You are given four boxes; containing four different types of substances. It is seen that the substance in the first one conducts electricity in its aqueous solution, the second conducts it in its native form/solid and the third one doesn’t conduct it at all. The conductivity of the fourth is unknown it is known however that it is radioactive.
If you could open only one, and if it is known that one of these boxes has gold ,which box should you open in order to get the gold?
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