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Class 10 · Science · Easy
→A substance that feels soapy and slippery is generally of which type?
Class 10 · Science · Easy
→A substance with a sour taste is generally of which type?
Class 10 · Science · Easy
→Bases change red litmus paper into which colour?
Class 10 · Science · Easy
→Acids change blue litmus paper into which colour?
Class 10 · Science · Medium
→A clean iron nail is placed in blue copper sulphate solution. A reddish-brown coating forms and the solution turns light green. Which conclusion is correct?
Class 10 · Science · Medium
→A student placed an iron nail in blue copper sulphate solution. The solution gradually turned green and a reddish-brown coating appeared on the nail. Which statement is correct?
Class 10 · Science · Easy
→If heat is written on the product side and the container is hot, what is the nature of the reaction?
Class 10 · Science · Medium
→If a container becomes cold and gas evolves in a reaction, what is the most careful conclusion?
Class 10 · Science · Expert
→Which process do antioxidants slow down in food?
Class 10 · Science · Easy
→Why is rancidity slower in nitrogen-filled food packets?
Class 10 · Science · Medium
→Which of the following reactions is both a displacement reaction and an oxidation-reduction reaction?
Class 10 · Science · Medium
→Rancidity of oils and fats is the result of which chemical process?
Class 10 · Science · Medium
→What is the chemical reason why an oiled iron object rusts less?
Class 10 · Science · Expert
→How does the zinc layer protect iron in galvanisation?
Class 10 · Science · Medium
→Why can rusting start when the paint layer on iron gets scratched?
Class 10 · Science · Medium
→Why are both oxygen and moisture considered necessary for rusting of iron?
Class 10 · Science · Medium
→Why do oxidation and reduction occur together in a redox reaction?
Class 10 · Science · Expert
→If substance A loses oxygen and substance B loses hydrogen which processes occur respectively?
Class 10 · Science · Medium
→Why is hydrogen called oxidised in the reaction between copper oxide and hydrogen?
Class 10 · Science · Medium
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