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Class 10 · Science · Medium
→Washing soda crystals become powdery when kept in open air. This is related to which phenomenon?
Class 10 · Science · Medium
→Why does hydrochloric acid have a lower pH than ethanoic acid at the same concentration?
Class 10 · Science · Medium
→A gas first turns lime water milky and removes the milkiness when passed in excess. Which soluble substance forms in excess?
Class 10 · Science · Medium
→A salt solution turns blue litmus red. From which type of acid and base is it most likely formed?
Class 10 · Science · Hard
→A solution has pH 3. If the hydrogen-ion concentration becomes one hundred times lower, what will be the approximate new pH?
Class 10 · Science · Hard
→An unknown solution turns blue litmus red and gives a gas with zinc. When sodium carbonate is added to the same solution, another gas is released. What is the correct identification of both gases?
Class 10 · Science · Easy
→A question suggests using only taste to identify acids, bases, and salts. What is the most correct response from an exam point of view?
Class 10 · Science · Easy
→An indicator shows red in acidic solution and yellow in basic solution. Which indicator could it be?
Class 10 · Science · Medium
→A student says carbon dioxide is only a gas, so it has no relation with acids and bases. What is the correct correction?
Class 10 · Science · Medium
→Universal indicator gives blue colour in a solution. After adding acid, the colour becomes green. What does this mean?
Class 10 · Science · Hard
→A salt formed by an acid-base reaction gives an acidic solution. What does this indicate about the parent substances?
Class 10 · Science · Medium
→An aqueous solution of a substance shows pH 13. Why is it unsafe to touch it directly?
Class 10 · Science · Medium
→If blue litmus turns red in a solution and bubbles form when carbonate is added, which conclusion is correct?
Class 10 · Science · Medium
→Which pair is not correct?
Class 10 · Science · Hard
→If adding water to an acidic solution changes its pH from 2 to 3, what happens to acidity?
Class 10 · Science · Medium
→What risk may occur when curd is stored in a copper vessel?
Class 10 · Science · Medium
→Why does pH increase when hydroxide ions are added to an acidic solution?
Class 10 · Science · Medium
→A student says every salt solution is neutral. Which example will disprove this statement?
Class 10 · Science · Medium
→Carbon dioxide is passed into a solution. Milkiness appears first and then disappears. Which substance causes the initial milkiness?
Class 10 · Science · Medium
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