Acids, Bases and Salts Class 10 Important Questions - Free PDF
Acids, Bases and Salts Class 10 Important Questions: Out of all the subjects in the CBSE Class 10 board exam, Math and Science are usually seen as the toughest. That’s because they don’t just test how much you’ve memorised, they focus more on how well you understand the concepts, and how quickly and accurately you can apply them.
In Science, topics are divided into three parts: Physics (which covers motion, force, light, and energy), Chemistry (about substances and how they react), and Biology (focused on living organisms). In Chemistry, one of the first and most important chapters you’ll come across is Acids, Bases and Salts.
To make your revision easier, PW has put together a complete set of notes and questions from this chapter, all in one place. These acids, bases and salts Class 10 important questions include everything from basic definitions and reactions to reasoning and real-life application-based problems.
So, if you're looking for reliable and exam-focused Class 10 Acids, Bases and Salts C questions, you’re in the right place. Just scroll down to find all the Acids, Bases and Salts Class 10 Important Questions you need to study smarter and score better.
Check Out: CBSE Class 10 Books
Overview of Acids, Bases and Salts Class 10 Chapter
Here is an overview of Acids, Bases and Salts Class 10 Chapter:
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Acids are substances that release hydrogen ions (H⁺) when dissolved in water, and they usually have a sour taste. This is a foundational concept in the acids, bases and salts Class 10 chapter and is often asked in various forms in exams.
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Bases are substances that produce hydroxide ions (OH⁻) in aqueous solution, and they usually taste bitter and feel soapy to the touch.
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Acids and bases are classified as strong or weak depending on their degree of ionisation in water. For example, hydrochloric acid (HCl) is a strong acid, while acetic acid (CH₃COOH) is weak.
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Indicators like litmus, phenolphthalein, and methyl orange are used to test whether a solution is acidic or basic. Litmus turns red in acid and blue in base, which is a frequent question in both MCQs and short-answer formats.
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The pH scale is used to measure the strength of an acid or base, ranging from 0 to 14. A pH of 7 is neutral, below 7 is acidic, and above 7 is basic. Understanding pH and its real-life applications is often highlighted in the acids, bases and salts Class 10 important questions.
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A neutralisation reaction occurs when an acid reacts with a base to form a salt and water. For example, HCl + NaOH → NaCl + H₂O.
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Acids react with metals to produce salt and hydrogen gas, and this reaction is tested often with experiments such as zinc reacting with hydrochloric acid.
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Acids also react with metal carbonates and metal hydrogen carbonates to form salt, water, and carbon dioxide gas. This reaction is not only conceptually important but also appears regularly in acids, bases and salts Class 10 important questions in board exams.
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Bases react with non-metallic oxides to form salt and water, showing that non-metallic oxides are acidic in nature.
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Salts like washing soda (Na₂CO₃·10H₂O), baking soda (NaHCO₃), and bleaching powder (CaOCl₂) are widely used in households and industry.
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Water of crystallisation is the fixed number of water molecules present in a salt. For example, copper sulphate pentahydrate (CuSO₄·5H₂O) turns white on heating.
Check Out: CBSE Class 10 Revision Books
Acids, Bases and Salts Class 10 Important Questions
Science in Class 10 can feel a bit overwhelming, especially when chapters like Acids, Bases and Salts start introducing new terms, reactions, and equations. It’s one of the most important Chemistry chapters and often carries good weight in the CBSE board exams.
To make things simpler for students, PW has compiled all the important questions from the chapter in one place, including definitions, reaction-based problems, reasoning questions, and real-life application cases. Whether you're revising last minute or preparing for a test, the link provided below will guide you through the acids, bases and salts Class 10 important questions you need to practise.
Here we have provided CBSE Important Questions for Class 10 Science Chapter 2 Acids, Bases and Salts-
Matching Answer Type Questions
Note: Match the items of Column A and Column B in the following questions.
