An unkown substance has a melting point of 1455 degree C, is insoluble in water,

Question

An unkown substance has a melting point of 1455 degree C, is insoluble in water, conducts electricity as a solid, and is hard. Given these properties, which of the following are possible identities for the unknown substance? Check all that apply. Cl_2 Ni Sio_2 KBr An unknown substance has a melting point of 714 degree C is soluble water, does not conduct heat as a solid, and is hard Given these properties which of the following are possible identities for the unknown substance? Check all that apply CO_2 C_diamond Na Mgcl_2

Explanation / Answer

B.

Ni is a metal . It has high melting point and good conductor. It is insoluble in water

Ni

C. MgCl2 is ionic compounf. It is solubel in water. It has high melting point.

It is bd conductor in solid but good conductor in aquoeus.

MgCl2

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