Acids, Bases and Salts Generix Content - Acids, Bases and Salts
HOME

EXAMS

JAMB

WAEC

CONTENTS

SIGN IN

JOIN NOW
"Acids, Bases and Salts" question number distribution across years
loading...
Search "Acids, Bases and Salts" on the following sites online
 
Chemistry index on skoool nigeria
 
WAEC questions for "Chemistry :: Acids, Bases and Salts"
Q1

Salts that contain water of crystallization are said to be

A

anhydrous

B

deliquescent

C

efflorescent

D

hydrated

E
Q2

Which of the following dilute acids does not react with metals to liberate hydrogen?

A

CH3COOH3(aq)

B

HCl(aq)

C

H2SO4(aq)

D

HNO3(aq)

E
Q3

Which of the following compounds is not a soluble salt?

A

Zn(OH)NO3

B

KAl(SO4)2

C

KCr(SO4)2

D

(NH4)2Fe(SO4)2

E
Q4

Which of the following hydroxide will readily dissolve in water?

A

Cu(OH)2

B

NaOH

C

Pb(OH)2

D

Zn(OH)2

E
Q5

Which of the following acids forms normal salts only?

A

Tetraoxosulphate (VI) acid

B

Tetraoxosulphate (V) acid

C

Trioxonitrate (V) acid

D

Trioxosulphate (IV) acid

E
Q6

Which of the following salts is insoluble in water?

A

Pb(NO3)2

B

Na2CO3

C

AgNO3

D

AgCl

E
Q7

When concentrated H2SO4 is added to NaCl(s), the gas evolved

A

bleaches damp blue litmus paper

B

forms a white precipitate with AgNO3(aq)

C

forms a white precipitate with BaCl2(aq)

D

turns red litmus paper blue

E
Q8

The colour of phenolphthalein indicator in dilute HNO3(aq) is

A

colourless

B

orange

C

pink

D

purple

E
Q9

An aqueous soluition of CaCl2 is

A

acidic solution

B

alkaline solution

C

a buffer solution

D

a neutral solution

E
Q10

Which of the following compounds would dissolve in water to give a solution whose pH is less than7?

A

Al(NO3)3

B

KNO3

C

N2O

D

NH3

E
Q11

A solution of a salt was acidified with HCl. When a few drops BaCl2 solution were added, a white precipate was formed. Which of the following anions is present in the salt? 

A

CO32-

B

NO3-

C

SO42-

D

SO32-

E
Q12

When air is successively passed through Sodium hydroxide solution, alkaline pyrogallol an then concentrated tetraoxosulhpate (VI) acid, its remaining components are

A

oxygen and water vapour

B

oxygen and nitrogen

C

carbon (IV) oxide and noble gases

D

nitrogen and noble gases

E
Q13

In which of the following compound(s) will heat be absorbed on adding water?

I    KNO3

II  Concentrated H2SO4

III NH4Cl

A

I only

B

III only

C

I and III only

D

II and III only

E
Q14

Consider the reaction represented by the equation: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l) .In the reaction above CO2 acts as

A

an acidic oxide

B

an oxidizing agent

C

a basic oxide

D

a dehydrating agent

E
Q15

Which of the following compound is a basic salt?

A

Mg(NO3)2

B

(NH4)2SO4

C

K4Fe(CN)6

D

Zn(OH)Cl

E
Q16

What process is illustrated below? 
  H2O  
S(s)  ↔ S(aq)

A

Decomposition of solid

B

Melting of solid

C

Formation of saturated solution of a solid

D

Sublimation of a solid

E
Q17

A solution of a salt X reacts with  AgNOsolution to give a white precipitate which dissolves in excess aqueous ammonia. X contains

A

Cl-

B

Pb2+

C

SO2-

D

Zn(g)+

E
Q18

In four seperate experiments the same quantity of magnesium ribbon was added to an excess hydrochloric acid. In which of the experiment will hydrogen be given off rapidly?

Experiment Volume of acid (cm3) Concentration of acid (mol dm-3)
W 10 1.0
X 20 0.5
Y 30 2.0
Z 50 2.0

A

W

B

X

C

Y

D

Z

E
Q19

Which of the following aqueous solutions turns red litmus to blue?

A

NaCl

B

CH3COONa

C

AlCl3

D

NH4Cl

E
Q20

Which of the following methods can not be used to distiguish between a strong and a weak acid?

