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Class 10 · Science
→If soil has very low pH and too much lime is added, what problem may occur?
Class 10 · Science
→What is the major risk of storing sodium hydroxide in an acid bottle?
Class 10 · Science
→Why may washing soda crystals gradually appear like a white powder when left exposed to air?
Class 10 · Science
→If an acid solution has very little water, why may its electrical conductivity appear low?
Class 10 · Science
→Why do acidic properties become clear when hydrogen chloride gas dissolves in water?
Class 10 · Science
→Methyl orange turns yellow and phenolphthalein turns pink in a solution. What is the nature of the solution?
Class 10 · Science
→Why can prolonged strong heating of gypsum form more anhydrous calcium sulphate instead of plaster of Paris?
Class 10 · Science
→A non-metal oxide dissolves in water and forms a solution that turns blue litmus red. What type of oxide is it?
Class 10 · Science
→If a metal oxide reacts with an acid to form salt and water, what general nature of the metal oxide is proved?
Class 10 · Science
→In the chlor-alkali process, where is the sodium hydroxide mainly obtained?
Class 10 · Science
→Acid is slowly added to a basic solution. The pink colour of phenolphthalein finally disappears. What point can this indicate?
Class 10 · Science
→An aqueous salt solution shows pH 5. What is the most probable formation condition of this salt?
Class 10 · Science
→A white powder reacts with dilute acid to release a gas. The gas turns lime water milky, and excess gas reduces the milkiness. Which group can the white powder belong to?
Class 10 · Science
→If the pH of a solution changes from 2 to 5, what happens to the hydrogen ion concentration?
Class 10 · Science
→Two acids have the same concentration. The first acid is a good conductor of electricity and the second is a weak conductor. What is the best reason?
Class 10 · Science
→A universal indicator gives deep red colour in one solution and violet colour in another solution. Which comparison is correct?
Class 10 · Science
→If a student says acids should be identified only by taste, why is this method wrong?
Class 10 · Science
→A substance does not dissolve in water but reacts with acid to form salt and water. What can it be called?
Class 10 · Science
→A gas turns moist blue litmus red. What does this indicate about the gas?
Class 10 · Science
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