Worksheet (Ch 2: Acids, Bases and Salts)

This worksheet contains practice questions for Class 10 Science; Chapter 2: Acids, Bases and Salts. These questions are based on CBSE board curriculum as per NCERT textbook.

By practicing these questions, you will be able to get an idea of what type of questions may appear in the examination.

Question 1:
A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains
(a) NaCl
(b) HCl
(c) LiCl
(d) KCl

Question 2:
A solution turns red litmus blue, its pH is likely to be
(a) 1
(b) 4
(c) 5
(d) 10

Question 3:
10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount HCl solution (the same solution as before) required to neutralise it will be
(a) 4 mL
(b) 8 mL
(c) 12 mL
(d) 16 mL

Question 4:
Name the substance which on treatment with chlorine yields bleaching powder.

Question 5:
Do basic solutions also have H⁺(aq) ions? If yes, then why are these basic?

Question 6:
3 mL of water and 10 mL of sulphuric acid are to be mixed in a beaker
(i) State the method that should be followed with reason.
(ii) What is this process called?

Question 7:
Why does distilled water not conduct electricity, whereas rain water does?

Question 8:
Why do HCl, HNO₃, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?

Question 9:
A milkman adds a very small amount of baking soda to fresh milk.
(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
(b) Why does this milk take a long time to set as curd?

Question 10:
Why does dry HCl gas not change the colour of the dry litmus paper?

Question 11:
Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH₃COOH) is added to test tube B. Amount and concentration taken for both the acids are same. In which test tube will the fizzing occur more vigorously and why?

Question 12:
Plaster of Paris should be stored in a moisture-proof container. Explain why?

Question 13:
Why should curd and sour substances not be kept in brass and copper vessels?

Question 14:
Give two important uses of washing soda and baking soda.

Question 15:
What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved.

Question 16:
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?

Question 17:
(i) How is the concentration of hydronium ions (H₃O⁺) affected when a solution of an acid is diluted?
(ii) How is the concentration of hydroxide ions (OH^–) affected when excess base is dissolved in a solution of sodium hydroxide?

Question 18:
You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?

Question 19:
Write an equation to show the reaction between Plaster of Paris and water.