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acids, bases and salts grade 7

Total questions: 100

Worksheet time: 1hrs 25mins

Name
Class
Date
1.

Choose the odd one out -

a)

China Rose (Hibiscus)

b)

Salt

c)

Methyl Orange

d)

None of the Above

2.

When the soil is too Basic, what do you add to neutralise the effect ?

a)

Basic Quicklime

b)

Phenolphthalein

c)

Organic Matter

d)

Nitric Acid

3.

When neutralization reaction happens, they form -

a)

Salt and Sodium Chloride

b)

Salt, Water and Heat

c)

Heat and Sugar

4.

Indicators are -

a)

Substances which are nor Acidic or Basic

b)

Substances that are used to test the Acidic or Basic nature of a substance

c)

Substances which have both chemical and physical properties

d)

None of the Above

5.

Which of the following Statements are true about Acids ?

a)

They are sour in taste and soapy to touch

b)

They are sour in taste

c)

Acids are present in Oranges, Ant sting, Vinegar etc.

d)

Acids are present in Vinegar, Sugar, Soap etc.

6.

When do you take an Antacid ?

a)

When you are Hungry

b)

When the soil is too Acidic

c)

When you have a Gastric problem in your stomach

d)

When the Factory wastes are disposed in waterbodies

e)

None of the Above

7.

A child got stung by a bee. Some of the Elders suggest to add Baking Soda or Lemon Juice. Which one do you think is Appropriate ?

a)

Lemon Juice

b)

Water

c)

Baking Soda

d)

None of the Above

8.

Before Factory wastes are disposed out to Waterbodies, why do they add basic substances ?

a)

So that the Factory wastes decomposes in Waterbodies

b)

Because they have Respect towards them

c)

So that they do not harm the Aquatic animals and Plants

d)

None of the Above

9.

When the pH Scale is on 5, the Nature of the substance is -

a)

Neutral

b)

Acidic

c)

Basic

d)

None of the Above

10.

When the pH Scale is on 7, the Nature of the substance is -

a)

Acidic

b)

Basic

c)

Soluble

d)

None of the Above

11.

Neutralization is a reaction between

a)

Two acids

b)

Two bases

c)

One Acid and one Base

d)

None of them

12.

Complete the Riddle:

Coffee is Brown

Bitter in taste.

Is it an Acid?

Or a -

(a)  

13.

What pH range would you get for an Acid ?

a)

0 - 6

b)

7

c)

7 - 14

d)

2 - 10

14.

What's another name for Antacid ?

(a)  

15.

BONUS QUESTION : Which of these Topics you like ?

a)

Acids, Bases and Salts

b)

Atoms

c)

HEY! I'M A CHEMISTRY LOVER

d)

No, i'm not interested in Chemistry

16.

Which of the following Statements are true about Acids ?

a)

They are sour in taste and soapy to touch

b)

They are sour in taste

c)

Acids are present in Oranges, Ant sting, Vinegar etc.

d)

Acids are present in Vinegar, Sugar, Soap etc.

17.

A child got stung by a bee. Some of the Elders suggest to add Baking Soda or Lemon Juice. Which one do you think is Appropriate ?

a)

Lemon Juice

b)

Water

c)

Baking Soda

d)

None of the Above

18.
Soap is an example of a ___ .
a)
acid
b)
base
19.

Which of the following is an acid?

a)

soap

b)

baking soda

c)

orange juice

d)

pure water

20.

What type of paper is used to test for acids and bases?

a)

Red paper

b)

Blue paper

c)

Lined paper

d)

Litmus paper

21.

When the soil is too Basic, what do you add to neutralise the effect ?

a)

Basic Quicklime

b)

Phenolphthalein

c)

Organic Matter

d)

Nitric Acid

22.

When do you take an Antacid ?

a)

When you are Hungry

b)

When the soil is too Acidic

c)

When you have a Gastric problem in your stomach

d)

When the Factory wastes are disposed in waterbodies

e)

None of the Above

23.

Before Factory wastes are disposed out to Waterbodies, why do they add basic substances ?

a)

So that the Factory wastes decomposes in Waterbodies

b)

Because they have Respect towards them

c)

So that they do not harm the Aquatic animals and Plants

d)

None of the Above

24.

When the pH Scale is on 5, the Nature of the substance is -

a)

Neutral

b)

Acidic

c)

Basic

d)

None of the Above

25.

What pH range would you get for an Acid ?

a)

0 - 6

b)

7

c)

7 - 14

d)

2 - 10

26.
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
27.

Acid in car battery:

a)

Hydrochloric acid

b)

Sulfuric acid

c)

Acetic acid

d)

Carbonic acid

28.

