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TOPIC 7: ACIDS AND BASES9Which of the following is true about weak alkali?Antara berikut yang manakah benar tentang alkali lemah?

A

The pH value is more than 7Mempunyai pH lebih daripada 7

BUnable to neutralize acidTidak boleh meneutralkan acid

CChange blue litmus paper to redMenukarkan kertas litmus biru ke merah

DIonizes partially in water to produce hydroxide ionsMengion separa dalam air menghasilkan ion hidroksida

1. Which of the following solution has the lowest pH value?Antara larutan berikut, yang manakah mempunyai nilai pH paling rendah?

AEthanoic acid 0.1 mol dm-3Asid etanoik 0.1 mol dm-3BHydrochloric acid 0.1 mol dm-3Asid hidroklorik 0.1 mol dm-3CAmmonia solution 0.1 mol dm-3Larutan ammonia 0.1 mol dm-3DSodium hydroxide solution 0.1 mol dm-3Larutan natrium hidroksida 0.1 mol dm-3

The following equation shows the reaction between hydrochloric acid and sodium hydroxide solution. Persamaan berikut menunjukkan tindak balas antara asid hidroklorik dengan larutan natrium hidroksida.

HCl + NaOH NaCl + H2O

What is the volume of 1.0 mol dm-3 of sodium hydroxide solution required to neutralise 25 cm3 of 1.0 mol dm-3 of hydrochloric acid?Apakah isipadu larutan natrium hidroksida 1.0 mol dm-3 yang diperlukan untuk meneutralkan 25 cm3 asid hidroklorik 1.0 mol dm-3 ?

A12.5 cm3B25.0 cm3C40.0 cm3D50.0 cm3

2Which of the following acids is a weak acid?Antara asid berikut, yang manakah merupakan asid lemah?

ABCDHydrochloric acidEthanoic acidSulphuric acidNitric acid

47Diagram 15 shows the set up of apparatus for the titration of potassium hydroxide solution with sulphuric acid.Rajah 15 menunjukkan susunan radas bagi pentitratan larutan kalium hidroksida dengan asid sulfurik.

20 cm3 of 0.1 mol dm-3 potassium hydroxide solution20 cm3 larutan kalium hidroksida 0.1 mol dm-3 mol dm-3 of sulphuric acidAsid sulfurik 0.1 mol dm-3

Diagram 15Rajah 15

What is the total volume of the mixture in the conical flask at the end point ?Apakah jumlah isipadu campuran di dalam kelalang kon pada takat akhir ? A10 cm3B20 cm3C30 cm3D40 cm3

1. The sting of jelly-fish is alkaline and causes pain.Which of the following substances is the most suitable to be used to treat the pain?

Sengatan obor-obor adalah beralkali dan menyebabkan kesakitan.Antara bahan berikut, manakah yang paling sesuai digunakan untuk merawat kesakitan tersebut?

AFlourTepung BVinegarCukaCCooking oilMinyak masak DBaking powderSerbuk penaik7Which solution shows the highest pH value?Larutan manakah menunjukkan nilai pH tertinggi?

A0.5 mol dm-3 sulphuric acid 0.5 mol dm-3 acid sulfurik

B0.5 mol dm-3 ethanoic acid .0.5 mol dm-3 asid etanoik .

C0.5 mol dm-3 aqueous ammonia0.5 mol dm-3 ammonia akueous

D0.5 mol dm-3 sodium hydroxide solution 0.5 mol dm-3 larutan natrium hidroksida

7Which solution shows the highest pH value?Larutan manakah menunjukkan nilai pH tertinggi?

A0.5 mol dm-3 sulphuric acid 0.5 mol dm-3 acid sulfurik

B0.5 mol dm-3 ethanoic acid .0.5 mol dm-3 asid etanoik .

C0.5 mol dm-3 aqueous ammonia0.5 mol dm-3 ammonia akueous

D0.5 mol dm-3 sodium hydroxide solution 0.5 mol dm-3 larutan natrium hidroksida

28Which of the following statement correctly describes a strong alkali? Antara pernyataan berikut, yang manakah betul tentang alkali kuat ?

IHas a low pH value Nilai pH yang rendah

IIIonises completely in waterMengion dengan lengkap dalam air

IIIHas a high concentration of hydroxide ionsMempunyai kepekatan ion hidroksida yang tinggi

IVExist as molecules in waterWujud sebagai molekul dalam air

AI and II I dan II

BI and IVI dan 1V

CII and III II dan III

DIII and IVIII dan IV

44The equation shows the reaction between sulphuric acid and potassium hydroxide. Persamaan menunjukkan tindakbalas di antara asid sulfurik dan kalium hidroksida.

H2SO4 + 2KOH K2SO4 + 2H2O

What is the volume of 1.0 mol dm-3 potassium hydroxide solution which can neutralise 25.0 cm3 of 1.0 mol dm-3 sulphuric acid? Berapakah isipadu 1.0 mol dm-3 larutan kalium hidroksida yang boleh meneutralkan 25.0 cm3 1.0 moldm-3 asid sulfurik ?

A12.5 cm3

B25.0 cm3

C50.0 cm3

D70.0 cm3

6Which of the following is a weak acid?Asid yang manakah asid lemah?

ANitric acidAsid nitrikBEthanoic acidAsid etanoik CSulphuric acidAsid sulfurikDHydrochloric acidAsid hidroklorik47Which of the following acidic solutions contains the highest number of hydrogen ions?Antara larutan asid berikut yang manakah mempunyai bilangan ion hydrogen yang paling tinggi?

