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Class 10 · Science
→Which statement correctly explains the difference between a strong acid and a concentrated acid?
Class 10 · Science
→Tooth decay starts rapidly when the pH falls below which value?
Class 10 · Science
→A solution turns red litmus blue. On adding acid, heat is released and a salt is formed. What type of reaction is this?
Class 10 · Science
→Why should curd and sour substances not be kept in brass or copper vessels?
Class 10 · Science
→How does an antacid give relief during excess acidity in the human stomach?
Class 10 · Science
→Why do farmers add slaked lime to soil when its pH is too low?
Class 10 · Science
→Methyl orange turns red in a solution and phenolphthalein remains colourless. What is the nature of the solution?
Class 10 · Science
→Why is plaster of Paris kept away from moisture in a closed container?
Class 10 · Science
→Blue copper sulphate crystals turn white on heating. This change occurs due to removal of what?
Class 10 · Science
→In the chlor-alkali process, what is formed at the cathode during electrolysis of concentrated sodium chloride solution?
Class 10 · Science
→In the manufacture of bleaching powder, chlorine gas reacts with which substance?
Class 10 · Science
→Which statement is correct when an acidic solution is diluted with water?
Class 10 · Science
→Phenolphthalein turns pink in sodium hydroxide solution. The colour disappears when acid is added slowly. What is the reason?
Class 10 · Science
→Which substance is scientifically suitable to reduce the pain caused by a bee sting?
Class 10 · Science
→What main products are formed when both metal carbonates and metal hydrogen carbonates react with acids?
Class 10 · Science
→Among hydrochloric acid and ethanoic acid of equal concentration, which acid shows higher electrical conductivity and why?
Class 10 · Science
→Which of the following pairs is correctly matched?
Class 10 · Science
→If a salt is formed from a strong acid and a weak base, how will its aqueous solution generally be?
Class 10 · Science
→A student added dilute acid to sodium carbonate and passed the gas into lime water. Milkiness appeared first and then disappeared on passing excess gas. What is the correct reason?
Class 10 · Science
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