C+BSO4 =CSO4+B
A+BSO4= no reaction
CSO4+A=no reaction
The correct order of decreasing reactivity of A,B and C
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C > B > A
A can't replace B in 2 reaction so it is less reactive than B
but C can replace B in reaction 1 so it is more reactive than B
A can't replace B in 2 reaction so it is less reactive than B
but C can replace B in reaction 1 so it is more reactive than B
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