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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

Lime is added to an acidic lake and the pH of water increases. Which process is this an example of?A student says carbon dioxide is not an acid, so it cannot react with a base. What is the correct evaluation?Methyl orange is red in a solution, but it becomes yellow when base is added slowly. What does this show?Why does baking powder not react vigorously in dry state even though it contains baking soda and an acidic substance?The temperature rises slightly when sodium hydroxide is added to an acidic solution. What is the reason?A solution had pH 3 and after dilution it became pH 5. By how much did the hydrogen ion concentration decrease?If copper oxide is added to dilute hydrochloric acid, a blue-green solution may form. What nature does this prove?Sodium hydroxide kept in open air can be affected not only by moisture but also by carbon dioxide. Which substance can form?Phenolphthalein becomes pink and turmeric becomes reddish-brown in a solution. Which ion is likely to be in excess?If equal volumes of an acid and a base are mixed but the pH does not become 7, what could be a possible reason?In an industrial process, three products are obtained from brine. One of them is a base useful in paper and soap industries. Which base is it?The gas released on heating baking soda turns lime water milky. What is the identity of the gas?If a substance forms salt and water with an acid but is insoluble in water, how should it be classified?Red litmus turns blue in a solution, and after adding acid both red and blue litmus show no change. What is the nature of the final solution?Why is the pH of acid rain lower than that of normal rain?Which option correctly shows the relationship among gypsum, plaster of Paris, and water?A solution is acidic but very dilute. Around what pH can it be?If a solution has pH close to 14 and feels slippery on skin, what is the safest conclusion?Why is bleaching powder used for disinfecting drinking water?Adding sodium carbonate to a solution gives no gas, but adding acid to sodium carbonate gives gas. What does this indicate?