8) which substance(s) will be good conductors of electricity? i. h2o (s) ii. nacl (s) iii. nacl (l) iv. au (s) a) i and ii only b) iii and iv only c) ii and iii d) all of them

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We know that, acids and strong bases are good conductors of electricity!. And gold conducts electricity , while the best is silver and niext comes gold!. And H20 which is water contains less ions , so it is not a good conductors , it is a conductors but not a good conductor!. Salt in it's solid for cannot produce ions, hence, it cannot conduct electricity , but when this salt is mixed with water or when it is in it's molten state it can conduct electricity!. So now,the answer for the question is ,

B) III and IV only!.

Hope my answer helps!

The objects are acted upon by only one force. gravity. mass times the acceleration of gravity (-9.81meters/second squared).

Because its reliable.   there is no pollution  the chances of a radiation leak is low