HELP!
Which of the following substances
CaCl2, FeCl2, Hg, H20, CrCl3, MgO, Na, Cu
i) Conducts electricity in (s) state?
ii)is used as a refractory material in furnaces?

Question

HELP!
Which of the following substances
CaCl2, FeCl2, Hg, H20, CrCl3, MgO, Na, Cu
i) Conducts electricity in (s) state?
ii)is used as a refractory material in furnaces?

aravindg · Answer

1) wil be Na,Cu ...These are metals

aravindg · Answer

2) I think it is CaCl2

aravindg · Answer

Hg also conducts electricity in s state

xanthe · Answer

Can CaCl2,CrCl3,MgO be under i)?

aravindg · Answer

nope

xanthe · Answer

Why?

aravindg · Answer

those are salts

aravindg · Answer

they conduct electricity only in molten state

xanthe · Answer

Ohh..Ok tysm!:D

xanthe · Answer

But isnt Hg a liquid?

thomaster · Answer

yes mercury is liquid at room temperature and a good conductor in liquid, solid and gas state.

thomaster · Answer

by the way for the second point i'd pick magnesium oxide ($MgO$). it has a melting point of 3125 K which is 3 times higher than the melting point of Calciumchloride($CaCl_2$)

xanthe · Answer

You guys r too kind. Thank you so much!:D