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Acids, Bases and Salts

Total questions: 70

Worksheet time: 1hrs 10mins

Name
Class
Date
1.

What are the properties of acids?

a)

Bitter taste, turn blue litmus paper red, pH greater than 7

b)

Sweet taste, turn red litmus paper blue, pH greater than 7

c)

Sour taste, turn blue litmus paper red, pH less than 7

d)

Salty taste, turn red litmus paper blue, pH less than 7

2.

What are the properties of bases?

a)

Sweet taste, slimy texture, and turn red litmus paper green

b)

Bitter taste, slippery feel, and turn red litmus paper blue

c)

Sour taste, rough texture, and turn blue litmus paper red

d)

No taste, dry texture, and turn blue litmus paper yellow

3.

What is the pH scale and what does it measure?

a)

The pH scale measures the temperature of a substance.

b)

The pH scale measures the color of a substance.

c)

The pH scale measures the weight of a substance.

d)

The pH scale measures the acidity or alkalinity of a substance.

4.

What is the pH of a neutral substance?

a)

10

b)

3

c)

5

d)

7

5.

What happens in a neutralization reaction?

a)

Hydrogen and an acid are formed

b)

Oxygen and a base are formed

c)

Water and a salt are formed

d)

Carbon dioxide and water are formed

6.

Give an example of a neutralization reaction.

a)

Acetic acid + Ammonia → Ammonium acetate + Water

b)

Sulfuric acid + Potassium hydroxide → Potassium sulfate + Water

c)

Nitric acid + Calcium hydroxide → Calcium nitrate + Water

d)

Hydrochloric acid + Sodium hydroxide → Sodium chloride + Water

7.

How are salts formed?

a)

Through the reaction between a base and a gas

b)

Through the reaction between an acid and a base

c)

Through the reaction between two acids

d)

Through the reaction between a base and a solid

8.

What is the chemical formula for table salt?

a)

C6H12O6

b)

CO2

c)

H2O

d)

NaCl

9.

Slaked lime is prepared by adding water to

a)

Bleaching powder

b)

Lime water

c)

Milk of lime

d)

Quicklime

10.

An aqueous solution turns red litmus solution blue . Excess addition of which of the following solution would reverse the change?

a)

Baking powder

b)

Lime

c)

Ammonium hydroxide solution

d)

Hydrochloric acid

11.

What is the molecular formula of sodium zincate ?

a)

NaZn(OH)3

b)

Na2ZnO2

c)

Na2Zn(OH)4

d)

NaZnOH

12.

Which one of the following can be used as an acid-base indicator by a visually impaired student

a)

Litmus

b)

Vanilla Essence

c)

Turmeric

d)

Petunia leaves

13.

CO2 is released by the action of dilute HCI on

a)

Ca(OH)2

b)

NaHCO3

c)

CaOCI2

d)

Ca(NO3)2

14.

The characteristics properties of an acid are due to the presence of (a)   ion

15.

Yellow colour tumeric turns into (a)   in akaline solution

16.

Methyl orange colour in acidic medium is

a)

Yellow

b)

Pink

c)

Red

d)

Orange

17.

Which of the following is not a mineral acid?

a)

Nitric acid

b)

Sulphuric acid

c)

Citric acid

d)

Hydrochloric acid

18.

Nitric acid reacts with sodium hydroxide solution to form a salt and water. Which of the following is the correct word equation?

a)

nitric acid + sodium hydroxide + water

b)

nitric acid + sodium hydroxide --> sodium nitrate + water

c)

salt + water --> nitric acid + sodium hydroxide

d)

sodium nitrate + water --> nitric acid + sodium hydroxide

19.

Indigestion tablets always contain

a)

acids

b)

antacids

c)

antibiotics

d)

indicators

20.

The lower the pH number the -------the acid

a)

Stronger

b)

Weaker

21.

When an acid is mixed with small quantity of water it is

a)

Dilute Acid

b)

Concentrated Acid

22.

