SSC Worksheet for chapter-3 Acids, Bases and Salts class 10

Worksheet For class 10

This page is prepared by the Academic team of Physics Wallah which consists of SSC Board Worksheet for Class 10 Chemistry. Students of Class 10 Chemistry can get a free Worksheet for Class 10 Chemistry in PDF format prepared as per the newest syllabus and examination pattern in your schools.

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Objective Type Questions

Q1. A solution reacts with crushed egg-shells to give a gas that turns lime water milky, the solution contains

1. NaCl
2. HCl
3. LiCl
4. KCl

Q2. Which one of the following types of medicines is used for treating indigestion ?

1. Antibiotic
2. Antacid
3. Analgesic
4. Antiseptic

Q3. What happens when a solution of an acid is mixed with a solution of a base in a test tube ?

1. The temperature of the solution increases
2. The temperature of the solution decreases
3. The temperature of the solution remains same
4. Salt formation takes place

Q4. An aqueous solution turns red litmus solution blue excess addition of which of the following solution would reverse the change ?

1. Baking powder
2. Ammonium hydroxide solution
3. Lime
4. Hydrochloride acid

Q5. Which of the following does not contain water of crystallization?

1. Blue vitriol
2. Baking soda
3. Washing soda
4. Crypsum

Q6. Sodium carbonate is a basic salt because it is a salt of

1. Strong acid and strong back
2. Weak acid and weak base
3. Weak acid and strong base
4. Strong acid and weak base

Q7. Calcium phosphate is present in tooth enamel, its nature is

1. Basic
2. Acidic
3. Neutral
4. Amphoteric

Q8. Which of the following substances will not give carbon dioxide on treatment with dilute acid ?

1. Marble
2. Lime
3. Limestone
4. Baking soda

Q9. Which one of the following can be used as an acid base indicator by a visually impased student ?

1. Phenolphthalein
2. Vanilla essence
3. Litmus
4. Turmeric

Q10. Which of the following phenomena occurs when a small amount of acid id added to water ?

1. Ionisation
2. Salt formation
3. Neutralisation
4. Dilution

Subjective Type Questions

Q11. What are Olfactory indicators ? Explain with examples ?

Q12. While diluting an acid, why is it recommended that the acid should be added to water and not water to acid ?

Q13. Why does diluted water not conduct electricity, whereas rain water does ?

Q14. Why milkman adds a very small amount of baking soda to fresh milk explain ?

Q15. Identify the composed X on the basis of the reactions given below also write the name and chemical formula of A, B, C

Answer Key : Acids, Bases and Salts

1. (b)

2. (b)

3. (a, d)

4. (d)

5. (b)

6. (c)

7. (c)

8. (b)

9. (b)

10. (a, d)

Solutions

Ans 11. An Olfactory indicator is a substance whose smell varies depending on whether it is mixed into an acidic or basic solution, it can be used in laboratory to test whether a solution is a base or an acid. Onion and vanilla extract are example.

Ans 12. Dilution of a concentrated acid is a highly exothermic reaction a lot of heat is generated. Care must be taken while mixing concentrate acid with water, the acid must always be added slowly to water with constant stirring. If water is added to the concentrated acid, the heat generated may cause the mixture to splash out and cause burns the glass container may also break due to excessive local heating.

Ans 13. Distilled water is free from dissolved ions and hence, can’t conduct electricity. Rain water on the other hand dissolves atmospheric gases like CO₂, SO₂, NO₂ etc to form acid like H₂CO₃, H₂SO₄ and HNO₃ the amount of these acids is very low but since they can easily dissociate into ions they enable rain water to conduct electricity.

Ans 14. Milk sows easily at lower pH and gets curdled and spoiled so to prevent the spoilage of milk the milk man adds a very small amount of baking soda (alkaline) presence of baking soda makes milk alkaline for the conversion lactose to lactic acid by fermentation, which results in curd formation, an acidic pH is needed so this milk will take a longer time to set as curd.

Ans 15. X→NaOH (Sodium hydroxide)

Y→ NO₂ZnO₂ (Sodium zincate)

B→NaCl (Sodium chloride)

C→CH₃COONO (Sodium acetate)