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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

An aqueous solution feels soapy and turns red litmus blue. In which range is its pH most likely to be?Blue litmus turns red in a solution. Then sodium hydroxide is added drop by drop. What happens near the neutralisation point?Why does the solution become warm when acid is added to water?An unknown gas turns lime water milky but does not give a pop sound near a burning splint. Which gas is it?If a salt solution turns red litmus blue, which could be a possible example?Turmeric as a natural indicator is especially useful for identifying which type of solution?If one solution has one hundred times more hydrogen ions than another solution, by how much will its pH be lower approximately?An acid reacts with zinc to give one gas and with sodium carbonate to give another gas. What are the correct identities of the two gases?What is the colour of methyl orange in an acidic solution?A solution has pH 7 but contains a dissolved salt. Which salt is most likely?Which substance is used for bleaching in the textile industry?When sodium carbonate crystals are heated, their hydrated nature decreases. This is related to which idea?When acid and base are added dropwise separately to a solution, its pH changes each time. What does this show?Why is care needed while mixing a strong base with water?If a substance gives hydroxide ions in water, what effect will its solution show on an indicator?Which pair is a correct daily-life example of neutralisation?If a small amount of acid falls on the skin, what should be the first safe step in the laboratory?When acid is added to a solution, its pH goes below 7. Which ion has become relatively more abundant?Which statement about the nature of salts is incorrect?If baking soda is heated, what will be the main substance in the solid residue?