C1.3 Acid, Bases and Indicators

Question 1 of 23

1. Mention the pH scale values of weak acids in universal indicators?

0-7

5_7

0-4

None

Question 1 of 23

Question 2 of 23

2. What color is litmus paper in the base?

Red

Blue

Green

Purple

Question 2 of 23

Question 3 of 23

3. Mention the pH scale values of a neutral solution in universal indicators?

0-7

5_7

0-4

Question 3 of 23

Question 4 of 23

4. Mention the difference between acids and bases?

Acids have a sour taste but base has a bitter taste

Acids have a pH value below 7 but the base has a pH value above 7

Acids turn Litmus paper red but base turn Litmus paper blue

All of the above

Question 4 of 23

Question 5 of 23

5. A base is a substance which when reacted with acids forms salt and water as the only products?

False

maybe

TRUE

None

Question 5 of 23

Question 6 of 23

6. Very reactive metals like potassium, sodium, and Calcium react violently with acids?

False

True

Maybe

None

Question 6 of 23

Question 7 of 23

7. Mention the properties of acids

React with a base to form salt and water only

React with carbonates to form a salt, water, and carbon (IV) oxide.

React with metals to produce salt and hydrogen gas.

All of the above

Question 7 of 23

Question 8 of 23

8. Which indicator is mainly used to provide information about the strength of an acid or base?

pH scale

Litmus paper

Universal indicator

None

Question 8 of 23

Question 9 of 23

9. Materials that are used to classify various substances as either acids or bases are known as?

Indicators

Testers

pH scale

None

Question 9 of 23

Question 10 of 23

10. Mention the pH scale values of a strong base in universal indicators?

7_10

10_14

0-4

None

Question 10 of 23

Question 11 of 23

11. METAL + ACIDS = METAL SALT + HYDROGEN GAS

False

True

Maybe

None

Question 11 of 23

Question 12 of 23

12. Mention the pH scale values of a weak base in universal indicators

7_14

10_14

7_10

None

Question 12 of 23

Question 13 of 23

13. Mention the effects of acids on substance?

Acid rain cause corrosion damage to iron roofs and stone works

Acidic gases in the atmosphere are inhaled they cause respiratory diseases

Acidic soil is unsuitable for the growth of many plants

All of the above

Question 13 of 23

Question 14 of 23

14. What color is litmus paper in a neutral solution?

Red

Blue

Green

Purple

Question 14 of 23

Question 15 of 23

15. What color is litmus paper in acids?

Red

Blue

Green

Purple

Question 15 of 23

Question 16 of 23

16. Mention the properties of the base?

React with acids to form salt and water only

Have a bitter taste

Has a pH value above 7

All of the above

Question 16 of 23

Question 17 of 23

17. Mention the uses of acids?

Carbonic acids are used in aerated drinks to enhance the taste

Hydrochloric acid is used to clean metal surfaces

Nitric acid is used to manufacture of dye, paints, explosives, and fertilizers

All of the above

Question 17 of 23

Question 18 of 23

18. An acid is a compound that reacts with metals to form salt and hydrogen gas

TRUE

FALSE

Maybe

None

Question 18 of 23

Question 19 of 23

19. Mention the pH scale values of strong acids in universal indicators

0-7

5_7

0-4

None

Question 19 of 23

Question 20 of 23

20. What is the main disadvantage of Litmus indicator paper?

It is expensive

It is complicated

It discolors very easily

It doesn’t provide any information about the strength of an acid or base.

Question 20 of 23

Question 21 of 23

21. Mention the uses of the base?

Calcium oxide is used in the making cement and concrete

Sodium hydroxide is used to manufacture soap

Magnesium oxide is used to manufacture anti-acid tablets

All of the above

Question 21 of 23

Question 22 of 23

22. Which statement is CORRECT about a universal indicator

It is a mixture of several indicators and exhibits a range of colors in acids and in bases depending on the strength of the solution

It has an acid-base scale called pH scale

The pH scale has values that range from 0-14

All of the above

Question 22 of 23

Question 23 of 23

23. Acids react with carbonates and hydrogen carbonates to produce salt, water, and carbon (iv) oxide?

TRUE

False

Maybe

None

Question 23 of 23

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