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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

By which test can the gas formed at the cathode in the chlor-alkali process be identified?Gypsum forms plaster of Paris on controlled heating. Why is excessive heating a problem?Phenolphthalein is colourless and methyl orange is red in a solution. What is the nature of this solution?Why can sodium hydroxide pellets become wet and then less pure in open air?A substance gives carbon dioxide with acid and forms a basic solution in water. Which substance is most suitable?If a solution can damage tooth enamel, in which pH range is it more likely to be?A student says sodium chloride is neutral, so its solution will not have ions. Why is this wrong?What is the main chemical reason for the effect of acid rain on marble?A sample is heated, gas is released, and the solution of the remaining solid is basic. If the sample was baking soda, what is the remaining solid?If a solution of pH 2 is compared with a solution of pH 5, how much more acidic is the first solution?Washing soda helps remove which ions from hard water?Plant roots are not growing well in highly acidic soil. Which substance will be useful in a suitable amount?Why is it proper to protect bleaching powder from moisture and open air?Red litmus turns blue in a solution. Acid is added gradually, and finally both litmus papers show no change. What is the final state?If a little base is added to an acidic solution and its pH changes from 3 to 4, what is the correct conclusion?Which statement best describes the general nature of metal oxides?The aqueous solution of a non-metal oxide turns blue litmus red. What is the nature of the non-metal oxide?Why are baking soda and an edible acid both kept in baking powder?A blue salt becomes white on heating and turns blue again when water is added. Which salt could it be?If a few drops of acid fall on the skin, what should be done first?