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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 plaster of Paris formed when gypsum is heated in a controlled way?Blue crystals of copper sulphate become white on heating. What does this change prove?When a drop of water is added to white anhydrous copper sulphate, the blue colour returns. What is the main reason?What is one important advantage of adding a mild acid in baking powder?The gas formed on strong heating of baking soda turns lime water milky. Which gas is it?In the chlor-alkali process, which product is formed at the cathode during electrolysis of brine?At which electrode is chlorine gas formed in the chlor-alkali process?Sodium hydroxide produced in the chlor-alkali process is useful in which industry?In making bleaching powder, slaked lime reacts with which gas?Bleaching powder is used for disinfecting water because of which property?Which substance is used to soften hard water?If soap does not lather in hard water but starts lathering after adding washing soda, what is the correct reason?What change in nature is shown when the pH of a solution changes from seven to eleven?When pH changes from three to six, which conclusion is most correct?Which pair will undergo a neutralisation reaction when mixed?The temperature rises during the reaction between an acid and a base. What does this indicate about the reaction?Why should acid always be added slowly to water while diluting?What is the main difference between a concentrated acid and a strong acid?Which is the correct description of a weak acid?In which condition will phenolphthalein change from colourless to pink?