Class 10 Chemistry Chapter 10
Study of Compounds : Sulphuric Acid
Important Questions

Here, you'll discover significant inquiries pertaining to Chapter 10: Study of Compounds : Sulphuric Acid for ICSE Class 10 Chemistry. These inquiries are carefully designed to aid students in preparing for the ICSE Class 10 Chemistry Examination in 2023–24. Engaging with different question formats allows students to address uncertainties, improve their exam preparedness, boost their self-assurance, and polish their ability to solve problems.

Introduction

In ICSE Class 10 Chemistry Chapter 10 "Study of Compounds: Sulphuric Acid," you will delve into various aspects of sulphuric acid. The chapter covers the manufacturing process using the Contact Process, along with equations and relevant conditions where applicable. Furthermore, you will explore sulphuric acid's behaviour when in a diluted state, examining its reactions with various substances such as metals, metal oxides, metal hydroxides, metal carbonates, metal bicarbonates, metal sulphites, and metal sulphides. The chapter also delves into the concentrated sulphuric acid's role as an oxidising agent, focusing on its capacity to oxidise carbon and sulphur. Additionally, it explores sulphuric acid's role as a dehydrating agent, specifically in the dehydration of sugar and the formation of Copper (II) sulphate crystals. Moreover, you will learn about the non-volatile nature of sulphuric acid and its reactions with sodium or potassium chloride and sodium or potassium nitrate. These insights into sulphuric acid's properties and reactions will deepen your understanding of this important compound and its applications in various chemical processes.

What is Study of Compounds : Sulphuric Acid ?

In ICSE Class 10 Chemistry Chapter 10 "Study of Compounds: Sulphuric Acid," the focus is on a detailed examination of the chemical compound known as sulphuric acid (H₂SO₄). This chapter provides comprehensive coverage of various aspects related to sulphuric acid, serving as a foundational study for students. Sulphuric acid is a crucial compound in the realm of chemistry and industry, and this chapter delves into its key attributes and applications. It encompasses the following key areas:

• Manufacture by Contact Process: Students will learn about the industrial process of manufacturing sulphuric acid, often referred to as the Contact Process. The chapter includes equations and discusses relevant conditions where applicable, providing insights into the production of this vital chemical.
• Behaviour as an Acid in Dilute Solutions: The chapter explores how sulphuric acid behaves when it is in a diluted state. This involves a detailed examination of its reactions with various substances, including metals, metal oxides, metal hydroxides, metal carbonates, metal bicarbonates, metal sulphites, and metal sulphides.
• Concentrated Sulphuric Acid as an Oxidising Agent: Concentrated sulphuric acid is known for its role as an oxidising agent. The chapter covers the oxidation of carbon and sulphur, demonstrating sulphuric acid's capacity to bring about oxidation reactions.
• Concentrated Sulphuric Acid as a Dehydrating Agent: Sulphuric acid also serves as a potent dehydrating agent. Students will learn about two significant examples of this property: the dehydration of sugar and the formation of Copper (II) sulphate crystals.
• Non-Volatile Nature of Sulphuric Acid: This section highlights the non-volatile nature of sulphuric acid, meaning it does not readily evaporate. It explores sulphuric acid's reactions with sodium or potassium chloride and sodium or potassium nitrate to illustrate this property.

Overall, this chapter provides students with a comprehensive understanding of sulphuric acid, its unique properties, and its diverse roles in various chemical reactions and processes. The knowledge gained from this chapter is essential for a thorough grasp of chemistry and its practical applications.

Class 10 Chemistry Chapter 10 Study of Compounds : Sulphuric Acid Important Questions and Answers

Q1. H₂SO₄ is a _________ ?

Options

(a) Monobasic acid
(b) Diacidic base
(c) Monoacidic base
(d) Dibasic acid

Ans. (d) Dibasic acid

Explanation:
H₂SO₄ when dissolved in water shows the following reactions:
H₂SO₄ + H₂O ⇌ H3O⁺ + HSO₄^-
HSO₄^- + H₂O ⇌ H₃O⁺ + SO₄^-
Since it forms hydronium ions with water, i.e., it donates H⁺ ion. Therefore, it is acidic in nature. Also, it donates two H⁺ in two stages; therefore, it is dibasic in nature. Hence sulphuric acid is a dibasic acid.