A

Conductivity measurement

B

Measurement of pH

C

Measurement of heat of neutralization

D

Action on iodide paper

E
Q21

The indicator used in the neutralizing CH3COONa and NaOH solutions has a pH range of

A

3 - 5

B

7 - 8

C

8 - 10

D

10 - 12

E
Q22

When aqueous ammonia is added to one of the following solutions, a white precipitate which dissolves in excess ammonia is formed. Identify the solution

A

ZnCl2(aq)

B

pb(NO3)2(aq))

C

CuSO4(aq)

D

FeSO4(aq)

E
Q23

Which of the following absorbs moisture from the atmosphere and dissolves in it?

A

FeCl3

B

MgSO4 .7H2O

C

Na2SO4

D

KCl

E
Q24

Which of the following industrial processes is chlorine not used?

A

Production of polyvinylchloride (PVC)

B

Manufacturing of hychloric acid

C

Manufacturing of common salts

D

Manufacturing of domestic bleach

E
Q25

HNO3 does not usually react with metals to liberate hydrogen because HNO3 is

A

is a strong acid

B

a corrosive acid

C

an oxidizing agent

D

a nitrating agent

E
Q26

Which of the following is not an acid anhydride?

A

P2O5

B

NO2

C

SO2

D

CO

E
Q27

NaHCO3(aq) can be distinguished from Na2CO3(s) by the action of

A

dilute hydrochloric acid

B

carbon (IV) oxide

C

aqueous ammonia

D

heat

E
Q28

What process is involved in the reaction represented by the following equation

AlCl3(s) + 3H2O(l) → Al(OH)3(s) + 3HCl(g)

A

Dehydration

B

Hydrolysis

C

Double decomposition

D

neutralization

E
Q29

A salt that absorbs moisture from the atmosphere without forming a solution is said to be

A

efflorescent

B

deliquescent

C

hygroscopic

D

insoluble

E
Q30

Which of the following pairs of salts undergo hydrolysis?

A

AlCl3 and NH4Cl

B

AlCl3 and NaCl

C

FeCl3 and KCl

D

Na2SO4

E

K2SO4

Q31

Which of the following salts is not prepared by precipitation?

A

Lead (II) trioxocarbonate (IV)

B

Barium trioxocarbonate (IV)

C

Sodium trioxocarbanate (IV)

D

Calcium trioxocarbonate (IV)

E
Q32

What are the values of x, y and z respectively in the following equation?

MnO2(g) + xHCl(aq) → MnCl2(aq) + yH20(l) +zCl2(g)

A

4, 1, 2

B

1, 2, 1

C

2, 1, 2

D

4, 2, 1

E
Q33

Which of the following substances will not produce effervescence with dilute hydrochloric acid?

A

copper (II) trioxocarbonate (IV)

B

Potassium hydrogentrioxocarbonate (IV)

C

Zinc granules

D

Sodium chloride

E
Q34

Two solutions containing Pb2+ and Al3+ respectively can be distinguished using

A

NaOH(aq)

B

NH3(aq)

 

C

conc. HNO3

D

conc. HCl

E
Q35

A solution of zinc chloride should not be stored in a container made of

A

tin

B

copper

C

aluminium

D

lead

E
Q36

Which of the following pairs of acids andbases will produce a solution with pH less than 7 at equivalence point?

A

HNO3 and NaOH

B

H2SO4 and KOH

C

HCl and Mg(OH)2

D

HNO3 and KOH

E
Q37

Aqueous copper (II) tetraoxosulphate (VI) was electrolysed using the following pairs of electrodes. In which case was there a decrease in the mass of the anode?

  Cathode Anode
A Graphite Graphite
B Platinum Platinum
C Copper Copper
D Graphite Platinum

A

graphite, graphite

B

platinum, platinum

C

copper, copper

D

Graphite, platinum

E
Q38

Which of the following salts is readily soluble in water?

A

PbCl2

B

Pb(NO3)2

C

PbSO4

D

PbCO3

E
Q39

When ammonium trioxocarbonate (IV) solution is added to separate solution of calcium, zinc and sodium salts, precipitate could be formed in case of

A

calcium only

B

zinc only

C

calcium and zinc only

D

sodium and zinc only

E
Q40

Which of the following acid is dibasic?

