P,Q and R are 3 elements which undergo chemical reactions according to the following equations:
a. `P_(2)O_(3)+2QtoQ_(2)O_(3)+2P`
(ii) `3RSO_(4)+2Qto(SO_(4))(3)+3B`
c. `3RO+2PtoP_(2)O_(3)+3R`
Answer the following questions:
(i) Which element is least reactive?
(ii) Which element is least reactive?
(iii) State the type of reaction listed above.

Explanation

(i) Most reactive metal is Q as it has displaced both P and R from their compounds.
(ii) Element R is least reactive as it has been replaced by P and Q.
(iii) They are al displacement reactions.