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ACID BASES AND SALT

Total questions: 50

Worksheet time: 38mins

Name
Class
Date
1.

metal oxides are generally

a)

acidic in nature

b)

basic in nature

c)

neutral

d)

some may be acidic some may be basic

2.

HCl is aciidic in

a)

in gaseous state

b)

in benzene solution

c)

in aqueous solution

d)

in any of these

3.

Litmus solution is purple colured dye extracted from (a)   plant

4.

phenophthalein has __________ colur in basic solution.

a)

red

b)

pink

c)

yellow

d)

green

5.
If you have a solution that is very acidic with a pH of 3.5, what can you do to raise the pH? 
a)
add more acid
b)
add more water
c)
increase the temperature
d)
add a base
6.
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
7.
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
8.
Which type of ion does a base produce when it is dissolved in water?
a)
oxide
b)
oxygen
c)
hydrogen
d)
hydroxide
9.
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
10.
On the pH scale what numbers are bases?
a)
8-14
b)
0-7
c)
7
d)
1
11.

Which type of ion does an acid produce when it is dissolved in water?

a)

oxide

b)

oxygen

c)

hydronium

d)

hydroxide

12.

What is the pH of a solution that results from the complete neutralization of an HCl solution with a KOH solution?

a)

1

b)

7

c)

10

d)

4

13.
Which of the following is a salt: ammonia or sodium chloride?
a)
ammonia 
b)
sodium chloride
14.
Ranging from 0 to 14, a pH value indicates how acidic or basic a solution is.  Which of these pH values would be a strong acid?
a)
2
b)
6
c)
9
d)
13
15.
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
16.

What pH range would you get for an acid?

a)

0-6

b)

7

c)

7-14

d)

2-10

17.

Alkalis feel...

a)

Rough

b)

Granulated

c)

Soapy

d)

Smooth

18.
Salt water did not react with the Red or Blue litmus paper.  This must mean
a)
Salt water is a Base
b)
Salt water is an Acid
c)
Salt water is neutral
d)
Salt water is charged
19.

Identify the acid present in tamarind.

a)

Tannic acid

b)

Lactic acid

c)

Tartaric acid

d)

Citric acid

20.

Which is NOT an indication of a chemical change?

a)

temperature change

b)

formation of a precipitate

c)

shape change

d)

production of light

21.
 Which of the following is an acid?
a)
shampoo
b)
baking soda
c)
orange juice
d)
water
22.

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

a)

Neutralization

b)

Combustion

c)

Oxdation

d)

Decomposition

23.
Tastes Sour
a)
Acids
b)
Bases
c)
Salts
d)
All
24.
is this object acidic or base
a)
Acidic
b)
Base
c)
neither
d)
neutral 
25.

Which of the following are the characteristics of a BASE?

a)

Very bitter in taste

b)

Liberate OH- ions when dissolved in water

c)

Have pH of less than 7

d)

Turns blue litmus red

26.

Which among the following is not a base?

a)

NaOH

b)

KOH

c)

HCl

d)

NH4OH

27.

Which of these turn red litmus paper blue?

a)

acids

b)

bases

c)

salts

28.

The pH scale is used to determine the strength of

a)

acids and bases

b)

chemical bonds

c)

electrical charges

d)

particles in a solution

29.

How would you best describe your science class this year?

a)

awesome

b)

very strange

c)

dull

30.
Plaster of Paris is made from
a)
Lime stone
b)
Slaked Lime
c)
Quick lime
d)
Gypsum
31.
Setting of Plaster of Paris takes place due to
a)
Oxidation
b)
Reduction
c)
Dehydration
d)
Hydration
32.
Washing soda has the formula
a)
Na2CO3.7H2O
b)
Na2CO3.10H2O
c)
Na2CO3.H2)
d)
Na2CO3
33.
BASE + ACID ----> SALT +?
a)
water
b)
oxygen
c)
hydrogen ion
d)
hydroxide ion
34.

Which of the following base is used in the manufacture of bleaching powder?

a)

Sodium hydroxide

b)

Calcium hydroxide

c)

Potassium hydroxide

d)

Magnesium hydroxide

35.

A colourless and odourless gas is liberated when hydrochloric acid is added to a solution of washing soda. The name of the gas is

a)

Carbon dioxide

b)

Nitrogen dioxide

c)

Sulphur dioxide

d)

Sulphur trioxide

36.

The compounds obtained on heating baking soda are

a)

Sulphur dioxide and sodium carbonate

b)

Sodium bicarbonate, water and carbon dioxide

c)

Sodium carbonate, water and carbon dioxide

d)

Hydrochloric acid and water

37.

Which indicator is colourless in acid and pink in alkali?

a)

Litmus

b)

Phenolphthalein

c)

Universal Indicator

d)

Methyl Orange

38.

Complete this equation:

sulfuric acid + potassium hydroxide -->

a)

potassium oxide + hydrogen

b)

potassium chloride + water

c)

potassium sulfate + hydrogen

d)

potassium sulfate + water

39.

Which equation is balanced?

a)

H2SO4 + NaOH --> Na2SO4 + H2

b)

H2SO4 + 2NaOH --> Na2SO4 + H2

c)

H2SO4 + 2NaOH --> Na2SO4 + H2O

d)

H2SO4 + 2NaOH --> Na2SO4 + 2H2O

40.

Acids are substances that release H+ ions when dissolved in water.

a)

True

b)

False

41.
calcium phosphate is present in tooth enamel its nature is
a)
basic
b)
acidic 
c)
neutral
d)
amphoteric
42.
common salt besides being used in kitchen can also be used as the raw material for making
a)
washing soda
b)
calcium salts
c)
plaster of paris
d)
slaked lime
43.
To protect tooth decay we are advised to brush our teeth regurlarly.The toothpaste is
a)
acidic
b)
neutral
c)
basic
d)
corrosive
44.
which of the foll phenomena occur when a small amunt of acid is added to water
a)
ionisation
b)
neutralisation
c)
dilution
d)
formation
45.

Do acids and bases conduct electricity?

a)

Only acids conduct electricity

b)

Only bases conduct electricity

c)

Bases and acids conduct electricity

d)

Neither conduct electricity

46.

What are the products if magnesium reacts with hydrochloric acid?

a)

Magnesium chloride + Hydrogen

b)

Magnesium sulfate + Hydrogen

c)

Magnesium oxide + Hydrogen

d)

Magnesium sulfide + Hydrogen

47.

Complete the following word equation:

Metalcarbonate + acid -->

a)

Salt + Hydrogen

b)

Salt + Water + Carbon Dioxide

c)

Salt + Water

48.

Which of the following can be used as an antacid?

a)

Na2CO3

b)

NaHCO3

c)

NaCl

d)

NaOH

49.

Which of these is used in the glass industry?

a)

Sodium Chloride

b)

Sodium Hydroxide

c)

Sodium Carbonate

d)

Sodium bicarbonate

50.

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

a)

2

b)

1

c)

1.5

d)

0.5

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