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Class 10 · Science · Medium
→An aqueous salt solution shows pH 5. What is the most probable formation condition of this salt?
Class 10 · Science · Medium
→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 · Hard
→If the pH of a solution changes from 2 to 5, what happens to the hydrogen ion concentration?
Class 10 · Science · Hard
→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 · Medium
→A universal indicator gives deep red colour in one solution and violet colour in another solution. Which comparison is correct?
Class 10 · Science · Easy
→If a student says acids should be identified only by taste, why is this method wrong?
Class 10 · Science · Medium
→A substance does not dissolve in water but reacts with acid to form salt and water. What can it be called?
Class 10 · Science · Medium
→A gas turns moist blue litmus red. What does this indicate about the gas?
Class 10 · Science · Medium
→In a solution both red and blue litmus do not change colour. What is the most appropriate conclusion?
Class 10 · Science · Medium
→Which substance is considered useful for reducing permanent hardness of water?
Class 10 · Science · Medium
→Which is the most suitable sequence to confirm the presence of carbonate ions in a sample?
Class 10 · Science · Medium
→If baking soda is heated, what will be the main substance in the solid residue?
Class 10 · Science · Medium
→Which statement about the nature of salts is incorrect?
Class 10 · Science · Medium
→When acid is added to a solution, its pH goes below 7. Which ion has become relatively more abundant?
Class 10 · Science · Medium
→If a small amount of acid falls on the skin, what should be the first safe step in the laboratory?
Class 10 · Science · Easy
→Which pair is a correct daily-life example of neutralisation?
Class 10 · Science · Medium
→If a substance gives hydroxide ions in water, what effect will its solution show on an indicator?
Class 10 · Science · Medium
→Why is care needed while mixing a strong base with water?
Class 10 · Science · Medium
→When acid and base are added dropwise separately to a solution, its pH changes each time. What does this show?
Class 10 · Science · Medium
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