Task-1

Task-1 Exercises Acid, Base and Salt

1. State differences between acids and bases.

2. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?

3. Name the source from which litmus solution is obtained. What is the use of this solution?
4. Is the distilled water acidic/basic/neutral? How would you verify it?

5. Describe the process of neutralization with the help of an example.
For Example :

6. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(i) Nitric acid turn red litmus blue. (T/F)
(ii) Sodium hydroxide turns blue litmus red. (T/F)
(iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F)
(iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)
(v) Tooth decay is caused by the presence of a base. (T/F)


7. Nuha has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Nuha decide which drink is to be served to whom?

8. Explain why:
(a) An antacid tablet is taken when you suffer from acidity.
(b) Calamine solution is applied on the skin when an ant bites.
(c) Factory waste is neutralised before disposing it into the water bodies.
9. Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator.
10. Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
11. Consider the following statements:
(a) Both acids and bases change colour of all indicators.
(b) If an indicator gives a colour change with an acid, it does not give a change with a base.
(c) If an indicator changes colour with a base, it does not change colour with an acid.
(d) Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
(i) All four (ii) a and d (iii) b and c (iv) only d

Problem Sheet Remidial Daily Test-1

Problem Sheet Remidial Daily test-1
True/false exercise
Acids, bases, pH, pOH, pKa, dissociation of water, neutralization
The following are a series of true false questions that are a preview of the chapter content.
1.T/F Ammonia dissolved in water, NH3(aq), is a common household base.
2. T/F Acid solutions have a high pH.
3. T/F Oxides of metals like CaO form basic solutions when dissolved in water.
4. T/F Pure water is neutral because it contains no hydronium or hydroxide ions.
5. T/F An example of a strong acid is hydrochloric acid.
6. T/F Neutral solutions have equal numbers of H1+ ions and OH1- ions.
7. T/F The pH scale has a range from 1 to 14.
8. T/F Acids are sources of H1+ or hydronium ions.
9. T/F Binary acids are aqueous solutions of compounds like HCl, H2S, HBr.
10. T/F A polyprotic acid like sulfuric acid H2SO4 releases both H1+ ions at the same time.
11. T/F Nonmetal oxides like SO2 and CO2 combine with rain water to form acid precipitation.
12. T/F A pH of "7" is neutral for water solutions at 25 o C.
13. T/F Weak acids do not react with bases.
14. T/F Traditional acids like HCl(aq) react with traditional bases like NaOH(aq) to form water and a salt.
15. T/F The use of the term (aq) means a substance is dissolved in water.
16. T/F Acids are not found in nature.
17. T/F Seawater is neutral with a pH of "7".
18. T/F Human blood is acidic with a pH below "7".
19. T/F All acids that contain oxygen have a weak bond between hydrogen and oxygen.
20. T/F Hydroxide ions, OH1-, are released in water solutions of traditional bases.