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Class 10 · Science
→A moist gas turns red litmus blue but has no effect on dry litmus. What is the most correct conclusion about the gas?
Class 10 · Science
→While diluting acid, why should acid be added to water instead of adding water to acid?
Class 10 · Science
→Among two acids of equal concentration, one has lower pH and higher conductivity. What type of acid is it likely to be?
Class 10 · Science
→Carbon dioxide first makes lime water milky and then removes the milkiness in excess. Why does this happen?
Class 10 · Science
→A salt solution shows pH 9 and turns red litmus blue. From which type of acid and base could it be formed?
Class 10 · Science
→One solution has pH 1 and another has pH 4. How much greater is the hydrogen ion concentration in the first solution?
Class 10 · Science
→In an acidic solution, zinc first releases a gas and then limestone releases another gas. What is the correct identification of both gases?
Class 10 · Science
→A question asks to identify an acid or base only by taste. What is the correct exam-based response?
Class 10 · Science
→If a solution has pH 11 and phenolphthalein is pink, what will decrease first when acid is added?
Class 10 · Science
→A substance's aqueous solution has excess hydrogen ions. What will happen to blue litmus?
Class 10 · Science
→Why can acid rain water be more corrosive than normal water?
Class 10 · Science
→If washing soda is added to hard water, what is the main benefit of insoluble substance formation?
Class 10 · Science
→If acid is slowly added to a basic solution, what change is expected near neutralisation?
Class 10 · Science
→A student says all bases dissolve in water. Which statement is the correct correction?
Class 10 · Science
→Which gas is passed over dry slaked lime in the manufacture of bleaching powder?
Class 10 · Science
→A soil has pH 4.5. Which treatment is more scientific?
Class 10 · Science
→In an experiment an acidic gas does not affect dry litmus. What is the exam-based reason?
Class 10 · Science
→On adding acid to a solution, the pink colour of phenolphthalein disappears. What was the initial nature of the solution?
Class 10 · Science
→A gas evolves when carbonate is added to an acidic solution. If the gas turns lime water milky, which gas is it?
Class 10 · Science
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