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InterviewSolution
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G HOTS (Higher Order Thinking Skills)1. What do you call the black substance that is present in pencils? Is it a metal or anon-metal? (Hint: Recall the properties of non-metals.)2. Sample A can displace sample B from its salt solution and sample B can displacesample C, but sample C cannot displace samples A and B. Find out the names of thesesamples and arrange them in the decreasing order of their reactivity. (Hint: Samples Aand B are placed below calcium and above hydrogen in the activity series, whereas sample C is the leastreactive metal and is placed between mercury and gold.) |
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Answer» Black substance in the lead pencil is graphite is non metal but contact electricity like those of carbon brush of drills.Graphite is carbon of lead element which handle heat fire and electric contacts,soft like talc and smooth graphite,it is non metal |
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