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Class 10 · Science
→Red litmus turns blue in a solution. Acid is added gradually, and finally both litmus papers show no change. What is the final state?
Class 10 · Science
→Why is it proper to protect bleaching powder from moisture and open air?
Class 10 · Science
→Plant roots are not growing well in highly acidic soil. Which substance will be useful in a suitable amount?
Class 10 · Science
→Washing soda helps remove which ions from hard water?
Class 10 · Science
→If a solution of pH 2 is compared with a solution of pH 5, how much more acidic is the first solution?
Class 10 · Science
→A sample is heated, gas is released, and the solution of the remaining solid is basic. If the sample was baking soda, what is the remaining solid?
Class 10 · Science
→What is the main chemical reason for the effect of acid rain on marble?
Class 10 · Science
→A student says sodium chloride is neutral, so its solution will not have ions. Why is this wrong?
Class 10 · Science
→If a solution can damage tooth enamel, in which pH range is it more likely to be?
Class 10 · Science
→A substance gives carbon dioxide with acid and forms a basic solution in water. Which substance is most suitable?
Class 10 · Science
→Why can sodium hydroxide pellets become wet and then less pure in open air?
Class 10 · Science
→Phenolphthalein is colourless and methyl orange is red in a solution. What is the nature of this solution?
Class 10 · Science
→Gypsum forms plaster of Paris on controlled heating. Why is excessive heating a problem?
Class 10 · Science
→By which test can the gas formed at the cathode in the chlor-alkali process be identified?
Class 10 · Science
→A gas turns moist blue litmus red but has no effect on dry blue litmus. What does this prove?
Class 10 · Science
→Which is the safe method for mixing acid with water?
Class 10 · Science
→If an acid is less electrically conducting than another acid of the same concentration, what is the most appropriate conclusion?
Class 10 · Science
→An acid is added to a white solid and a gas evolves that turns lime water milky. Excess of the same gas removes the milkiness. What is the final soluble substance?
Class 10 · Science
→An unknown salt solution shows pH 8.5 and turns red litmus blue. What type of salt is it most likely to be?
Class 10 · Science
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