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Class 10 · Science · Medium
→Blue copper sulphate gives a white substance on heating. Its colour returns when water is added. What does this prove?
Class 10 · Science · Medium
→A student says a concentrated acid and a strong acid are the same. What is the correct evaluation?
Class 10 · Science · Hard
→Which statement about bleaching powder is most correct?
Class 10 · Science · Hard
→If equal amounts of water are repeatedly added to an acidic solution, what change is expected?
Class 10 · Science · Hard
→Which option correctly gives an example of a strong acid and a weak acid?
Class 10 · Science · Hard
→Which is the correct group of three main products formed in the chlor-alkali process?
Class 10 · Science · Hard
→Plaster of Paris loses its usefulness when kept open for a long time. What is the best reason?
Class 10 · Science · Hard
→Washing soda crystals become powdery when kept in open air. Which phenomenon does this illustrate?
Class 10 · Science · Hard
→A metal does not give hydrogen gas with an acid, but zinc gives gas in the same acid. Which conclusion is correct?
Class 10 · Science · Hard
→Which salt is most likely to give an acidic solution when dissolved in water?
Class 10 · Science · Hard
→A gas released from a carbonate sample with acid is passed into lime water for a long time. Why can the final solution become clear again?
Class 10 · Science · Hard
→What is the main reason for the different effect of dry hydrogen chloride and moist hydrogen chloride on litmus?
Class 10 · Science · Medium
→If the pH of a solution is brought from 11 close to 7, which ion is being effectively reduced?
Class 10 · Science · Medium
→A solution gives green colour with universal indicator. When a small amount of acid is added, the colour becomes yellow. What does this show?
Class 10 · Science · Medium
→Of two colourless solutions, the first gives a gas with magnesium and the second turns red litmus blue. What is the correct identification?
Class 10 · Science · Medium
→If a student says acids are always dangerous and bases are always safe, what is the correct response?
Class 10 · Science · Medium
→Which statement correctly differentiates the uses of baking soda and washing soda?
Class 10 · Science · Medium
→In an experiment, dry litmus is unaffected, but the same gas changes moist litmus colour. What is the best conclusion?
Class 10 · Science · Medium
→A little base is added to an acidic solution, so pH increases but complete neutralisation does not occur. Why?
Class 10 · Science · Medium
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