Question

Interpret the information below about four metals A, B, C and D to judge their order of activity.
a) Metal A and metal B react slowly with water.
b) Metal C displaces metal B from an aqueous solution of its chloride salt.
c) Metal D does not react with dilute acids.
d) Metal B does not displace metal A from an aqueous solution of its sulfate salt.

Answer 1

Solution:

1) Because metals A and B react with water, then they place before Mg in reactivity series of metals. Because metal B does not displace metal A from an aqueous solution, then A stays before B in reactivity series of metals

2) Because metal C displaces metal B from an aqueous solution, then C stays before B, then metals order is A, C, B.

3) Because metal D does not react with dilute acids, then D stays after H in reactivity series of metals, then it stays after A, C and B.

Answer: Activity of metals decreases in order A, C, B and D.