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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

Phenolphthalein turns pink in sodium hydroxide solution. The colour disappears when acid is added slowly. What is the reason?Which statement is correct when an acidic solution is diluted with water?In the manufacture of bleaching powder, chlorine gas reacts with which substance?In the chlor-alkali process, what is formed at the cathode during electrolysis of concentrated sodium chloride solution?Blue copper sulphate crystals turn white on heating. This change occurs due to removal of what?Why is plaster of Paris kept away from moisture in a closed container?Methyl orange turns red in a solution and phenolphthalein remains colourless. What is the nature of the solution?Why do farmers add slaked lime to soil when its pH is too low?How does an antacid give relief during excess acidity in the human stomach?Why should curd and sour substances not be kept in brass or copper vessels?A solution turns red litmus blue. On adding acid, heat is released and a salt is formed. What type of reaction is this?Tooth decay starts rapidly when the pH falls below which value?Which statement correctly explains the difference between a strong acid and a concentrated acid?Why is a mild edible acid mixed with baking soda in baking powder?How many molecules of water of crystallisation are present in one molecule of washing soda?Why does heating gypsum at about 373 K produce plaster of Paris?All bases are not soluble in water. Which statement is most correct?A solution has pH close to 14. Why can touching it be dangerous?Sodium chloride is a salt formed from acidic and basic sources. Why is the pH of its aqueous solution about 7?If the amount of hydroxide ions in a solution is increased, what will happen to its pH?