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[OLD]Three riddles


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What is special about the ORDER of the numbers below?

8 5 4 9 1 7 6 10 3 2 0



You have nine coins. One of the nine is counterfeit. The counterfeit coin can only be distinguished by weight---it is heavier than the rest. Using a balance scale only twice, find the counterfeit coin.



1. It can cause excessive sweating and vomiting.

2. It is a major component in acid rain.

3. It can cause severe burns in its gaseous state.

4. Accidental inhalation can kill you.

5. It contributes to erosion.

6. It decreases effectiveness of automobile brakes.

7. It has been found in tumors of terminal cancer patients.

A dangerous compound. What is it?

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