`CuSO_(4)+XtoXSO_(4)+Cu,CuSO_(4)+YtoYSO_(4)+Cu,`
`XSO_(4)+YtoNo` reaction , `CuSO_(4)+ZtoNo` reaction,
Arrange Cu , X, Y and Z in the ascending order of reactivity.

Options

A. X, Y, Z, Cu
B. Cu , Y , X , Z
C. Cu , X, Z, Y
D. Z , Cu , Y , X

Answer

4

Explanation

`CuSO_(4)+XtoXSO_(4)+Cu`
`:.X` is more reactive than Cu
`CuSO_(4)+YtoYSO_(4)+Cu`
`:. Y` is more reactive than Cu
`XSO_(4)+Yto` No reaction
`:.X` is more reactive than Y
`CuSO_(4)+Zto` No reaction
`:.Z` is less reactive than Cu
`:.` order is `ZltCu ltYltX`