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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 solution giving blue colour with universal indicator turns green after acid is added. What does this mean?A student says carbonates give hydrogen with acids. What is the correct correction?If sodium hydroxide is slowly added to an acidic solution, what main ionic change occurs during neutralisation?A substance forms salt and water with acid but is insoluble in water. What is it called?For preparing bleaching powder, chlorine gas is passed over which substance?Why does an acidic solution not always become basic immediately even after strong dilution with water?Why is it not correct to identify a colourless solution as acid or base only by looking at it?A solution turns blue litmus red but the same substance in dry form has no effect on litmus. What is the most appropriate reason?The pH of a solution changes from 2 to 5. What happens to the hydrogen ion concentration?A salt solution shows pH 10. From which type of acid and base is it more likely formed?A gas turns lime water milky and in excess removes the milkiness. This gas is most likely formed from what?Two acids have the same concentration. The first acid shows higher electrical conductivity. Which conclusion is more correct?Why is it considered safe to add acid slowly into water during dilution?A gas turns moist red litmus blue but has no effect on dry red litmus. What is the correct conclusion about the gas?Which gas is formed at the cathode in the chlor-alkali process and how is it identified?Gypsum forms plaster of Paris on controlled heating. What problem can occur on excessive heating?Methyl orange is red and phenolphthalein is colourless in a solution. Which substance is suitable to neutralise it?What are the two main reasons for sodium hydroxide becoming wet and less pure in open air?An unknown substance dissolves in water to give a basic solution and gives a gas with acid that turns lime water milky. Which substance could it be?Below which pH range is the risk of tooth enamel dissolving considered higher?