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Chemistry Class X - Acids, bases and salts Revision

Total questions: 50

Worksheet time: 2hrs 40mins

Name
Class
Date
1.

True or false: a neutral solution has equal amounts of H+ and OH-.

a)

True

b)

False

2.
In a neutralization reaction, what are the products of a reaction between an acid and a base?
a)
Another acid and base
b)
Carbon dioxide and a salt
c)
Water and a salt
d)
Either two acids or two bases
3.

A substance is found to have the following characteristics:


Very bitter taste

Feels soapy to the touch

Produces OH- ions when dissolved in water


In what category would the substance be classified?

a)

acid

b)

base

4.

Basic oxide

a)

BaO

b)

P2O5

c)

ZnO

d)

CO2

5.

Which is NOT an amphoteric oxide?

a)

zinc oxide

b)

aluminium oxide

c)

lead (II) oxid

d)

sodium oxide

6.

Which of the followings is an acidic oxide?

a)

SO2

b)

H2O

c)

CO

d)

ZnO

7.

Potassium carbonate reacts with an acid Y to form potassium nitrate, water and carbon dioxide. What is the acid used for this reaction?

a)

HNO3

b)

H2SO4

c)

HCl

8.

Which indicator is colourless in acid and pink in alkali?

a)

Litmus

b)

Phenolphthalein

c)

Universal Indicator

d)

Methyl Orange

9.
Which food is the most acidic?
a)
bananas
b)
lemon juice
c)
orange juice
d)
fish
10.

... are used to neutralise acid in the stomach.

a)

Toothpastes

b)

Bacterias

c)

Antacids

d)

More strong acids

11.

After a compound X was added to water, the pH using indicator paper was less than 7. The resulting solution was added to some calcium carbonate and it was noted that effervescence took place. What could compound X be?

a)

HNO3

b)

MgO

c)

Na2O

d)

CaO

12.

According to Arrhenius, what is the definition of an ACID?

a)

a substance that contains hydroxide and ionizes to produce OH-

b)

a substance that contains hydrogen and ionizes to produce H+

c)

a substance that contains hydrogen and ionizes to produce OH-

d)

a substance that contains hydroxide and ionizes to produce H+

13.

Phosphoric Acid can be classified as a...

a)

monoprotic acid

b)

diprotic acid

c)

triprotic acid

d)

quadprotic

14.

An acid has a pH

a)

higher than 7

b)

lower than 7

c)

7

d)

greater than 14

15.

bleach is

a)

an acid

b)

a base

16.
Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
a)
strongly acidic
b)
slightly acidic
c)
strongly basic
d)
slightly basic
17.

NH3 is:

a)

a Bronsted Lowry base

b)

an Arrhenius base

c)

an acid

d)

both an Arrhenius and a Bronsted Lowry base

18.
Which of the following shows the correct conjugate acid base pair?
a)
HCI (acid) / H3O+ (conjugate base)
b)
HCI (acid) / CI- (conjugate base)
c)
HCI (base) / CI- (conjugate acid)
d)
HCI (base) / H3O+ (conjugate acid)
19.
CH3COOH dissociates partially and is reversible. Why?
a)
CH3COOH is a weak acid and H3O+ is strong conjugate base
b)
CH3COO- is a weak base and CH3COOH is strong conjugate acid
c)
CH3COOH is weak acid and CH3COO- is strong conjugate base
d)
CH3COOH is a weak acid and CH3COO- is a weak conjugate base
20.

H2O is amphiprotic, can act as acid or base. Which of the following is TRUE?

a)

H2O is only an acid because it can only donate a proton

b)

H2O is only a base because it can only accept a proton

c)

H2O can gain or lose a proton

d)

H2O can easily form hydronium ion, H3O+

21.

A Bronsted Lowry base:

a)

donates H+ to another substance

b)

accepts H+ from another substance

c)

produces H+

d)

produces OH-

22.
In this reaction...
CH3NH2 + H2O --> CH3NH3+ + OH-
CH3NH2 can be classified as which of the following? (HINT...follow the H+!!!)
a)
A Brønsted-Lowry base
b)
A Brønsted-Lowry acid
c)
A Lewis acid
d)
An Arrhenius acid
23.

HSO4-(aq)+H2O(l) → H3O+(aq)+SO42-(aq)

Identify the bronsted acid in the above reaction.

a)

HSO4-

b)

H2O

c)

H3O+

d)

SO42-

24.