A

B

C

D100 cm3 hydrochloric acid 0.1 mol dm-3100 cm3 asid hidroklorik 0.1 mol dm-3

50 cm3 sulphuric acid 0.2 mol dm-350 cm3 asid sulfurik 0.2 mol dm-3

100 cm3 ethanoic acid 0.2 mol dm-3100 cm3 asid etanoik 0.2 mol dm-3100 cm3 nitric acid 0.1 mol dm-3100 cm3 asid nitrik 0.1 mol dm-3

TOPIC 7:ACID AND BASESTrial kedah 200940A beaker contains 100 cm3 of 0.5 mol dm-3 sodium hydroxide solution. Calculate the number of moles of sodium hydroxide in the beaker.Sebuah bikar mengandungi 100 cm3 larutan natrium hidroksida 0.5 mol dm-3. Hitung bilangan mol bagi natrium hidroksida dalam bikar.

ABCD0.050.505.0050.0

41The following equation represents the reaction between hydrochloric acid and sodium hydroxide.Berikut ialah persamaan yang mewakili tindak balas antara asid hidroklorik dan natrium hidroksida.NaOH + HCl NaCl + H2O

What is the mass of sodium chloride formed when 100 cm3 of 0.5 mol dm-3 hydrochloric acid reacts with excess sodium hydroxide solution?Apakah jisim natrium klorida yang terbentuk apabila 100 cm3 asid hidroklorik 0.5 mol dm-3 bertindak balas dengan larutan natrium hidroksida berlebihan?[Relative atomic mass: Na = 23, Cl = 35.5]

27Which of the following solution has the lowest pH value?

AEthanoic acid 0.1 mol dm-3BHydrochloric acid 0.1 mol dm-3CAmmonia solution 0.1 mol dm-3 DSodium hydroxide solution 0.1 mol dm-3

37 The chemical equation shows the reaction between sulphuric acid and potassium hydroxide.

H2SO4 + 2KOH K2SO4 + 2H2O

What is the volume of 0.5 mol dm-3 needed to neutralise 10.0 cm3 of 0.5 mol dm-3 sulphuric acid?

A15.0 cm3B17.5 cm3C20.0 cm3D60.0 cm3

21Which particle is present in glacial ethanoic acid ?Yang manakah wujud dalam asid etanoik glasial ?

AH+

BOH-

CCH3COO-

DCH3COOH

22An aqueous solution of Y has a pH value of 1.Which is true about Y? Larutan akues Y mempunyai nilai pH 1.Yang manakah benar tentang Y?

AY produces a low concentration of H+ ion in waterY menghasilkan kepekatan H+ ion yang rendah di dalam air

BY reacts with an alkali to produce salt and waterY bertindak balas dengan alkali menghasilkan garam dan air

CY turns colourless phenolphthalein to pinkY menukarkan merah jambu fenoltalein kepada tak berwarna

DY ionizes partially in waterY mengion separa di dalam air

23Which ionic equation represents the reaction between sulphuric acid and aqueous sodium hydroxide? Yang manakah ialah persamaan ion yang mewakili tindak balas di antara asid sulfurik dengan natrium hidroksida akues?

AH+ + OH- H2O

BH+ + H2O H3O+

C2Na+ + SO42- Na2SO4

D2NaOH + H2SO4 Na2SO4 + 2H2O

41A farmer discovered that his vegetables were not growing well because the soil was acidic. Which of the following substances can be used to overcome the problem?

Seorang petani mendapati sayurannya tidak tumbuh subur kerana tanahnya berasid. Antara bahan berikut, yang manakah boleh digunakan untuk menyelesaikan masalah tersebut?

A

Zinc oxideZink oksida

BCalcium oxideKalsium oksida

CSodium hydroxideSodium hidroksida

DMagnesium hydroxideMagnesium hidroksida

39Diagram 15 shows the set-up of apparatus for titration of sodium hydroxide solution with sulphuric acid.Rajah 15 menunjukkan susunan radas untuk pentitratan larutan natrium hidroksida dengan asid sulfurik

25 cm3 of 0.2 mol dm-3 natrium hydroxide solution25 cm3 larutan natrium hidroksida 0.2 mol dm-3Sulphuric acid 0.2 mol dm-3Asid sulfurik 0.2 moldm-3 Diagram 15 Rajah 15

What is the volume of sulphuric acid at the end point of the titrationBerapakah isipadu asid sulfurik pada takat akhir pentitratan

A12.5 cm3

B25.0 cm3

C 37.5cm3

D50.0 cm3

1Diagram 1 shows the information about two types of solutions A and B which are used to carry out titration with hydrochloric acid.Rajah 1 menunjukkan maklumat tentang dua jenis larutan A dan B yang digunakan untuk menjalankan pentitratan dengan asid hidroklorik.

Solution A : 50 cm3 of 1.0 mol dm-3 sodium hydroxide, NaOH Larutan A : 50 cm3 natrium hidroksida, NaOH 1.0 mol dm-3 Solution A : 50 cm3 of 1.0 mol dm-3 ammonium hydroxide, NH4OHLarutan B : 50 cm3 ammonium hidroksida,NH4OH 1.0 mol dm-3

Diagram 1Rajah 1

(a)(i)

What are the types of solutions A and B.Apakah jenis larutan A dan B.

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