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Class 10 · Science · Medium
→A substance dissolves in water, turns red litmus blue, and feels soapy. Which ion will mainly be present?
Class 10 · Science · Medium
→Why is the gas formed by adding a metal to an acid not obtained with every metal?
Class 10 · Science · Medium
→Which substance dissolves in water to form a basic solution and also releases carbon dioxide with an acid?
Class 10 · Science · Easy
→If the amounts of hydrogen ions and hydroxide ions in a solution are nearly balanced, what will its pH be like?
Class 10 · Science · Easy
→How does the gas formed when sodium hydrogen carbonate reacts with an acid help food rise?
Class 10 · Science · Medium
→A student says that pH zero means there is no acid. What is the correct evaluation?
Class 10 · Science · Easy
→If plant growth is poor in acidic soil, which substance can be carefully used to improve its pH?
Class 10 · Science · Easy
→Which option is most appropriate for the safe storage of acids and bases?
Class 10 · Science · Medium
→An aqueous acid solution conducts electricity, but the pure acid conducts poorly. What does this observation support?
Class 10 · Science · Medium
→Magnesium produces a gas when added to an acidic solution. If sodium carbonate is added to the same solution, which other gas will be released?
Class 10 · Science · Medium
→Which property of bleaching powder makes it useful for whitening clothes?
Class 10 · Science · Medium
→Under which condition can carbon dioxide remove the milkiness of lime water?
Class 10 · Science · Hard
→Why does an aqueous solution of sodium chloride conduct electricity even though it may be neutral?
Class 10 · Science · Medium
→Why does pH increase when hydroxide ions are added to an acidic solution?
Class 10 · Science · Hard
→If a salt is formed from a strong base and a weak acid, what effect will its aqueous solution generally show on red litmus?
Class 10 · Science · Medium
→A solution shows pH 11, but after adding much water its pH becomes 9. What does this correctly mean?
Class 10 · Science · Medium
→Which substance can absorb an acidic gas and form a salt?
Class 10 · Science · Medium
→Blue litmus turns red in a solution, and bubbles form when chalk powder is added to it. What is the correct conclusion?
Class 10 · Science · Hard
→Why is there a risk of harmful substances forming when lemon juice is stored in a copper vessel?
Class 10 · Science · Medium
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