HCl is:

a)

an Arrhenius acid

b)

a Bronsted Lowry acid

c)

both an Arrhenius and Bronsted Lowry acid

d)

both an acid and a base

25.
According to Lewis acid-base theory, a Lewis base is.....
a)
an electron pair acceptor
b)
an electron pair donor
c)
an oxidising agent
d)
a reducing agent
26.
According to which acid-base theory is a base a proton acceptor?
a)
Arrhenius
b)
Bronsted-Lowry
c)
Lewis
27.
What is the conjugate acid in the following equation?
a)
PO43- 
b)
HNO3 
c)
NO3- 
d)
HPO42-
28.

In the equation: HF + H2O ==> H3O+ + F-

a)

H2O is an acid and HF is the conjugate base.

b)

H2O is a base and HF is its conjugate acid.

c)

HF is a base and H3O+ is its conjugate acid.

d)

HF is an acid and F- is its conjugate base.

29.

What is the difference between a conjugate Brønsted–Lowry acid–base pair?

a)

Electron pair

b)

Positive charge

c)

Proton

d)

Hydrogen atom

30.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-5
d)
1-20
31.
Complete the sentence.
A substance that is more basic has a _____ pH than a substance that is acidic.
a)
lower
b)
higher
c)
the same
d)
none of the above
32.

In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship?

a)

Both of the solution are Bases

b)

Both of the solution are Acids

c)

The Baking soda is an acid and the Bleach is a base

d)

The baking soda is a base and the Bleach is an Acid.

33.

A pH of 3 is how many times more acidic than a pH of 5?

a)

2

b)

20

c)

10

d)

100

34.

A solution with a pH of 10 is mixed with an equal volume of a solution with a pH of 4. What would the pH of the mixture most likely be?

a)

10

b)

4

c)

40

d)

7

35.

Which of the following will change the red litmus paper to blue?

a)

Sodium hydroxide

b)

Hydrochloric acid

c)

Sulphuric acid

d)

Nitric acid

36.

Sodium hydroxide is used

a)

to make fertilisers.

b)

to make battery.

c)

to cure gastritis.

d)

to make detergent.

37.

The preparation process of soap from the reaction between palm oil and natrium hydroxide solution are known as

a)

Esterification

b)

Saponification

c)

Sulphonation

d)

Polymerization

38.

5 ml of solution of NaOH is completly neutralized by 4 ml of Hcl. If we take 10 ml of NaOH, the amount of Hcl required to neutralize it will be?

a)

4ml

b)

8ml

c)

12ml

d)

16ml

39.

Identify the gas released if a solution of sodium hydrogen carbonate is heated.

a)

H2

b)

CO2

c)

SO2

d)

HCO3

40.

What is the common name of calcium oxychloride?

a)

Bleaching powder

b)

Washing soda

c)

Baking soda

d)

Lime

41.

What is the correctly written chemical formula for the ionic compound, strontium oxide?

[Hint: strontium, Sr is in Group 2]

a)

Sr2O

b)

SrO2

c)

Sr2O2

d)

SrO

42.

Which of these products makes a cake spongy?

a)

Water

b)

Sodium Salt

c)

Carbon dioxide

d)

Acid

43.

What is the difference of water molecules between Gypsum and Plaster of Paris?

a)

2

b)

1

c)

1.5

d)

0.5

44.

TO REMOVE THE HARDNESS OF WATER WE USE

a)

WASHING SODA

b)

BLEACHING POWDER

c)

BAKING SODA

d)

NONE OF THE ABOVE

45.

BAKING POWDER CONTAIN BAKING SODA WITH

a)

TARTARIC ACID

b)

SULPHURIC ACID

c)

NITRIC ACID

d)

ALL OF THE ABOVE

46.

DRY SLAKED LIME FORMS BLEACHING POWDER BY ACTION OF GAS .NAME THE GAS

a)

CHLORINE

b)

HYDROGEN

c)

NITROGEN

d)

NONE

47.

------------IS USED IN SODA ACID FIRE EXTINGUISHER.

a)

BAKING SODA

b)

WASHING SODA

48.

Plaster of Paris hardens by-

a)

(a) giving of CO2

b)

(b) changing into CaCO3

c)

(c) combining with water

d)

(d) giving out water

49.

Antacids contain

a)

weak base

b)

Strong base

c)

Strong acid

d)

weak acid

50.

When CO2 is passed through lime water, it turns milky. the milkiness in due to formation of

a)

H2 O

b)

CaCO3

c)

CaO

d)

CO2

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