1979-04-26 — Page 36

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.

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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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