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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

An indicator shows red in acidic solution and yellow in basic solution. Which indicator could it be?A question suggests using only taste to identify acids, bases, and salts. What is the most correct response from an exam point of view?An unknown solution turns blue litmus red and gives a gas with zinc. When sodium carbonate is added to the same solution, another gas is released. What is the correct identification of both gases?A solution has pH 3. If the hydrogen-ion concentration becomes one hundred times lower, what will be the approximate new pH?A salt solution turns blue litmus red. From which type of acid and base is it most likely formed?A gas first turns lime water milky and removes the milkiness when passed in excess. Which soluble substance forms in excess?Why does hydrochloric acid have a lower pH than ethanoic acid at the same concentration?Washing soda crystals become powdery when kept in open air. This is related to which phenomenon?What is one important use of the gas formed at the anode in the chlor-alkali process?When gypsum is heated under controlled conditions, plaster of Paris is formed. How does the water content change?If phenolphthalein is added to an acidic solution and then a base is added slowly, when will the pink colour appear?Which two factors can reduce the quality of sodium hydroxide when it is kept in open air?A substance dissolves in water, turns red litmus blue, and gives carbon dioxide with acid. Which substance could it be?A solution has pH below 5.5. What is the most correct meaning in the context of teeth?Why does sodium chloride solution conduct electricity even though its pH is near 7?The effect of acid rain on marble is due to which reaction?The solid formed on heating baking soda gives a basic aqueous solution. Which solid is it?If hydroxide ions are added to an acidic solution, what change will occur first?If the pH of a basic solution changes from 13 to 11, approximately how did its basicity change?Magnesium and copper are separately added to an acid. Magnesium gives bubbles but copper does not. What is the correct reason?