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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

Why is aqueous sodium chloride electrically conducting even though it is neutral?Acid rain affects marble mainly because of which substance in marble?On heating baking soda, the aqueous solution of the remaining solid is basic. What is the name of the remaining solid?Why does pH increase when hydroxide ions are added to an acidic solution?A basic solution changes from pH 13 to pH 10. Approximately how did its basicity change?Copper oxide forms salt and water with acid. What nature of copper oxide is proved by this?Turmeric becomes reddish-brown and phenolphthalein becomes pink in a solution. What is the nature of the solution?Even after mixing equal volumes of acid and base, the solution remains acidic. What is the most likely reason?Which important base is obtained by electrolysis of aqueous common salt solution?If pH changes from 4 to 7, what happens to the hydrogen-ion concentration?What is the main reason for storing bleaching powder in a dry, closed container?An acidic solution produces brisk bubbles with magnesium but not with silver. What does this observation show?A soil sample has pH 9. Which is a more suitable way to improve its condition for crops?An acidic gas has no effect on dry blue litmus but turns moist blue litmus red. Why?Which pair is correctly matched?An aqueous solution has pH 12 and feels soapy. What is the safest conclusion?Which test identifies the gas released when an acid reacts with an active metal?If the effects of hydrogen and hydroxide ions in a solution are approximately balanced, what colour will a universal indicator show?When carbon dioxide is passed into limewater, which substance causes the milkiness?Why is identifying an acid by taste unacceptable in the laboratory?