An indicator is?

a)

A lab manual or guide

b)

Something like litmus paper that can tell you if a substance is acidic or basic

c)

A PS4 game where you pretend to direct traffic

d)

Something only scientists in a lab can use

29.
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
30.
On the pH scale what numbers are bases?
a)
8-14
b)
0-7
c)
7
d)
1
31.
The pH scale measures...
a)
...the strength of an acid.
b)
...the strength of hydrogen ions.
c)
...the concentration of hydrogen ions.
d)
...the concentration of an acid
32.

Which of the following word pairs correctly completes the sentence below?

_______ are corrosive substances characterized as having a oily feel, a bitter 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

33.

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

a)

True

b)

False

34.

Four solutions are tested and found to have the following pH values. Which of these substances would be considered the weakest acid?

a)

Lemon Juice - pH=2

b)

Apple Juice - pH=4.5

c)

Shower Cleaner - pH=5.5

d)

Hydrogen Peroxide - pH=7

35.

What completely ionizes in solution?

a)

Weak acids

b)

Strong acids

c)

Strong Salts

d)

Neutral salts

36.

Which of the following is the best description of a salt?

a)

Forms when two metals react

b)

Forms when a carbonate reacts with sodium hydroxide

c)

Forms when all or part of the hydrogen ions in an acid is replaced

d)

Forms when two alkali reacts

37.

A lighted splint was held over a flask in which a gas was given off. The splint went out with a pop. Which gas was given off?

a)

hydrogen

b)

chlorine

c)

oxygen

d)

ammonia

38.
Electrolyte
a)
Acids
b)
Bases
c)
Salts
d)
All
39.
Which is most acidic?
a)
milk
b)
Lemon Juice
c)
bleach
40.
The pH of a dilute base
a)
7
b)
14
c)
8
d)
6
41.
Which of the following is NOT a strong acid?
a)
HCl
b)
HClO5
c)
H2SO4
d)
HNO3
42.
The pH scale measures ____ and ____
a)
acidity and basic 
b)
the temperature 
c)
how fun a chemistry quiz is
d)
none of the above 
43.
Why does vinegar help preserve things like pickles? 
a)
It keeps moisture in. 
b)
It preserves flavors and crispness
c)
It kills bacteria that break down foods. 
d)
It keeps the cells alive
44.
An extremely strong acid would have a pH of...
a)
1
b)
7
c)
9
d)
14
45.
An extremely strong base would have a pH of...
a)
1
b)
7
c)
9
d)
14
46.
A neutral substance would have pH of...
a)
8
b)
7
c)
6
d)
14
47.
If a solution is neither acidic or basic it has a pH of _____________.
a)
1
b)
13
c)
6
d)
7
48.
Indicators change color in the presence of a(n) _______________.
a)
acid or base
b)
buffer
c)
water molecule
d)
ester
49.
A base has a _________________.
a)
sour taste
b)
positive ion
c)
slippery feel
d)
pH of 5
50.
Tastes Sour
a)
Acids
b)
Bases
c)
Salts
d)
All
51.
 Which of the following is an acid?
a)
shampoo
b)
baking soda
c)
orange juice
d)
water
52.
Tastes bitter.
a)
Acids
b)
Bases
c)
Salts
d)
All
53.

Neutralization is a reaction between

a)

Two acids

b)

Two bases

c)

One acid and one base

d)

None of them

54.

Common salt is

a)

Acidic

b)

Neutral

c)

Basic

d)

all of them

55.

Sting of an ant contains

a)

Vinegar

b)

Common salts

c)

Milk of magnesia

d)

Formic acid

56.

From which plant litmus is extracted

a)

Lichens

b)

Roses

c)

neem

d)

China rose

57.

Taste of acid is

a)

Bitter

b)

Soupy

c)

Sour

d)

Sweet

58.

Milk of magnesia is used as an

a)

Chocolate

b)

Soup

c)

antacid

d)

None of them

59.

Lemon drop turns

a)

Red litmus into blue

b)

No reaction

c)

Blue Litmus into red

d)

All of them

60.

Which among of these is a natural indicator

a)

Mango leaf

b)

China rose

c)

Mint

d)

All of them

61.

Which is not the product of neutralization process

a)

Water

b)

Heat

c)

Salts

d)

Sugar

62.

How many type of Litmus is there

a)

One

b)

zero

c)

Five

d)

two

63.
Which of the following is a base?
a)
orange juice
b)
water
c)
vinegar
d)
dishwashing detergent
64.
If an acid is combined with a base of equal strength, the result will most likely be
a)
a neutral solution.
b)
a stronger acid.
c)
impossible to tell without testing the pH.
d)
a stronger base
65.
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
66.
Which type of ion does a base produce when it is dissolved in water?
a)
oxide
b)
oxygen
c)
hydrogen
d)
hydroxide
67.

