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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
→On heating a sample, water droplets appear and its colour changes. This may identify what kind of salt?
Class 10 · Science · Medium
→What will be the nature of sodium carbonate formed by heating baking soda?
Class 10 · Science · Medium
→The gas from an acid-metal reaction is collected in soap bubbles and burns with a pop sound. What does this confirm?
Class 10 · Science · Medium
→If a student first takes acid in a beaker and then adds water while diluting acid, what is the main mistake?
Class 10 · Science · Hard
→Why can relief methods for an ant sting and a scorpion sting be different?
Class 10 · Science · Medium
→Why would it be wrong to call a solution with pH 8 neutral?
Class 10 · Science · Hard
→What can happen to setting if too much water is used while making a plaster of Paris statue?
Class 10 · Science · Hard
→A sample turns red litmus blue but does not give carbon dioxide when acid is added. What could it be?
Class 10 · Science · Medium
→Which statement correctly relates acid rain and carbonate rocks?
Class 10 · Science · Medium
→What is the main process behind the decrease in pH during tooth decay?
Class 10 · Science · Medium
→If soil has very low pH and too much lime is added, what problem may occur?
Class 10 · Science · Medium
→What is the major risk of storing sodium hydroxide in an acid bottle?
Class 10 · Science · Medium
→Why may washing soda crystals gradually appear like a white powder when left exposed to air?
Class 10 · Science · Medium
→If an acid solution has very little water, why may its electrical conductivity appear low?
Class 10 · Science · Medium
→Why do acidic properties become clear when hydrogen chloride gas dissolves in water?
Class 10 · Science · Easy
→Methyl orange turns yellow and phenolphthalein turns pink in a solution. What is the nature of the solution?
Class 10 · Science · Medium
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