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Class 10 · Science · Medium
→Why is sodium carbonate solution basic?
Class 10 · Science · Medium
→Aqueous sodium chloride solution shows no change with red or blue indicator paper. What is the reason?
Class 10 · Science · Medium
→Why is it dangerous to add water to a concentrated acid during dilution?
Class 10 · Science · Medium
→Why does an acid not immediately become a base when diluted with a large amount of water?
Class 10 · Science · Medium
→Which change can bring the pH of a basic solution close to 7?
Class 10 · Science · Medium
→The pH of an acidic solution changes from 3 to 6. Which conclusion is correct?
Class 10 · Science · Medium
→Which solution is most likely to have the highest concentration of hydroxide ions?
Class 10 · Science · Medium
→Which metal is least likely to produce hydrogen gas with dilute acid?
Class 10 · Science · Hard
→An unknown solid gives a gas with acid. The gas turns lime water milky and the milkiness disappears on passing excess gas. What is likely present in the solid?
Class 10 · Science · Medium
→In which reaction are salt, water, and carbon dioxide all definitely formed?
Class 10 · Science · Medium
→Which pair will form salt and water but generally no gas?
Class 10 · Science · Hard
→Why does the basicity decrease when carbon dioxide is passed through sodium hydroxide solution?
Class 10 · Science · Medium
→The reaction between calcium oxide and carbon dioxide forms a compound. What nature does this illustrate?
Class 10 · Science · Medium
→Why would it be wrong to call aluminium oxide only a basic oxide?
Class 10 · Science · Hard
→Zinc can give hydrogen gas with both acid and sodium hydroxide. What kind of behaviour does this indicate?
Class 10 · Science · Medium
→In which case is an acidic solution most likely to have the highest electrical conductivity?
Class 10 · Science · Hard
→Two acids have the same concentration. The first has pH 2 and the second has pH 5. Which statement is correct?
Class 10 · Science · Hard
→A student passes dry hydrogen chloride gas separately over dry and moist blue indicator papers. Only the moist paper turns red. Which principle is proved?
Class 10 · Science · Hard
→A colourless solution turns blue indicator paper red but produces no bubbles with carbonate. Which conclusion is most correct?
Class 10 · Science · Easy
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