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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

Why is acid rain harmful for aquatic organisms in lakes?If one solution turns red litmus blue and another turns blue litmus red, what is likely to form when they are mixed?Metal oxides react with acids to form salt and water. What general nature of metal oxides does this prove?The aqueous solution of a non-metal oxide is acidic. Why can it react with lime water?What is the chemical reason for avoiding storage of curd in copper or brass vessels?Universal indicator is red in a solution. After adding water, the colour becomes orange. What does this show?A student says carbonates give hydrogen gas with acids. What is the correct correction?If blue litmus turns red and methyl orange turns red in a solution, which substance can neutralise it?A substance forms salt and water with an acid but does not dissolve in water. What is it more correctly called?In the manufacture of bleaching powder, chlorine is passed over which substance?Why does an acidic solution not immediately become basic when a large amount of water is added?A question says acids and bases should be identified only by colour. What is the most correct exam-based answer?A solution gives red colour with universal indicator. After adding water the colour becomes yellow but not green. What is the correct conclusion?An acidic solution has pH 2. If it is made ten thousand times less acidic, what will be the approximate new pH?A salt solution shows pH 6 and turns blue litmus slightly red. From what may this salt be formed?Among two acids of equal concentration, the first is a better conductor of electricity. Based on this, what can the first acid be like?A dilute acid is added to a white solid and the gas turns lime water milky. If excess gas removes the milkiness, which sequence is correct?A solution turns red litmus blue and does not release carbon dioxide when acid is added. Which substance is most likely?Why can there be a problem in the chlor-alkali process if the products are not kept separate?A blue crystalline salt becomes white on heating and turns blue again on adding water. What does this prove?