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