Search questions
Choose which content to search, then combine terms with AND or OR.
Class 9 · General Knowledge · Easy
→What is the main benefit of keeping a study place organised?
Class 10 · Science · Medium
→A student says acids only turn blue litmus red and show no other chemical property. Which response is correct?
Class 10 · Science · Hard
→A sample gives a gas that turns lime water milky. On passing excess gas, the milkiness disappears. Which two calcium compounds form in order?
Class 10 · Science · Medium
→If a salt is formed by mixing an acid and a base, when is its aqueous nature most likely to be neutral?
Class 10 · Science · Medium
→What is the correct scientific reason for avoiding storage of curd in copper or brass vessels?
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
→