.
ΠΟΤΕ
pour
choir
through
vär
8. FEEL
fil
SEW
CAME
§ to al
snow
amė:
eel
ohew go
stamp tame
steel 8.
flow 9.
When Mr. Lam does not go out he usually
keeps his car the Re garage.
P. stable.
kenne
PQRST
1'lare
prison. lavator
E
9. If a current of 4 amperes 18 passed through an
alectrolyte for two-thirds of an hour, and given that one Faraday is 96,000 coulomba, what is the volume of oxygen that will be liberated at NTP conditions?
A. 22.4 litres
B. 2,240.0.0.
C. 5.6 litras
D. 560 ml.
E. 280 ..
10. A white powder X 18BOLVES 10 water to produce blue Bolution. After acidification with dilute hydrochloric acid, barium chloride is added and a white precipitate appears. What will happen: if lead nitrate solution is added to an aqueoua solution of X?
A. No observable action
B. Evolution of a brown gas
The combination or onierine with ethylene is "ani addition reaction that need not be catalysed by light.
Magnesium chloride occurs as an impurity in common salt prepared from sea water, it is deliquescent substance.
Methyl alcohol 18 oxidized by @trong oxidizing agents to carbon dioxide and water
B (I, III, IV)
In addition to sodium hydroxide, solutions of sodium acetate and sodium carbonate are alkaline. This is because they are sodium salts of weak acids, partially hydrolyzed in water.
exceps ammonia, all other gases can be prepared b suitable combination of the chemicals
G. White precipitate insoluble in hot water
D
D. White precipitate soluble in hot water
E. Disappearance of the blue colour of the
original solution,
SOLUTIONS
As nyarogen promine is a reducing agent, it a readily oxidised by sulphuric acid to bromine, tho acid being reduced to sulphur dioxide.
7. B (I only)
Only zino sulphide is soluble in dilute hydrochloric acid. Although silver nitrate is noluble in water, it yields the insoluble silv chloride when in contact with hydrochloric acid.
1.68 gm. M combines with (2.32 - 1.68) - 0.64 en oxygen
1.e. 3 ± 56 (M) with 4 x 16 (0) thus formula1 M_0,
D
Gram-molecular нt.
Gran-molecular volume at NTF - 22.4 litres Since 1 gm, equivalent of oxygen 8 an Thue volume occupied. by 1 gm. equivalent of oxyge. at NTP (22.45) litres = 5.6 litres Quantity of electricity passed
-
(4x40xous courofius.
9,600 coulombe 071 Faraday
As 1 Faraday of electricity liberates gn- equivalent of oxygen, 0.1 Faraday would liberg si 0.56 litre of oxygen at NTP (560 m2;)
C
Barium eulphate is precipitated in the first reaction. Thus when lead nitrate solution 19 added, lead sulphate will be precipitated,