Two substances \[P\] and \[Q\] when brought together, form substance \[R\] with the evolution of heat. The properties of \[R\] are different from both \[P\] and\[Q\]. What is substance\[R\]?

Two substances \[P\] and \[Q\] when brought together, form substance \

1.	Two substances \[P\] and \[Q\] when brought together, form substance \[R\] with the evolution of heat. The properties of \[R\] are different from both \[P\] and\[Q\]. What is substance\[R\]?
A.	A compound
B.	An element
C.	A metal
D.	A mixture
Answer» B. An element

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Two substances \[P\] and \[Q\] when brought together, form substance \[R\] with the evolution of heat. The properties of \[R\] are different from both \[P\] and\[Q\]. What is substance\[R\]?

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