What is the meaning of the above hazard warning symbol?

a)

Corrosive

b)

Explosive

c)

Toxic

d)

Radioactive

68.

The pH of pure water

a)

5.6

b)

7.0

c)

8.1

d)

0.0

69.

Acid in our stomach:

a)

Hydrochloric acid

b)

Sulfuric acid

c)

Acetic acid

d)

Carbonic acid

70.
Tastes bitter.
a)
Acids
b)
Bases
c)
Salts
d)
All
71.
This image represents
a)
Neutralization reaction
b)
synthesis
c)
decompostion
d)
single displacement
72.

Salts of Sulphurous acid (H2SO3) is named as-

a)

Sulphates

b)

Sulphites

c)

Sulphide

d)

None

73.

Which of the following is weak acid?

a)

Carbonic acid

b)

Nitric acid

c)

Sulphuric acid

d)

Hydrochloric acid

74.

Guava contains __________ acid.

a)

Citric acid

b)

Carbonic acid

c)

Lactic acid

d)

Oxalic acid

75.

An indicator that turns pink in basic medium is ________.

a)

Phenolphthalein

b)

Turmeric Powder

c)

Red litmus paper

d)

Blue Litmus Paper

76.

Salts formed by the reaction of strong acid and strong base are ________ salts.

a)

Acidic salts

b)

Basic salts

c)

Neutral salts

d)

None

77.

The color of red litmus paper in basic salt solution is -

a)

Remains Red

b)

Changes to blue

c)

No color change

d)

Changes to violet

78.

Na3PO4 is __________ salt.

a)

Acidic

b)

Basic

c)

Neutral

d)

None

79.

Naturally occurring acids that are found in plants and animals are called ________.

a)

Organic acids

b)

Mineral acids

c)

Both

d)

None

80.

The _______ show different colours in an acidic and in basic medium.

a)

Indicator

b)

Lemon juice

c)

Acetic acid

d)

None

81.

Acidic salts are made up of ______ acid and ______ base, respectively.

a)

Strong, weak

b)

Strong, strong

c)

Weak, strong

d)

Weak, weak

82.

Sodium acetate is a _____ salt.

a)

Acidic

b)

Basic

c)

Neutral

d)

None of these

83.

An indicator that turn green in basic medium is _______.

a)

Phenolphthalein

b)

China rose

c)

Litmus paper

d)

Turmeric power

84.

Identify weak acid-

a)

Acetic acid

b)

Nitric acid

c)

Sulphuric acid

d)

Hydrochloric acid

85.

Identify the products, when nitric acid reacts with potassium hydroxide-

a)

Potassium nitrate & water

b)

Potassium hydroxide and water

c)

Potassium sulphate and water

d)

None

86.

Identify the products, when Ammonium hydroxide reacts with Sulphuric acid.

a)

Ammonium sulphate and water

b)

Ammonium nitrate and Sulpuric acid

c)

Ammonium sulphate and ammonium sulphate

d)

Water

87.

Identify basic salt.

a)

Sodium chloride

b)

Ammonium chloride

c)

Sodium acetate

d)

Copper acetate

88.

An aqueous solution of NaCl can turn red litmus into-

a)

Blue

b)

Color remains same that is red

c)

Changed to purple

d)

None

89.

NaOH and KOH are also known as-

a)

Strong bases

b)

Alkalis

c)

Both

d)

None

90.

CH3 COOH is

a)

Organic acid

b)

Mineral acid

c)

Both A and B

d)

None of These

91.

Chemical formula of Salt (in full form)

(a)  

92.

In which of the following Oxalic acid is not present ?

a)

Spinach

b)

Tomatoes

c)

Guava

d)

Apples

93.

True or False. Nitric acid is organic acid.

a)

True

b)

False

94.

Strong acid + Weak base makes

a)

Acidic salt

b)

Basic salt

c)

Neutral salt

95.

NaOH and KOH is

a)

Basic

b)

Alkalise

c)

Not soluble

d)

Acidic

96.

True or False. Antacid is containing Mg(OH)2.

a)

True

b)

False

97.

HCl + NaOH forms

a)

Sodium Acetate

b)

Sodium Chloride

98.

Phenolphthalein ( C20 H14 O4 ) turns ________in basic solution.

a)

Green

b)

Red

c)

Pink

d)

Blue

99.

NH4OH is (a)   .

100.

Litmus paper is made from (a)   .

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