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Sample $12:$ What is this sample's hardness?a. harder than glassb. softer than glass but harder than nailc. softer than nail but harder than copperd. softer than copper but harder than a fin-gernaile. softer than a fingernail
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5. - A nail has a hardness of around 2.5. - Copper has a hardness of around 3. - A fingernail has a hardness of around 2. Now, let's analyze the options: Show more…
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