RARY
20 MAR 1968
3Cu + HNO3
佩佩
1968 中學入學試試題預習專欄
百益第四第
日二廿月二年申成饜
三期星
日十二月三年八六九一周公年七十五國民窳中
1968
英文科
(#)
·
王挺生・
TEST 20
中文中學會方言 化學科
類預習車欄
3Cu(NO3)2 + 480 + 20ƒ
(It)
王錦釗。
Time allowed
20 minutes.
1. One of these words can be used in the passage etierei
there is a number.
alam, grean,white, sunny, pleasant, purely.
gentle, sweet, warm,fresh, beautiful
Write the correct word in the space. any card more than once.
Do not use
It was a nice (1) morning in May, A nice (2) wind was blowing, and the sky was nice (3) blue. The nice (4) sunlight covered every corner of the ground. The afce (5) songs of the birds filled the nice (6) air. In the distance, & piece of alce (7)
Down there cloud hung over the nice (8) mountain.
several nice (9) boys were playing by the nice (10) waters. What a nice (11) acene it was! (1) sunny
(3)
(5)
(7)
(9)
(11)
(8)
12. In each bracket, underline the word which gives the
right meaning:
(a) She broke (much, a little, a few, very much) egga. (b) You will not find your watch (until, unless, tiil.
only) you look for it.
(c) My brother and I are not at all (like, likely,
dislike, alike),
(a) There are five (men's, man's, mens', dans') bata
in the shop window.
(e) This coat (sella, buye, paye, costs) more than 1
am able to pay.
Chemistry (21)
1. (a) Ammonia is prepared industrially by the Haber
process, Nitrogen and hydrogen are made to combine at 550°C. and under a pressure of 200-1,000 atmospheres. A catalyst, ferric oxide, in used and it is usually mixed with aluminium oxide to act as a promoter. During the reaction the ferric oxide is reduced by the hydrogen to finely-divided iron.
+ 3y = 20,
The actual conditions of temperature and pressure are chosen to give the most economicai yield of ammonis, but the nitrogen and hydrogen are not all used up. For example, yield of 15% is obtained at 550° and 250 atmospheres,
The ammonia is liquefied by cooling and the uncombined nitrogen and hydrogen are re- circulated through the plant.
(b) Almost all nitric acid is now manufactured by
the catalytic oxidation of ammonia, Nitrogen is first converted to ammonia by the Haber Process as described above,
Ammonia gas (106) and air (90% by volume) are passed through a platinum gauze catalyst, kept at red heat (850%.) The ammonia is oxidised to nitric oxide. In modern plants, the platinum may be alloyed with 10% rhodiu
50. 6NH3 +
6H.0
dilute
nitric acid
(b) When dilute nitric acid is added to zinc, a
colourless gas, nitrous oxide, which supports ! combustion, is evolved. The remaining solution. vhich is colourless, contains sine nitrate.
4Z 10HNO3 • 4Zn(NO3)2 + 3H2O✦ NH4NO3
(dilute),
NH,NO3 N20 + 220,
nitrous oxide
Ammonium nitrate
(c) Concentrated nitric acid added to iron rendere it passive'. Dilute nitric acid dissolves
iron to form ferrous nitrate, Fa(NO3)2, oxides of nitrogen and sometimes ammonium nitrate. The reactions are similar to those of dilute nitric acid with copper and zinc.
(d) When a mixture of concentrated nitric soid
ד
and sulphur are heated in a test-tube, the acid will oxidise the sulphur to sulphuric acid.
A colourless gas, nitric oxide, is obtained which turns brown on contact with air.
S+ ZHNO
-
#SO, ✈ 280 f
(e) When a mixture of concentrated nitric acid and
charcoal are heated in a test-tube, the acid will oxidise the charcoal to carbon dioxide.
C + WHNO
4NO2 + 00, + 2820 (f) When some concentrated nitric acid is added to a solution of ferrous sulphate acidified with dilute sulphuric acid, the nitric acid will oxidise the ferrous sulphate to ferria › sulphate.
6Ƒɑ304 + 3N2904 + 2HNO3 ~ 3F•2(90%)3
ferrous
@ulphate-
+ 4850_+_210 †)
ferric sulphate
3. Underline the correct one of the words in brackete
(a) the Queen's speech was heard ell (in, on, by, over
with) the world.
(b) I have been in this school (in, on, while, for.
810 ce) 957.
(c) My sister and I are not (lixe, live, lie, lain.
slike)
(d) She picked a (left, leaves, life, leaf) from the
tree.
(e) I shall be able to answer all the questions (why,
if so, that, until) I do my best.
4. Read the following passage carefully and then write
in the space on the right the number of the sentence which gives the best answer to each question.
·BLOMOVARE
suddenly.
In that country there were once many gooɗ One day the water of the river rose Regardless of the danger, few people started rowing across in a small boat. While they m wers, still in mid-stream, the boat overturned, srid" they had to swim. One, though using his arms fast and well, seémed to make little progress.
*You are a better swimmer than any of us, why are you lagging behind?” asked his friends.
"I have a thousand coins tied round my waist, said the man,
others.
"Why don't you throw them away?" urged the
The nitric oxide 11 then cooled temperature lower than 150°C. and it is then allowed to pass slowly with an excess of air
through an oxidising chamber where it is converted to nitrogen dioxide,
200+02
2N02
At 150°C. or higher temperatures nitrogen' dipxide dissociates into nitric oxide and oxygen, Consequently, a maximum yield of nitrogen dioxide can only be obtained at a, low temperature.
