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Subjects

Science

Acids, Bases, and Salts

अम्ल, क्षारक और लवण

In Class 10 Science, under the chapter Chemical Substances – Nature and Behaviour, students study acids, bases, and salts through their properties, reactions, and everyday examples. The topic explains how these substances behave with indicators and with one another, including neutralisation, and introduces the formation and practical importance of common salts.

Practice questions

A student suggests identifying an acidic solution by taste. Why is this suggestion unacceptable in the laboratory?If blue litmus turns red in a solution and electric current also passes through it, which conclusion is strongest?A sodium chloride solution has pH about 7 but conducts electricity. What idea does this clarify?A soil has pH 5 and crops are not growing well. Which method is scientifically more suitable?Water is added to an acidic solution but it remains acidic. What is the correct reason?Which pair correctly matches the chemical name and common name?Adding acid to a solution gives no carbon dioxide, but adding zinc gives hydrogen. What nature could the solution already have?A student says every base dissolves in water. What is the correct correction?What is the similarity in the reaction of carbonates and hydrogen carbonates with acids?If blue litmus turns red in a solution and its pH is 2, what changed when adding water makes the pH 4?What is the correct scientific reason for avoiding storage of curd in copper or brass vessels?If a salt is formed by mixing an acid and a base, when is its aqueous nature most likely to be neutral?A student says acids only turn blue litmus red and show no other chemical property. Which response is correct?In an experiment, solution A turns blue litmus red and solution B turns red litmus blue. When mixed in suitable amounts, the temperature rises slightly. This proves which reaction?An acidic solution has pH 4. If it is made one thousand times less acidic, what will be the approximate new pH?An unknown salt solution shows pH 8.5 and turns red litmus blue. What type of salt is it most likely to be?An acid is added to a white solid and a gas evolves that turns lime water milky. Excess of the same gas removes the milkiness. What is the final soluble substance?If an acid is less electrically conducting than another acid of the same concentration, what is the most appropriate conclusion?Which is the safe method for mixing acid with water?A gas turns moist blue litmus red but has no effect on dry blue litmus. What does this prove?