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Question
Out of three metals P, Q and R, P is less reactive than Q and R is more reactive than P and Q both. Suggest an activity to arragne P, Q and R in order of their decreasing reactivity.
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Solution
Step-1 : Salt solutions of metal P,Q and R were taken
Step-2 : Since, according to question P < Q < R
Since R is more reactive than Q and P so displacement reaction will take place.
(I) R + salt of Q → salts of R + Q
(s) (aq) (aq) (s)
R + salt of P → salts of R + P
(s) (aq) (aq) (s)
(II) Q + salt of R → No reaction
(s) (aq)
Q + salt of P→ salts of Q + P
(s) (aq) (aq) (s)
(III) P + salt of R → No reaction
(s) (aq)
P + salt of Q → No reaction
(s) (aq)
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