True or False: Acids with a low pH and alkalis with a high pH are considered very dangerous.

a)

True

b)

False

23.
What are the formulas for the following?
--sulfuric acid--
--nitric acid--
a)
H2SO, HNO
b)
H2SO3, HNO3
c)
H2S, H3N
d)
H2SO4, HNO3
24.
Strong acids and bases...
a)
do not break apart into ions (non-electrolyte)
b)
partially break apart into ions (weak electrolyte)
c)
completely break apart into ions (non-electrolyte)
d)
completely break apart into ions (strong electrolyte)
25.
Identify the salt in the following equation:
Zn(OH)2 + HNO3   ---> H2O  + Zn(NO3)2
a)
Zn(OH)2
b)
HNO3
c)
H2O
d)
Zn(NO3)2
26.

Complete the following reaction:

H3PO4 + NaOH -->

a)

Na3PO4 + H2O

b)

Na +H2O

c)

Na3PO4 + H2

d)

Na3PO4 + H2O + CO2

27.

When an acid and base has been neutralized the pH will be?

a)

1

b)

4

c)

7

d)

10

28.

When HCl is added to pure water, which of the following will occur?

a)

the [H+] will increase

b)

the pH will decrease

c)

the [OH-] will decrease

d)

all of the above

29.
Which of the following is NOT a strong acid?
a)
HCl
b)
HClO5
c)
H2SO4
d)
HNO3
30.
The pH of a dilute base
a)
7
b)
14
c)
8
d)
6
31.

________________ is an example of an amphoteric oxide

a)

aluminium oxide

b)

carbon dioxide

c)

sulphur dioxide

d)

copper oxide

32.

1. An example of an acidic oxide is:

a)

MgO

b)

CO2

c)

BaO

d)

Na2O

33.
Which type of ion does a base produce when it is dissolved in water?
a)
oxide
b)
oxygen
c)
hydrogen
d)
hydroxide
34.
Which of the following word pairs correctly completes the sentence below?
_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.
a)
Acids; pH less than 7
b)
Acids; pH greater than 7
c)
Bases; pH greater than 7
d)
Bases; pH less than 7
35.

A sting from insect X has a pH of 6 and a sting from insect Y has a pH of 8. The table shows the pH of four substances.

Which substances are used to treat the two stings?

a)

A X = hydrochloric acid; Y = sodium hydroxide

b)

B X = sodium hydrogen carbonate; Y = vinegar

c)

C X = sodium hydroxide; Y = hydrochloric acid

d)

D X = vinegar ; Y = sodium hydrogen carbonate

36.

Which statement is not correct?

a)

A When a base reacts with an ammonium salt, ammonia is given off.

b)

B When an acid reacts with a base, neutralisation takes place.

c)

C When an acid reacts with a carbonate, carbon dioxide is given off.

d)

D When the acidity of a solution increases, the pH increases.

37.

Which equation for the reaction between sodium carbonate and dilute hydrochloric acid is correct?

a)

A Na2CO3(s) + HCl(aq) → NaCl(aq) + CO2(g) + H2O(I)

b)

B Na2CO3(s) + HCl(aq) → Na2Cl(aq) + CO2(g) + H2O(I)

c)

C Na2CO3(s) + 2HCl(aq) → NaCl(aq) + CO2(g) + H2O(I)

d)

D Na2CO3(s) + 2HCl(aq) → 2NaCl(aq) + CO2(g) + H2O(I)

38.

Which substance is the most acidic?

a)

A

b)

B

c)

C

d)

D

39.

The graph shows how the pH of soil in a field changes over time. At which point was the soil neutral?

a)

A

b)

B

c)

C

d)

D

40.

Ant stings hurt because of the methanoic acid produced by the ant.

Which substance could, most safely, be used to neutralise the acid?

a)

A

b)

B

c)

C

d)

D

41.

The diagram shows an experiment.

What happens to the pieces of litmus paper?

a)

A blue litmus paper - changes colour; red litmus paper - changes colour.

b)

B blue litmus paper - changes colour; red litmus paper - no colour change.

c)

C blue litmus paper - no colour change; red litmus paper - changes colour.

d)

D blue litmus paper - no colour change; red litmus paper - no colour change.

42.

Calcium phosphate is present in tooth enamel - its nature is

a)
basic
b)
acidic 
c)
neutral
d)
amphoteric
43.

Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the statement is true about the gas evolved

a)
it turns lime water milky
b)
it burns with a pop sound
c)
it changes the soln colorless
d)
it has a pungent smell
44.

