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Class 10 · Science · Medium
→A student adds phenolphthalein to a colourless solution and observes a pink colour. Then dilute hydrochloric acid is added slowly and the pink colour disappears. Which conclusion is most correct?
Class 10 · Science · Medium
→A student added an acidic substance to already acidic soil. What effect is likely on plant growth?
Class 10 · Science · Medium
→Why is it not suitable to leave sodium hydroxide open in air?
Class 10 · Science · Medium
→An unknown sample reacts with acid to give a gas that turns lime water milky. Which class could the sample belong to?
Class 10 · Science · Easy
→A solution turns red litmus blue and phenolphthalein pink. Which could it be?
Class 10 · Science · Easy
→A solution turns blue litmus red but keeps phenolphthalein colourless. What is the nature of the solution?
Class 10 · Science · Easy
→If both magnesium and zinc react with dilute acid, which gas will be common in both reactions?
Class 10 · Science · Easy
→What products are generally formed in the reaction between a metal and an acid?
Class 10 · Science · Medium
→In which reaction can salt, water, and carbon dioxide all be formed?
Class 10 · Science · Medium
→Why can a solution of sodium hydrogen carbonate be applied on a bee sting?
Class 10 · Science · Medium
→Why is baking soda useful for reducing irritation from an ant sting?
Class 10 · Science · Medium
→What is the reason for keeping toothpaste mildly basic?
Class 10 · Science · Medium
→What is the main role of bacteria in tooth decay?
Class 10 · Science · Medium
→If the pH of soil becomes very low, which substance can a farmer add to improve it?
Class 10 · Science · Easy
→Why is red cabbage juice useful as an indicator?
Class 10 · Science · Easy
→Why does a turmeric stain show a reddish-brown color when soap is applied?
Class 10 · Science · Easy
→In which condition will phenolphthalein change from colourless to pink?
Class 10 · Science · Easy
→Which is the correct description of a weak acid?
Class 10 · Science · Hard
→What is the main difference between a concentrated acid and a strong acid?
Class 10 · Science · Medium
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