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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

Baking powder does not react strongly when dry but gives gas in moist dough. What is the main reason?Copper oxide forms a coloured salt solution when added to dilute acid. What nature of copper oxide is shown?Methyl orange is yellow and phenolphthalein is pink in a solution. Which ion is likely to be in excess?Equal volumes of an acid and a base are mixed, but pH does not become 7. Which reason is most scientific?Which substance obtained from common salt is useful as an important base in paper and soap industries?If an acidic solution is diluted with water and its pH changes from 2 to 4, what happens to its hydrogen-ion concentration?The usefulness of bleaching powder depends on available chlorine. What is the best reason for storing it in a closed container?A solution turns blue litmus red but does not release hydrogen when copper metal is added. What should be understood?A soil has pH 9. What is the general idea to balance it for crops?An acidic gas changes the colour of moist litmus but has no effect on dry litmus. Why does it not affect dry litmus?Which pair shows the correct common name and chemical name?If an aqueous solution feels soapy and turns turmeric reddish-brown, what will be its nature?The gas obtained from an acid-metal reaction gives a pop sound near a burning splint. What is the conclusion of this test?A solution has pH 7 and the universal indicator gives a light green colour. What nature does this indicate?Which insoluble substance first forms when carbon dioxide is passed through lime water?A student says identifying acids by taste is the simplest method. Why is this idea wrong in the laboratory?A small amount of base is added to an acidic solution and pH changes from 2 to 3. What is the correct conclusion?Why does adding a suitable amount of slaked lime to acidic soil increase the pH?Which statement about salts is correct?If an aqueous solution has pH close to 14, what careful conclusion should be taken while handling it?