Self assessment
Question 1 of 7
Which of the following statements is true?
A
All bases dissolve in water.
B
Alkalis are bases that dissolve in water.
C
Alkalis have a pH of less than 7.
D
Some alkalis are not bases.
Universal Indicator, red cabbage indicator or pH paper can determine whether a solution is:
A
Alkaline only.
B
Acidic, alkaline or neutral.
C
A salt.
D
Acidic only.
What might be a good reason to choose litmus paper for testing acids and alkalis?
A
Litmus is the original indicator so we'll stick with it.
B
Litmus is more accurate than other indicators.
C
Litmus is less complex than indicators such as Universal Indicator and the simple result of either acid or alkali is easily seen.
D
Litmus is quicker to use than other indicators.
Which of the following items have a pH of greater than 7?
A
Toothpaste.
B
Oven cleaner.
C
Table salt.
D
Tomato sauce.
Which of the following substances has a pH of less than 7?
A
Baking soda.
B
Fizzy drink.
C
Indigestion remedy.
D
Orange juice.
Which of the following oxides dissolves in water to give a solution of pH greater than 7?
A
Carbon dioxide.
B
Magnesium oxide.
C
Sulfur dioxide.
D
Nitrogen dioxide.
Which of the following oxides, produced by the combustions of fuels, dissolve in rainwater to make acid rain?
A
Nitrogen dioxide.
B
Calcium oxide.
C
Copper oxide.
D
Sulfur dioxide.