A

Hydrochloric acid

B

Trioxosulphate (IV) acid

C

Dioxonitrate (III) acid

D

Ethanoic acid

E
Q41

Bees inject an acidic substance when they sting. Which of the following chemicals could be used to treat the bee sting?

A

CH3COOH

B

NaHCO3

C

C2H5OH

D

H2O2

E
Q42

Which of the following salts can be prepared by reacting the metal with dilute H2SO4?

A

CuSO4

B

MgSO4

C

BaSO4

D

PbSO4

E
Q43

Which of the following solutions will give precipitate with dilute tetraoxosulphate (VI) acid?

I   Lead (II) trioxonitrate (V) solution

II  Barium chloride solution

III sodium chloride solution

A

I only

B

II only

C

I and II only

D

II and III only

E
Q44

Substance Q reacts with cold water to form a solution which turns red litmus paper blue. Sustance Q could be

A

zinc

B

phosphorus

C

lead

D

sodium

E
Q45

What term is used to describe an oxide whose aqueous solution turns blue litmus paper red?

A

Strong electrolyte

B

Acid anhydride

C

Amphoteric oxide

D

Basic oxide

E
Q46

Which of the following processes involves neutralization?

A

Hardening of oils

B

Souring of milk

C

Charring of sugar

D

Liming of soil

E
Q47

Sea shells contains mainly CaCO3. Calcium oxide can be prepared from sea shells by

A

adding dilute acid

B

heating at a high temperature

C

reduction with CO

D

adding dilute NaOH(aq)

E
Q48

Consider the equilibrium  reaction below. 2SO2(g) + O2(g) → 2SO3(g) ; ΔH = -Xkj mol-1. The amount of sulphur (IV) oxide produced will incerease if

A

the pressure is decreased

B

more heat is applied

C

the temperature is reduced

D

a catalyst is added

E
Q49

Which of the metals cannot displace Y from an aqueous solution of its salt?

A

V

B

W

C

X

D

Z

E
Q50

The major factor considered in selecting a suitable method for preparing a simple salt is

A

crystalline form

B

melting point

C

reactivity with dilute acids

D

solubility in water

E
Q51

Which of the following acids forms normal salts only?

A

Tetraoxosulphate (VI) acid

B

Trioxosulphate (IV) acid

C

Tetraoxophosphate (V) acid

D

Trioxonitrate (V) acid

E
Q52

A substance is said to be hygroscopic if its absorbs

A

water from the atmosphere to form salt solution

B

heat from the surrounding

C

carbon (IV) oxide from the atmosphere

D

moisture from the atmosphere without dissolving

E
Q53

Which of the following substances increases in mass when heated in air?

A

Sodium chloride

B

Iodine crystals

C

magnesium ribbon

D

copper (II) oxide

E
Q54

Which of the following salt solution will have a pH of 7?

A

NaCl(aq)

B

Na2CO3(aq)

C

Na2SO4(aq)

D

NaHSO4(aq)

E
Q55

CuSO4. 5H2O can be obtained from an aqueous solution of copper (II) tetraoxosulphate (VI) by

A

evaporation to dryness

B

using chromatography

C

precipitation

D

crystallization

E
Q56

Which of the following compounds will leave a metal residue when heated?

A

Cu(NO3)2

B

AgNO3

C

K2CO3

D

CaCO3

E
Q57

A visible change is observed when a strip of iron is placed in an aqueous solution of

A

FeSO4

B

ZnSO4

C

CuSO4

D

MgSO4

E
Q58

Which of the following set of reagents react to produce hydrogen?

A

Zinc and concentrate trioxonitrate (V) acid

B

Water and calcium dicarbide

C

Copper and dilute hydrochloric acid

D

magnesium and dilute tetraoxosulphate (VI) acid

E
Q59

Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution?

A

Copper tunnings

B

Copper (II) trioxocarbonate

C

Copper (II) oxide

D

Copper alloy

E
Q60

In which of the reactions represented by the following equations is HNO3 behaving as a typical acid?

A

CaO + 2HNO3 → Ca(NO3)2 + H2O

B

Cu + 4HNO3 → Cu(NO3)2

C

S + 6HNO3 → H2SO4 + 6NO2 + 2H2O

D

P + 5HNO3 → H3PO4 + 5NO3 + H2O

E