Class 10 Science - WEST-BENGAL
Acids, Bases and Salts
The chapter Acids, Bases and Salts in Class 10 WBBSE Science explores the fundamental chemical behavior of different substances. Students learn about indicators, the pH scale, chemical properties of acids and bases, and the formation and uses of important salts like sodium chloride, washing soda, and baking soda. This chapter is extremely crucial for the West Bengal Board examinations as it forms the basis of inorganic chemistry, frequently featuring in MCQs, short answers, and numerical or reasoning-based questions. Mastering this chapter ensures a strong foundation for scoring high marks in chemistry.
Start Learning FreeKey Concepts
Indicators
Substances that change color in acidic or basic mediums to indicate the nature of the solution, such as litmus, methyl orange, and phenolphthalein.
Chemical Properties of Acids and Bases
Acids react with metals to release hydrogen gas, while bases react with acids in a neutralization reaction to form salt and water.
The pH Scale
A logarithmic scale ranging from 0 to 14 used to measure the hydrogen ion concentration in a solution, where 7 is neutral, below 7 is acidic, and above 7 is basic.
Chlor-alkali Process
The electrolysis of an aqueous solution of sodium chloride (brine) that produces chlorine gas, hydrogen gas, and sodium hydroxide.
Water of Crystallization
The fixed number of water molecules chemically bound in one formula unit of a salt, such as copper sulfate pentahydrate or gypsum.
Important Formulas
Board Exam Info
In the West Bengal Board (WBBSE) Class 10 Physical Science exam, this chapter typically carries around 5 to 8 marks. Questions usually include multiple-choice questions (MCQs), very short answer type questions (VSA), short explanatory questions on chemical reactions, and reasoning questions based on pH and salt applications.
Frequently Asked Questions
Why does dry HCl gas not change the color of dry litmus paper?
Dry HCl gas does not dissociate into hydrogen ions (H+) in the absence of water. Ions are required to exhibit acidic properties and change the color of litmus paper.
What is Plaster of Paris and how is it prepared?
Plaster of Paris is calcium sulfate hemihydrate. It is prepared by heating gypsum (calcium sulfate dihydrate) at 373 K, causing it to lose water molecules.
Why should sour substances like curd or tamarind not be kept in brass and copper vessels?
Curd and tamarind contain acids which react with the metal vessels (brass and copper) to form toxic salts that can cause food poisoning.
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