1984-04-06 — Page 31

育教僑華頁三第張八第日六初月三年子甲歷夏

1984

中學會考試題預習專欄

化學 (廿九)

明德出版社朱宏林提供資料

CHEMISTRY (29)

REGINALD W. CHU

MILL & DALE PRESS LTD.

1. Which of the following

is not a property of. cone sulphuric acid? A. A dehydrating

agerit

B. A non-volatile acid C. An oxidizing agent D. A drying agent E.Atypical strong:

"acid

「Which of the following gases may be collected by displacing air downwards (or upward delivery)?

(1) nitrogen monoxide

(2)

gas

:chlorine gas

ethane gās.

(4) hydrogen gas

(h) only

B. (1) and

only

and (4) only

D.(a) (4) only:

£. (1), (3) and (4)

only A.certain ion has 23 electrous and a. pass number of 56. If the charge of the ion is 43, then the number of neutrons in the nucleus is

A. 33

B. 79 D.26

C. 21

E. 30

P and Q have

compositions

the below:

No. of No. of

No. of

|protons neutrons electrons:

.P..

11.

12.

10

·∙12

12

10

"P and") 'are BEST

described as

A. isotopes

B. cations:

C. allotropes

anious.

E. noble elements 5. The electronic

⠀⠀configuration of the

elements X and Y. are. (2.8.8.2) and (2.8.7) :respectivelyn A

compound Zia forme d between x and Y. Which of the following.

statements about Z is. INCORRECT? AN

A. The most probable

formula of Z is XY2

B. Z is formed by

electron transfer. C. Z is volatile. D. Z conducts.

electrocity when it is in the molten state.

E. Z is a solid. Which of the following

statements about the Periodic Table is INCORRECT?:

A. The elements with

similar chemical. properties are in the same vertical

group.

There are more metals than :non-metals.

C. They are listed in the increasing order of atomic :weights.

The most reactive non-metals are found in the top right-hand corner of the table.

The melting points and the boiling

: points of the

celements increase

down a group,

The shape of ammonia molecule can be

described as

A. linear

B. tetrahedral

C. angular

D. pyramidal EV-shaped

"Diamond and graphite are different forms of the same element carbon.".

Which of the following: is/are evidence-of-the truth of this statement?

(1) Both are similar

in appearance.

(2) Both have the

same melting point...

(3) Both conduct.

electricityn

(4) A given mass off

either will yield

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the same mass of carbon dioxide on

complete combus- tion.

(4) only

B. (1) and (2) only and (4) only 0. (3) D. (2) and (3) only B. (1), (2) a

and (4)

only

9. At 25. and 770 mollg

of pressure, 16 cm of oxygen number of the same number of: molecules as

of hydrogen

B.4cm - of carbon:

dioxide

C.10cm

of helium -3: D. 9 cm of water

vapour

E. 14cm) of nitrogen 10. When anhydous ...

iron(II) sulphate is heated strongly, the reaction taking place is represented by the. following equation: “FeSO, ( s ) ~→→F€ 20z(s)

12.

+50¿(8) +SO(g)

what would be the volume of the gaseous

products, measured at

st.p.. on heating 3.04 g of iron(II) sulphate strongly2:

112 cm3 224cm-

336 cm

D. 448 心如

E. 56 cm

In a particular experiment 20cm- atgageous. element X. combines with 30 cm- of another gaseous element Y to give

10

cm of a gaseous product Z. If both

X and, Yare diatomic, what will be the most

Cable formula of

Z?

C.XY

mixture consisting

of 20

of hydrogen

cm

10 cm

of methane and

50.cm

3

of: oxygen

exploded in an

eudiometer. what

would be the: volume

of the gas(es) left behind after: explosion? (All

五期星

volumes were measured at the same tempera- ture:aud pressure.)

A. 20 cm. B.30 cm

C. 40 cm D..50 cm

E. 60cm

5.74 g of a hydrated metallic sulphite of. formula.

là MSD, KHO,

(where 1 denotes the metal) gives 3.22 of anhydrous walton heating. What is the value of x in the formula?

D.

3

Which one of the

lowing compounds

NOT yield oxygen on heating?

A. Potassium nitrate B. Copper(II) nitrate C. Silver(11) nitrate D. Aumonium nitrate E. Lead(II) nitrate

15. An excess of powdered zinc carbonate is added into dil H50

until effervescence stops. The pll of the solution.

A.. increases

about 12.

B. increases.

about 78

C. decreases. to.

about 7.

D. decreases.

about 3

E. remains the same. 16. Which of the follow-

ing acids will form two series of acid salts with sodium hydroxide?

"A NсOONI

H2SO HPO

E. CH COOH

Which of the follow=

ing substances, when

dissolved in water;

turns, blue litmus red?

NIC

Na, CO

C. KNO3

日六月四年四八九一曆公年三十七國民華中

D. CH COONa

F. Na 50,

18. A stud has spilled.

isome concentrated...

sulphuric acid on his hand. The first thing he has to do is to wash his affected hand with M

A. sodium hydroxide

solution :

B. dilute sodium

hydrogencarbonate

C. vinegar D: water

E. barium chloride

solution

19.wnat volume of 5 M

sulphuric acid must be diluted with water in order to prepare 250 cm3 of 0.1 M sulphur acid? A.0.5cm

B. 2.5 cm

c. 5.0 cm?

D.25cm-

E. 50 cm3

20. When 25cm of molar

sodium bydroxide is

3 mixed with 25 cm

cm of molar sulphuric acid, the resulting consists of water and

A.sodium hydrogen

21.

sulphite:

B. sodium sulphite C. sodium hydrogen

sulphate.

D. godium sulphate E

sodium sulphide

On adding sodium hydroxide solution into a colourless aqueous solution x aprecipitate in: observed, which ---

annonia solution and sodium hydroxide: solution. Which of the following cations

a, solves in both

is most probably

present in the solution X.

Zn

PbT

22

E. Fe

Ag of an oxide of. metal K (oxidation: number +2) reacts. with excess dilute hydrochloric acid to give 9.5 g of its chloride.The. relalive.atomic mass: of X is most probably A. 12.

B. 24 D. 48

CL 36 E. 23

23. 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. Y cau; remove oxygen from the oxide of X. Basing on the above. information, arrange the three metals in decreasing order.of. their reducing power. A X, Y, Z

B. 2, X, Y

C. X, 7, Y

D. Z, Y, X

E. Y, Z, X

24。 Which of the follow-

ing "oxides, at red hot, can be reduced: by carbon but not by hydrogen?

A. copper(II) oxide B. Jead(IT) oxide. C. calcium oxide D. zinc(II) oxide E. aluminium oxide:

25. The aqueous solution

of a compound X gives

a white precipitate

on adding into it acidified silver

solution, and nitrate gives an alkaline gas, when heated with": godium hydroxide solution. The compound X is most probably.

A, ammonium bromide B. ammonium sulphate C.ammonium.

potassium iodide

E. ammonium chloride

ANSWERS:

1. E 2. C 3. E4. B 5. 06. C 7. D 8. A. 9. E 10. D 11. B12, B 13. D 14 D15. B 16. D

17 A 18. D 19. C 20. C 21 A 22. B 25. D 24. 25. E

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