State which of the following chemical reactions will take place or not, giving suitable reason for each : (a) {\Zn}_{( { s})}+ {\CuSO}_{4( {\aq})} \to {\ZnSO}_{4( {\aq})}+ {\Cu}_{( { s})} (b) {\Fe}_{( { s})}+ {\ZnSO}_{4( {\aq})} \to {\FeSO}_{4( {\aq})}+ {\Zn}_{( { s})} (c) {\Zn}_{( { s})}+ {\FeSO}_{4( {\aq})} \to {\ZnSO}_{4( {\aq})}+ {\Fe}_{\text{(s) }}

CBSE Class 10 Science 2016 Term 1 Paper - Question 10

Question : 10 of 36

Marks: +1, -0

State which of the following chemical reactions will take place or not, giving suitable reason for each :
(a)

{\Zn}_{( {\ s})}+ {\CuSO}_{4( {\aq})} → {\ZnSO}_{4( {\aq})}+ {\Cu}_{( {\ s})}

(b)

{\Fe}_{( {\ s})}+ {\ZnSO}_{4( {\aq})} → {\FeSO}_{4( {\aq})}+ {\Zn}_{( {\ s})}

(c)

{\Zn}_{( {\ s})}+ {\FeSO}_{4( {\aq})} → {\ZnSO}_{4( {\aq})}+ {\Fe}_{\;\text "(s) "\;}

Solution:

(b)

{\Fe}_{( {\ s})}+ {\ZnSO}_{4( {\aq})} → {\FeSO}_{4( {\aq})}+ {\Zn}_{( {\ s})}

is not possible, because

{\Zn}

is more reactive than

{\Fe}

so it cannot be replaced.

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