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CBSE - Class 10 Science Acids, Bases and Salts Worksheet

EXERCISES

1.
Five solutions $A, B, C, D$ and $E$ when tested with universal indicator showed pH as 4,1,11,7 and 9, respectively. Which solution is (a) neutral?
2.
Five solutions $A, B, C, D$ and $E$ when tested with universal indicator showed pH as 4,1,11,7 and 9, respectively. Which solution is (e) weakly alkaline?
3.
Five solutions $A, B, C, D$ and $E$ when tested with universal indicator showed pH as 4,1,11,7 and 9, respectively. Which solution is (d) weakly acidic?
4.
A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains
a. (a) NaCl b. (b) HCl c. (c) LiCl d. (d) KCl
5.
Plaster of Paris should be stored in a moisture-proof container. Explain why?
6.

A solution turns red litmus blue, its pH is likely to be

a.

1

 b.

4

 c.

5

 d.

(d) 10
7.
A milkman adds a very small amount of baking soda to fresh milk. (b) Why does this milk take a long time to set as curd?
8.
Write word equations and then balanced equations for the reaction taking place when – (b) dilute hydrochloric acid reacts with magnesium ribbon.
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?
10.
Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer.
11.
Why does distilled water not conduct electricity, whereas rain water does?
12.
Write word equations and then balanced equations for the reaction taking place when – (a) dilute sulphuric acid reacts with zinc granules.
13.
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. (a) 4 mL b. (b) 8 mL c. (c) 12 mL d. (d) 16 mL
14.
Compounds such as alcohols and glucose also contain hydrogen but are not categorised as acids. Describe an Activity to prove it.
15.
Give two important uses of washing soda and baking soda.
16.
Which one of the following types of medicines is used for treating indigestion?
a. (a) Antibiotic b. (b) Analgesic c. (c) Antacid d. (d) Antiseptic
17.
Write word equations and then balanced equations for the reaction taking place when – (d) dilute hydrochloric acid reacts with iron filings.
18.
What is a neutralisation reaction? Give two examples.
19.

A solution has a pH of 3, while another solution has a pH of 5. Compared with the second solution, the hydrogen ion concentration of the first solution is:

a.

2 times greater

 b.

10 times greater

 c.

100 times greater

 d.

1000 times greater
20.
Write word equations and then balanced equations for the reaction taking place when – (c) dilute sulphuric acid reacts with aluminium powder.

Worksheet Answers

4.
6.
13.
16.
19.
Option C

Solution:

A decrease of 1 pH unit means a 10-fold increase in H⁺ concentration. The difference is 2 pH units:

10² = 100

Therefore, the pH 3 solution has 100 times more H⁺ ions.

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