Q1. Match the acids given in Column (A) with their correct source given in Column (B)
| Column A | Column B |
|---|---|
| Lactic acid | Tomato |
| Acetic acid | Lemon |
| Citric acid | Vinegar |
| Oxalic acid | Curd |
Answer:
| Column A | Column B |
|---|---|
| Lactic acid | Curd |
| Acetic acid | Vinegar |
| Citric acid | Lemon |
| Oxalic acid | Tomato |
Q2. Match the important chemicals given in Column (A) with the chemical formulae given in Column (B).
| Column A | Column B |
|---|---|
| Plaster of Paris | Ca(OH) 2 |
| Gypsum | CaSO 4 . ½ H 2 O |
| Bleaching Powder | CaSO 4 . 2 H 2 O |
| Slaked Lime | CaOCl 2 |
Answer:
| Column A | Column B |
|---|---|
| Plaster of Paris | CaSO 4 . ½ H 2 O |
| Gypsum | CaSO 4 . 2 H 2 O |
| Bleaching Powder | CaOCl 2 |
| Slaked Lime | Ca(OH) 2 |
Check Out: CBSE Class 10th Sample Papers
Short Answer Type Questions
Q1. What will be the action of the following substances on litmus paper?
- Dry HCI gas
- Moistened NH 3 gas
- Lemon juice
- Carbonated soft drinks
- Curd
- Soap solution
Answer:
Dry HCl Gas: Effect on Litmus: No effect (does not change color). Moistened NH3 Gas: Effect on Litmus: Turns red litmus blue (alkaline in nature). Lemon Juice: Effect on Litmus: Turns blue litmus red (acidic in nature). Carbonated Soft Drinks: Effect on Litmus: Turns blue litmus red (contains carbonic acid). Curd: Effect on Litmus: Turns blue litmus red (contains lactic acid). Soap Solution: Effect on Litmus: Turns red litmus blue (alkaline in nature).
Q2. Name the acid present in ant sting and give its chemical formula. Also, give the common method to get relief from the discomfort caused by the ant sting.
Answer:
The acid present in an ant sting is formic acid , also known as methanoic acid . Its chemical formula is HCOOH .
Relief from Discomfort Caused by Ant Sting
To relieve the discomfort caused by an ant sting, you can use the following methods:
Baking Soda (Sodium Bicarbonate): Apply a paste made from baking soda and water to the affected area. Baking soda is basic and helps neutralize the acidic effect of formic acid, providing relief from pain and irritation.
Calamine Solution: Apply calamine lotion, which contains zinc carbonate. It helps soothe the skin and neutralizes the acid effect of the sting.
Q3. What happens when nitric acid is added to the eggshells?
Answer:
Eggshells contain calcium carbonate. Calcium carbonate reacts with nitric acid to form calcium nitrate and carbon dioxide gas. CaCO 3 (s) + HNO 3 (aq) → CaNO 3 (aq) + CO 2 (g) + H 2 O (l)
Q4. A student prepared solutions of (i) an acid and (ii) a base in two separate beakers. She forgot to label the solutions, and litmus paper was not available in the laboratory. Since both the solutions are colourless, how will she distinguish between the two?
Answer:
To distinguish between two colorless solutions one an acid and the other a base without using litmus paper, the student can employ indicators such as phenolphthalein, turmeric, or China rose. By adding a few drops of phenolphthalein to each solution, the student can observe that the solution turning pink indicates the presence of a base while the solution remaining colorless signifies an acid. Alternatively, using turmeric paper will show that the paper turns red in the presence of a base, whereas it remains unchanged in an acidic solution. Similarly, a China rose solution can be used; the solution that turns dark pink (magenta) indicates acidity, while the one that turns green indicates a basic nature. These simple methods enable the student to identify the solutions accurately.
Q5. How would you distinguish between baking powder and washing soda by heating?
Answer:
Baking soda (NaHCO 3 ) liberates carbon dioxide gas on heating, confirmed by passing it in lime water. Whereas on heating washing soda Na 2 CO 3 .10H 2 O water of crystallisation is given out, the salt becomes anhydrous.
Reaction:
2 NaHCO 3 → Na 2 CO 3 + H 2 O + CO 2 Na 2 CO 3 .10H 2 O → Na 2 CO 3 + 10 H 2 O
Check the acids, bases and salts class 10 PDF.
Acids, Bases and Salts Class 10 Important Questions
CBSE Class 10 Mind Map
Apart from extra questions and regular notes, students can also use mind maps to make their learning easier. PW CBSE Class 10 Mind Maps Books are here to help you understand and revise topics quickly. It has well-designed maps that show the full chapter on one page.
