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
When an acidic solution is neutralised by a base, what determines the nature of the salt formed?If a solution has more hydroxide ions and fewer hydrogen ions, what colour may universal indicator show?If a basic substance is highly soluble in water and can burn skin, how should it be used in the laboratory?A student says all acids give the same amount of hydrogen gas with metals. Why is this statement wrong?A solution gives one gas with zinc and another gas with sodium carbonate. What is the correct identification of both gases?Two solutions have pH values 2 and 6 respectively. How much greater is the hydrogen ion concentration in the first solution than in the second?A student passes dry hydrogen chloride over dry blue litmus and observes no change. The same gas turns moist blue litmus red. What is the correct reason?If the pH of a basic solution changes from 12 to 9, which statement about the effect of hydroxide ions is most correct?An aqueous solution of a salt turns red litmus blue. From which pair is this salt more likely to be formed?A sample gives carbon dioxide with acid and its aqueous solution turns red litmus blue. Which substance is most likely?Why is the membrane considered important in the chlor-alkali process?Why does the risk of splashing increase when an acid is mixed with water very quickly?Which statement correctly explains the difference between a strong base and a concentrated base?An unknown solid gives water droplets and changes colour on heating. Its colour returns after adding water. This indicates the presence of what?When gypsum is heated at a controlled temperature, how much water remains in the product formed?If hydrogen ions are much more numerous than hydroxide ions in a solution, which colour is more likely with universal indicator?Ammonium chloride solution can turn blue litmus red. What is the most appropriate reason?If one metal gives no gas with an acid and another metal gives gas rapidly with the same acid, what is the correct basis of comparison?When hard water is mixed with aqueous washing soda, hardness decreases. What is the main reason?From the pH point of view, why is cleaning the mouth after meals useful for teeth?