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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 gas released from a carbonate sample with acid is passed into lime water for a long time. Why can the final solution become clear again?Which salt is most likely to give an acidic solution when dissolved in water?A metal does not give hydrogen gas with an acid, but zinc gives gas in the same acid. Which conclusion is correct?Washing soda crystals become powdery when kept in open air. Which phenomenon does this illustrate?Plaster of Paris loses its usefulness when kept open for a long time. What is the best reason?Which is the correct group of three main products formed in the chlor-alkali process?Which option correctly gives an example of a strong acid and a weak acid?If equal amounts of water are repeatedly added to an acidic solution, what change is expected?Which statement about bleaching powder is most correct?A student says a concentrated acid and a strong acid are the same. What is the correct evaluation?Blue copper sulphate gives a white substance on heating. Its colour returns when water is added. What does this prove?Which solid substance is formed when sodium hydrogen carbonate is heated?Which substance is most suitable to reduce the acid present in an ant sting?If a base solution turns phenolphthalein pink, when will the pink colour disappear on adding acid?A salt solution turns red litmus blue. It may be formed from which type of acid and base?Which experiment gives the most direct evidence for the presence of ions in an acidic solution?Acid rain lowers the pH of a lake. Why can this seriously affect aquatic organisms?A solution has pH 9. Acid is added and the pH becomes 7. What reaction has occurred?Why is controlled heating necessary to make plaster of Paris from gypsum?Why does food become spongy when baking soda and an acid are mixed?