For example, if you’re studying Maths, you can use the Mind Map for Class 10 CBSE Maths to revise formulas and steps. Similarly, if you’re preparing for English, check the Mind Map for Class 10 CBSE English to help you with the chapters, themes, and grammar in one go.
How to Prepare for CBSE Class 10 Science?
1. Start with the NCERT Textbook
Before anything else, your focus should be on finishing the NCERT Science textbook. Most of the CBSE board questions come directly or indirectly from it. For chapters like Acids, Bases and Salts Class 10, the explanations, activities, and solved examples in NCERT are more than enough to understand the core concepts.
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Read each chapter line-by-line without skipping any part, especially the blue boxes and in-text questions.
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Underline or highlight definitions and important reactions.
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For acids bases and salts class 10, make sure you pay attention to the activities and the reasoning behind pH changes.
2. Understand Before You Memorise
Many students make the mistake of jumping into question banks and sample papers before actually understanding the chapter. Chapters like Acids, Bases and Salts need a clear conceptual understanding, especially when dealing with chemical reactions, indicators, pH values, and real-life examples.
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Watch visual explanations or classroom videos to understand how neutralisation works.
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Use simple analogies (e.g., acid as lemon juice, base as soap) to remember examples.
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Try explaining what you’ve learned to someone else. If you can teach it, you know it.
3. Make Your Own Notes
Making your own notes is the smartest thing you can do while studying Science. It helps you remember information and also makes last-minute revision easier. For chapters like acids bases and salts class 10, where there are several reactions, definitions, and properties, notes are a must.
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All important definitions and chemical equations.
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Flowcharts showing types of acids and bases.
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Real-life uses of salts like baking soda, washing soda, and bleaching powder.
4. Use Sticky Notes and Formula Cards
Sticky notes are underrated when it comes to revision. For Chemistry, especially the acids bases and salts class 10 chapter, using sticky notes to jot down key formulas or reactions and sticking them near your study space can really help with remembering and learning.
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Write down the pH range of common substances and stick them on your wall.
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List 3–5 must-remember reactions from the chapter and glance at them daily.
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Label your notebook pages with “Important” or “To revise again” flags.
Check Out: CBSE Class 10 Question Banks
5. Practice Questions After You Fully Understand the Chapter
Attempting questions blindly won’t help if you haven’t understood the theory. Once you’re confident with the chapter, start solving acids bases and salts class 10 questions from sample papers, NCERT back exercises, and other question banks.
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NCERT back questions and exemplar problems.
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Previous year board papers.
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Class 10 acids bases, and salts C questions shared by trusted sources like PW.
6. Use PDFs and Digital Resources Wisely
It’s easy to rely only on digital material, but your textbook should always be your first go-to. That said, using high-quality downloadable materials like acids bases and salts class 10 pdf can be helpful during quick revisions.
7. Revise Frequently: Not Just Before the Exam
Waiting until the last moment to revise is one of the biggest mistakes. For Science, and especially for memory-heavy chapters like acids bases and salts class 10, regular revision is the key to long-term retention.
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Revise the same chapter after 24 hours, then again after a week.
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Solve a few questions daily instead of doing 50 in one day.
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Use colour-coded pens to mark what you’ve already revised.
8. Practise Writing Answers
Knowing the answer isn’t enough; you should know how to write it properly. Practising acids bases, and salts class 10 important questions will help you understand how to frame your answers the way CBSE expects.
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Always write chemical equations in a clean and balanced form.
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Use headings, bullet points, and underline key terms.
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Keep your answers short, neat, and direct to the point.
Read More: NCERT Solutions for Class 10 Acids, Bases, and Salts
Acids, Bases, and Salts FAQs
1. What are the most important topics in the Acids, Bases and Salts chapter for Class 10?
Some of the most important topics include the properties of acids and bases, the pH scale, neutralisation reactions, uses of common salts, and chemical reactions involving acids, bases, and salts.
2. Are NCERT questions enough for Acids, Bases and Salts Class 10?
Yes, NCERT is the primary source. Most CBSE exam questions are either directly from the textbook or based on its concepts.
3. Where can I get a PDF of all the important questions for this chapter?
You can download an acids bases and salts class 10 PDF from reliable educational platforms like PW.
