MediumChemistryEMF of cell
+4 / -1
Red hot carbon will remove oxygen from the oxides XO and YO but not from ZO. Y will remove oxygen from XO. Use this evidence to deduce the order of activity of the three metals X, Y and Z, putting the most reactive first-
A
X, Y, Z
B
Z, Y, X
C
Y, X, Z
D
Z, X, Y
Explanation
Carbon reduces XO and YO ⇒ X and Y are less reactive than carbon. Carbon cannot reduce ZO ⇒ Z is more reactive than carbon. Y removes oxygen from XO ⇒ Y is more reactive than X. Therefore: Z > Y > X
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