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Class 10 · Science · Medium
→If blue litmus turns red in a solution and its pH is 2, what changed when adding water makes the pH 4?
Class 10 · Science · Medium
→What is the similarity in the reaction of carbonates and hydrogen carbonates with acids?
Class 10 · Science · Medium
→A student says every base dissolves in water. What is the correct correction?
Class 10 · Science · Hard
→Adding acid to a solution gives no carbon dioxide, but adding zinc gives hydrogen. What nature could the solution already have?
Class 10 · Science · Easy
→Which pair correctly matches the chemical name and common name?
Class 10 · Science · Medium
→Water is added to an acidic solution but it remains acidic. What is the correct reason?
Class 10 · Science · Medium
→A soil has pH 5 and crops are not growing well. Which method is scientifically more suitable?
Class 10 · Science · Medium
→A sodium chloride solution has pH about 7 but conducts electricity. What idea does this clarify?
Class 10 · Science · Medium
→If blue litmus turns red in a solution and electric current also passes through it, which conclusion is strongest?
Class 10 · Science · Easy
→A student suggests identifying an acidic solution by taste. Why is this suggestion unacceptable in the laboratory?
Class 10 · Science · Medium
→Adding sodium carbonate to a solution gives no gas, but adding acid to sodium carbonate gives gas. What does this indicate?
Class 10 · Science · Medium
→Why is bleaching powder used for disinfecting drinking water?
Class 10 · Science · Medium
→If a solution has pH close to 14 and feels slippery on skin, what is the safest conclusion?
Class 10 · Science · Medium
→A solution is acidic but very dilute. Around what pH can it be?
Class 10 · Science · Hard
→Which option correctly shows the relationship among gypsum, plaster of Paris, and water?
Class 10 · Science · Medium
→Why is the pH of acid rain lower than that of normal rain?
Class 10 · Science · Medium
→Red litmus turns blue in a solution, and after adding acid both red and blue litmus show no change. What is the nature of the final solution?
Class 10 · Science · Medium
→If a substance forms salt and water with an acid but is insoluble in water, how should it be classified?
Class 10 · Science · Medium
→The gas released on heating baking soda turns lime water milky. What is the identity of the gas?
Class 10 · Science · Medium
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