Q2. Pyrosulphuric acid is the chemical name of:

Options

(a) Green vitriol
(b) White vitriol
(c) Oleum
(d) Gypsum

Ans. (C) Oleum
Explanation:
Oleum is a common name of a compound having molecular formula H₂S₂O₇. This compound is also known as pyrosulphuric acid. It is produced during the manufacturing of sulphuric acid in the contact Process.

Q3. Why is brisk effervescence seen when H₂SO₄ is added to sodium carbonate?

Explanation:
When sulphuric acid is added to sodium carbonate it liberates carbon dioxide which produces brisk effervescence.

Q4. Give examples of the use of sulphuric acid as :
(i) An electrolyte in everyday use. 
(ii) A non-volatile acid. 
(iii) An oxidising agent.

Explanation:
(i) In lead accumulators or in storage batteries.
(ii) In the manufacture of other acids like nitric acid, hydrochloric acid and phosphoric acid.
(iii) For cleaning metals before enamelling, electroplating and galvanising, as a pickling agent.

Q5. What happens when concentrated sulphuric acid is added to a lump of blue vitriol.

Explanation:
When concentrated sulphuric acid is added to hydrated copper sulphate, it loses its water of crystallisation and thus white anhydrous copper (II) sulphate is formed. In other words, The blue coloured hydrated (II) sulphate turns white due to the loss of water from crystallisation.
\(\underset{\underset{\text{(Blue crystals)}}{\text{hydrated copper sulphate}}}{CuSO_4.5H_2O}+\underset{\text{Conc}}{[H_2SO_4]} → \underset{\underset{\text{(White crystals)}}{\text{Anhyrous copper sulphate}}}{CuSO_4}+[H_2SO_4.5H_2O]\)

ICSE Class 10 Chemistry Chapter wise Important Questions

Conclusion

The exploration of "Study of Compounds: Sulphuric Acid" in ICSE Class 10 Chemistry has provided a deep and comprehensive understanding of this essential chemical compound. Throughout this chapter, we've delved into the manufacturing process of sulphuric acid through the Contact Process, examining equations and the relevant conditions. For those aiming to excel in the realm of chemistry, additional practice and resources are invaluable. To facilitate your learning process and strengthen your grasp of sulphuric acid, oswal.io offers a comprehensive collection of questions and study materials. These resources not only provide opportunities to assess your knowledge but also offer avenues to enhance your proficiency in this intriguing field.

Frequently Asked Questions

Q1 : Why is water not added to concentrated H₂SO₄ in order to dilute it?

Ans: The reaction between water and concentrated H₂SO₄ is an exothermic reaction. If water is added to the concentrated acid, the temperature increases suddenly. As the acid is in larger quantities, it gushes out enormously with severe repercussions.

Q2: Give the odour of gas evolved and name the gas produced when sodium sulphide is added to a solution of HCl in the water?

Ans:  The gas that is evolved when sodium sulphide is added to a solution of HCl is Hydrogen sulphide. The odour of Hydrogen sulphide is that of rotten eggs.

Q3 : Which property of sulphuric acid accounts for its use as a dehydrating agent?

Ans: The property of sulphuric acid accounting for its property of a dehydrating agent is its strong affinity towards water.

Q4 : Why must the impurity of arsenic oxide be removed before passing the mixture of SO₂ and air through the catalytic chamber?

Ans:  Impurities of arsenic oxides must be removed before it is passed through the mixture of SO₂ and air through the catalytic chamber as these impurities are toxic to the catalyst. It poisons thereby deactivating the catalyst.

Q5 : (a) Name the acid formed when sulphur dioxide dissolves in water
(b) Name is released when sodium carbonate is added to a solution of sulphur dioxide.

Ans: (a) When sulphur dioxide is dissolved in water, sulphuric acid is formed
(b) When sodium carbonate is added to a solution of sulphur dioxide, carbon dioxide is released.