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3rd Topic 3 Using Indicators

Total questions: 27

Worksheet time: 13mins

Name
Class
Date
1.

What is the colour of methyl orange an acid ?

a)

Red

b)

Yellow

c)

Orange

d)

Colourless

2.

What is the colour of phenolphthalein an acid?

a)

Pink

b)

Yellow

c)

Orange

d)

Colourless

3.

What is the colour of litmus in an acid ?

a)

Pink

b)

Yellow

c)

Red

d)

Colourless

4.

What is the colour of litmus in a base ?

a)

Pink

b)

Blue

c)

Red

d)

Colourless

5.

What is the colour of phenolphthalein in a base ?

a)

Pink

b)

Blue

c)

Red

d)

Colourless

6.

What is the colour of methyl orange in a base ?

a)

Pink

b)

Blue

c)

Yellow

d)

Colourless

7.

What happens to litmus paper in acidic solutions?

a)

Red litmus turns blue

b)

Blue litmus turns red

c)

Yellow litmus turns green

8.

Universal indicator solution is usually green to begin with. What does this mean?

a)

It is acidic

b)

It is alkaline

c)

It is neutral

9.

A liquid has a pH of 8. What does this mean?

a)

it is neutral

b)

It is weakly acidic

c)

it is weakly akline

10.

A liquid has a pH of 1. What does this mean?

a)

It must be sodium hydroxide solution

b)

It is strongly acidic

c)

It is weakly akline

11.

Our stomach contain ____________ to help us digest food

a)

strong alkaline

b)

salspecial salt and water

c)

strong acid

12.

pH of soap is 8, soap is ________

a)

strongly acidic

b)

neutral

c)

weakly alkaline

13.

Which pH could belong to a strong alkali?

a)

14

b)

8

c)

5

d)

1

14.

Which pH could belong to a weak acid?

a)

14

b)

8

c)

5

d)

1

15.

Which pH could belong to a weak alkali?

a)

14

b)

8

c)

5

d)

1

16.
The pH scale measures
a)
the acidity of a chemical
b)
the reactivity of a chemical
c)
the boiling point of a chemical
d)
the electrical conductivity of a chemical
17.
The pH measures between 
a)
0 and 10
b)
0 and 7
c)
7 and 14
d)
0 and 14
18.
The pH of all acids will be between:
a)
0 - 14
b)
0 - 7
c)
5 - 10
d)
7 - 14
19.
The pH of all alkalis (soluble bases) will be between:
a)
0 - 14
b)
0 - 7
c)
5 - 10
d)
7 - 14
20.
The pH of a strong acid would be:
a)
1-2
b)
5-6
c)
8-9
d)
12-13
21.
The pH of a strong base would be:
a)
1-2
b)
5-6
c)
8-9
d)
12-13
22.
The pH of a weak base would be:
a)
1-2
b)
5-6
c)
8-9
d)
12-13
23.
The pH of a weak acid would be:
a)
1-2
b)
5-6
c)
8-9
d)
12-13
24.
Hydrochloric acid is a strong acid. A 50cm3 sample would have a pH of (approximately)
a)
1-2
b)
3-4
c)
5-6
d)
7
25.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
26.
A(n) _______ is a substance with a pH greater than 7.
a)
Base
b)
Acid
c)
Buffer
d)
Water
27.
What is the only substance with a neutral pH of 7?
a)
Milk
b)
Orange Juice
c)
Water
d)
Blood

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