The nitrogen dioxide, in the presence of excess air, is then absorbed in water at about, 80°C. This avoids formation of nitrous acid (unstable to heat), and enforces the final reactions.
Using about 7.8 atmospheres throughout the process, about 93% yield can be obtained in modern plants, 48 excess water is used; the acid collected is of about 60% concentration:
2, (a) Bitric acid oxfises copper to form copper
nitrate in two wayŵ. When concentrated nitria meid is added, to copper turninga in a beaker, denes brown fumss of nitrogen dioxide are evolved," and a blus solution of copper nitrate-
LONG KON
He made no answer, shaking his head, though
he was clearly in difficulties.
The others reached, the shore and shouted out to him, "off with the coins, you fool! What's the use of the money to you when you are drowning?" -
Still the man shook his head, In a moment he
lost his life.
یوار
(a) The people crossed the river because
1. the water rose up
2. they were in danger
3. they could swim well
4. they had a boat
They had to swim in mid-stream beca1280
1. the water flowed rapidly
2 the boat was too samll.
3. they had no boat to sit in
d. they were good swimm# 37 16.
The best swimmer in the above story loved
"SWEDBANK
rowing a boat
3. money
his own life
W give up his coins
use his money wall
shake his head
maka'ah. ANSWER
He could not swim as quickly as the others because
the river' was too fas*
he could not breathe
5. no vas drowning
he had too many coins with hic
The solution turns elrk brown at first Owing to the formation of the brown compound, Fe50, •NO, which decomposes rapidly on gentis. "heating to give off nitria oxides,
F@30 + HO
KO
(g) Sawdust, which consists mainly of cellulose, can be oxidised by dropping pure nitric acid on to the warm dry solid. The sawdust datéhou fire, burning strongly, and olonda of brown. nitrogen dicocide fumes are evobred. Carbon...... élioxide and stein are also given öff.,
Questions for next week (22)
1 Describe the laboratory preparation of nitrie`
Acid. Explain why the liquid so obtained is yellow. in colour, and how this coloration may be removed, Explain carefully how you would show that nitric acid containa hydrogen, nitrogen and oxygen. How is nitrous oxide prepared and collected in the laboratory? As this gas fre=lights a glowing splinter' D
how would you distinguish it from
LIBRA
When dola concentrated nitris asid is diluted with its own Volume of water and 10 than
colourless me, nitric oxide, is evolved which
6. Underline the correct word in the brackets
We waited (to, for, on, st) the tram.
b) Es ie gaffaring (at, of, from, by) malaria. (0) The man is now free (of, from, at, in) debt.
d) I prefer tea (from, tomat, of) coffee.
●). He has a mother and two sistere (beside,
besides) other relatives.
(f) Ky pencil ie different (from, of,
yours.
to, with)
(e) Shu le proud (with, st, of, by) his won. (h) He là very careful (for, at, of) his health. (1) Look (to, out, at, for) this beautiful picture. (3) The hottle is full (of, with, by) water
7. there necessary, put capital letters and punctuation
(aarks, into these senteness, write them out againi
they boys name was henry
wait there is a dar comine
christaas comes in december
Chursday is the fifth day of the week
la quí th' sells butter gar tes and meat
each of the following groups of worde, underline
one that has the game sound as the word giver in capital lettera.
HAZ
(4) PEB
BOAT
3b111s nail, pole, pilg, kneel
live, eight, hee, breathe, she gala, bathe, laugh, love, hall. pes, beach, set, bread, gre sek, told, thought, how, what i
8. Put the words in the right order.
sentence in the space.
Write out each
asked
the
«) him, to," cone, ne, set
(b) -France; 1a, Paris, că
1/averyday,,send,
to do
(e)
OKY 1911?
100 m, of this gas were heated with a polis: of sodium in a suitable apparetús, and on sooling to the origin) conditions of temperature and pressure, it was found that the residual gas pure. nitrogen and that its volzam was 100 mi. The vapour density of the original-gas sta found to be about 21; what is its probable formula?
The maid cleans the room every morning.
Re has sent the letters.
Everybody hears their quarrel.
They may keep it for two weeka.
A boy brings the newspaper to our office everyday.
10. Turn the following dentences into questions like
the given example:
Example: You have not seen him,
You have seen him,
(a) This clock is useful;
(b) She did not forget it,
(c) They will come to-morros,
have you?
hev ́n't you?
(a) John can run fast,
(e) The boy has not broken the window,
Answers TEST 19
Anar to verb they did, (c) he doesn't, (d) they
are, (e) he couldn't.
2. (1) interesting, (2) absent, (3) he. (4) mas, (5) then, (6) she, (7) else, (8) anything. (9) asked, (10) recess.
3. (*) freeze, (b) badges, (c) bird, (d) X, {9}/%.
(r) cane, (g) good, (h) mix.
4.
us These, Everyone, The other, one.
當您雎钅
(b) were, (c) are, (d) is, (8) is, (f) is.
(a) alone, (b) tried, (c) herself, (d) Ho, (e)
anked.
7. (a) except, (b) as early as possible, (c) to Tou,'
house, (d) was thinking, (e) shop,(a)hurriedly. (b) all at once.
8. (1) met (2) was, (3) not only boasted, (4) maas, (5) moved, (6) am, (7) said," (8) am. (9) like, (10) replied, (11) start.
(a) +Xb), (6) 1 (8), (0)
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