Question

Sample A can displace sample B from its salt solution and sample B can displace sample C but Sample C cannot displace sample A and B. Arrange these three sample in the decreasing order of their reactivity .​

Answer 1

A can displace B but cannot be displaced by C
B can be displaced by A and can displace c
C cannot displace A or B and can be displaced by B

So,
In decreasing order
C A/B