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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 unknown solution turns red litmus blue and turmeric reddish brown. What is the nature of the solution?In which situation will phenolphthalein turn from colourless to pink?If the pH of a solution increases from 3 to 6, what happens to its acidic nature?If two solutions have pH values 2 and 5 respectively, which solution is more acidic?Why is hydrochloric acid considered stronger than ethanoic acid at equal concentration?Which aqueous solution is expected to produce the highest amount of hydroxide ions?To prevent tooth decay, it is better for the pH of the mouth to remain above about which value?How does a basic toothpaste help after eating food?Which substance can be suitable to treat acidic soil for farming?Which substance can help reduce excessive basicity of basic soil?Which salt is formed in the reaction between sodium hydroxide and hydrochloric acid?Why does phenolphthalein turn pink in sodium carbonate solution?Why is the pH of an aqueous solution of common salt approximately 7?Which gas is released on heating baking soda and turns lime water milky?Why is a mild acid mixed with baking soda in baking powder?What is the main difference between baking soda and baking powder?Why is washing soda used to soften hard water?Why can bleaching powder slowly lose its effectiveness when kept exposed?Why is bleaching powder used in cleaning drinking water?Why is gypsum heated at a controlled temperature rather than at too high a temperature?