A substance has a pH value of 8. It is most likely to be what?

a)

Strong acid

b)

Weak acid

c)

Strong base

d)

Weak base

45.

Which indicator is colourless in acid and pink in alkali?

a)

Litmus

b)

Phenolphthalein

c)

Universal Indicator

d)

Methyl Orange

46.

All bases are alkalies but all alkalies are not bases?

a)

Yes

b)

No

47.

A dibasic acid

a)

sulphuric acid

b)

nitric acid

c)

phosphoric acid

d)

hydrochloric acid

48.

In a sample of solution, when methyl orange is added as an indicator, the solution turns yellow in colour , then resulting solution could be

a)

HCl

b)

Salt

c)

NaOH

d)

water

49.

Plaster of Paris is obtained by heating:

a)

Gypsum

b)

Limestone

c)

Sodium chloride

d)

Acetic acid

50.

To which colour does phenolphthalein changes when we add it to an acid

a)

Pink

b)

Yellow

c)

Red

d)

Colourless

51.

What is meant by p and H in pH?

a)

Potenz and Hydrogen

b)

Potassium and Helium

c)

Phosphorous and Hydrogen

d)

Potenz and Helium

52.

Which of the acids are called king of chemicals?

a)

H Cl

b)

H2so4

c)

HNo3

d)

vinegar(acetic acid)

53.

What is the common name of calcium oxychloride?

a)

Bleaching powder

b)

Washing soda

c)

Baking soda

d)

Lime

54.

TO REMOVE THE HARDNESS OF WATER WE USE

a)

WASHING SODA

b)

BLEACHING POWDER

c)

BAKING SODA

d)

NONE OF THE ABOVE

55.
Chemical formula of baking soda is
a)
MgSO4
b)
Na2CO3
c)
NaHCO3
d)
MgCO3
56.

To relieve pain due to acidity, we can take

a)

sour milk

b)

lemon juice

c)

orange juice

d)

milk of magnesia

57.

Ant sting has?

a)

Tartaric acid

b)

Methanoic acid

c)

Citric acid

d)

Acetic acid

58.

Na2CO3 . 10H2O is

a)

washing soda

b)

baking soda

c)

bleaching powder

d)

tartaric acid

59.

What plant Is used to make litmus solution?

(a)  

60.

Krutika has put a solution on both red and blue litmus paper but to her surprise, None of them change the color. What could the nature of the solution be?

(a)  

61.

We put __________ Solution On ant bites because it contains ____________.

a)

phenolphthalein, sulphur dioxide

b)

Calamine Solution, zinc carbonate

c)

Sodium chloride, magnesium hydroxide

d)

None Of the above

62.

What Is the Chemical name for Baking Soda?

(a)  

63.

Milk of magnesia contains .............................

a)

Sodium chloride

b)

Magnesium chloride

c)

Magnesium hydroxide

d)

Ammonium hydroxide

64.

Which of the following salts does not contain water of crystallisation?

a)

Plaster of paris

b)

Baking soda

c)

Washing soda

d)

Gypsum

65.

Which equation is balanced?

a)

H2SO4 + NaOH --> Na2SO4 + H2

b)

H2SO4 + 2NaOH --> Na2SO4 + H2

c)

H2SO4 + 2NaOH --> Na2SO4 + H2O

d)

H2SO4 + 2NaOH --> Na2SO4 + 2H2O

66.

Complete this equation:

sulfuric acid + potassium hydroxide -->

a)

potassium oxide + hydrogen

b)

potassium chloride + water

c)

potassium sulfate + hydrogen

d)

potassium sulfate + water

67.
How are metal oxides formed?
a)
When metals react with oxide.
b)
When metals react with water.
c)
When metals react with air.
d)
When metals react with oxygen.
68.

which of the following is used for dissolution of gold?

a)

Hydrochloric acid

b)

Sulphuric acid

c)

Nitric acid

d)

Aqua regia

69.

Chlor-Alkali process ...... are produced

a)

NaOH, Cl2

b)

NaOH, Cl2,H2

c)

NaOH, Cl2, N2

d)

None of these

70.

Distilled water is --- in nature.

a)

neutral

b)

acidic

c)

basic

d)

salty

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