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Class 10 · Science · Hard
→Why can ammonium chloride solution be acidic and sodium carbonate solution be basic?
Class 10 · Science · Medium
→If a solution changes from pH 4 to pH 7, what happens to hydrogen ion concentration?
Class 10 · Science · Medium
→What chemical risk is there in storing sour substances in a brass vessel?
Class 10 · Science · Medium
→Metal oxides form salt and water with acids. This is an example of which broader rule?
Class 10 · Science · Medium
→The aqueous solution of a non-metal oxide turns blue litmus red. How can it react with a base?
Class 10 · Science · Medium
→A salt solution shows both pH 7 and electrical conductivity. What type of salt can it be?
Class 10 · Science · Hard
→Why is it safer to add acid slowly into water while diluting acid?
Class 10 · Science · Hard
→What is the correct pair of the gas formed at the cathode and the base remaining in solution in the chlor-alkali process?
Class 10 · Science · Medium
→Sodium chloride solution has pH near 7. Still it conducts electricity. What does this prove?
Class 10 · Science · Medium
→Methyl orange is red in a solution. On adding base, its colour becomes yellow. What is the conclusion?
Class 10 · Science · Medium
→A substance forms salt and water with an acid but does not dissolve in water. What is it?
Class 10 · Science · Medium
→Magnesium gives a gas in an acidic solution, but calcium carbonate gives a different gas in the same solution. Which pair is correct?
Class 10 · Science · Medium
→How does basic toothpaste help prevent tooth decay?
Class 10 · Science · Medium
→A small amount of base is added to an acidic solution and pH changes from 3 to 5. How much did the acidity change approximately?
Class 10 · Science · Medium
→Why does acid rain slowly corrode a marble statue?
Class 10 · Science · Medium
→A solution has pH 7 and conducts electricity. Which solution could it be?
Class 10 · Science · Medium
→If a gas turns moist red litmus blue but has no effect on dry red litmus, what is the conclusion about the gas?
Class 10 · Science · Hard
→Why can the bleaching property of bleaching powder decrease when it is kept in a moist open place?
Class 10 · Science · Medium
→Why does pH increase when hydroxide ions are added to an acidic solution?
Class 10 · Science · Medium
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