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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 student dissolves a metal oxide in water and the resulting solution turns red litmus blue. What does this prove about the metal oxide?Which statement correctly compares acids and bases?A solution has pH less than 7 and reacts with a metal carbonate to release a gas. By which test will this gas be identified?In which order does acidity decrease and basicity increase?An unknown white solid reacts with acid to give carbon dioxide, and its aqueous solution is basic. Which solid is most likely?An acidic solution is diluted ten times. If the initial pH was 3, what will be the approximate new pH?The pH of a solution changes from 4 to 2. What happened to the hydrogen-ion concentration?A salt solution shows pH 3. From which type of acid and base can this salt be formed?A salt solution shows pH 9. It is more likely formed from what?Two acids of equal concentration are compared and the first shows higher electrical conductivity. Which conclusion is correct?Why does hydrochloric acid show a stronger acidic effect than ethanoic acid at the same concentration?Dry hydrogen chloride gas has no effect on dry litmus but turns blue litmus red after dissolving in water. What is the reason?Ammonia turns moist red litmus blue but not dry red litmus. What does this show?A substance gives carbon dioxide with acid and its solution is basic. Which substance can it be?How is the gas formed in the reaction of an acid with hydrogen carbonate confirmed?Why does the milkiness of lime water disappear when excess carbon dioxide is passed?Why is it safe to add acid slowly into water?If water is suddenly added to concentrated acid, what is the main danger?Why does sodium hydroxide not remain pure when kept in open air?What is the scientific reason for storing bleaching powder in a dry closed container?