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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

A question asks to identify an acid or base only by taste. What is the correct exam-based response?In an acidic solution, zinc first releases a gas and then limestone releases another gas. What is the correct identification of both gases?One solution has pH 1 and another has pH 4. How much greater is the hydrogen ion concentration in the first solution?A salt solution shows pH 9 and turns red litmus blue. From which type of acid and base could it be formed?Carbon dioxide first makes lime water milky and then removes the milkiness in excess. Why does this happen?Among two acids of equal concentration, one has lower pH and higher conductivity. What type of acid is it likely to be?While diluting acid, why should acid be added to water instead of adding water to acid?A moist gas turns red litmus blue but has no effect on dry litmus. What is the most correct conclusion about the gas?How is the gas formed at the cathode in the chlor-alkali process tested?Why is controlled heating of gypsum necessary?Methyl orange is red and phenolphthalein is colourless in a solution. What should be added to neutralise it?Why can sodium hydroxide pellets become wet and later impure in open air?A substance dissolves in water to form a basic solution and gives carbon dioxide with acid. What is the most suitable identification?To protect tooth enamel from dissolving, it is better to keep mouth pH above which limit?Why does sodium chloride solution conduct electricity even though it is neutral?The effect of acid rain on marble buildings is more evident because marble contains which substance?On heating baking soda, the remaining solid solution turns red litmus blue. What is the identity of the remaining solid?If hydroxide ions are slowly added to an acidic solution, why will its pH increase?A basic solution changes from pH 14 to pH 11. Approximately how did its basicity change?Copper oxide forms salt and water when added to dilute acid. What is the nature of copper oxide?