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SEM1 Module 2 fundamental of Analytical Chemistry

Total questions: 25

Worksheet time: 50mins

Name
Class
Date
1.

The substance which releases H+ in solution is known as -------

a)

Base

b)

Acid

c)

Buffer

d)

Water

2.

The substance which releases OH- into solution is known as ------

a)

Acid

b)

Base

c)

Neutral

3.
According to which theory is a base a substance which produces OH- ions in water?
a)
Arrhenius
b)
Bronsted-Lowry
c)
Lewis
4.

When an equal strength acid and base are mixed, what kind of chemical reaction occurs?

a)

Neutralization

b)

Combustion

c)

Oxdation

d)

Decomposition

5.
According to Bronsted-Lowry acid base theory, an acid is a.....
a)
Proton donor
b)
Proton acceptor
c)
Produces H+ when added to water
d)
Made of H+
6.
A compound that donates H+ ions is 
a)
A Bronsted-Lowry Acid
b)
An Arrhenius Acid
c)
A Bronsted-Lowry Base
d)
An Arrhenius Base
7.

In the equation below, what is the Bronsted Lowry acid?

HCl + NH3 --> Cl- + NH4+

a)

HCl

b)

NH3

c)

Cl-

d)

NH4+

8.

All cations (positively charged ions) are

a)

Lewis base

b)

Lewis acid

9.

All anions (negively charged ions) are

a)

Lewis acid

b)

Lewis base

10.

Acid base pair which differ by one proton (H+) is known as .....

a)

Inert pair

b)

Conjugate acid-base pair

c)

catalyst

11.

Conjugate acid of NH3 is ------

a)

HCl

b)

NH4+

c)

HNO3

d)

NaOH

12.

Conjugate base of HCl is .....

a)

NaOH

b)

KOH

c)

Cl-

d)

HNO3

13.

Conjugate base of H2CO3 is .....

a)

CO2

b)

HCO3-

c)

HCl

d)

NaOH

14.

Lewis acids are defined as

a)

H+ acceptors

b)

electron pair acceptors

c)

H+ donors

d)

electron pair donors

15.
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
16.

BF3 is an example of

a)

Lewis Acid

b)

Lewis Base

17.

NH3 is an example for

a)

Lewis Acid

b)

Lewis Base

18.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-14
d)
1-20
19.
Pure water has a pH of 7. Pure water _______.
a)
is a base
b)
is a neutral substance
c)
could be either an acid or a base
d)
is an acid
20.
If the pH of a solution is 9, it is a....
a)
acid
b)
base
c)
both
d)
none
21.
Which of the following is true about acids and bases?
a)
The lower the pH, the stronger the acid
b)
the higher the pH, the stronger the acid
c)
The lower the pH, the more neutral the acid
d)
The higher the pH, the weaker the base
22.

_______ is a substance with a pH greater than 7.

a)

Base

b)

Acid

c)

Buffer

d)

Water

23.

Acidic buffer is made up of

a)

weak acid and weak base

b)

strong acid and strong base

c)

weak acid and salt of strong base

24.

Mixture of acetic acid and sodium acetate is an example of ---------

a)

acidic buffer

b)

basic buffer

25.

An example for BASIC BUFFER is .......

a)

mixture of acetic acid and sodium acetate

b)

mixture of ammonium hydroxide and ammonium chloride

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