Question

Heating a certain pure solid completely decomposes it into a solid and a gas, each of which is also a pure substance. Which of the following is/are reasonable conclusions regarding these observations?
1) The solid is a compound and the gas is an element.
2) At least one of the products is an element.
3) The original solid is not an element.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1, 2, and 3

Answer

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