Ionic solids have high melting points and are rather hard. ... Covalent solids comprise two- or three-dimensional networks of atoms held together by covalent bonds; they tend to be very hard and have high melting points
Touch can sense the texture, and you can see what color it is, but if your talking about chemical properties, I'd say smell, color, and heat can identify some chemicals.
I'm not 100% sure on this one, but I think it's C.
Sorry, I'm not really good with Chemistry.
Hope this helps :)
Explanation:
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