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How many of the following reactions cann...

How many of the following reactions cannot occur?
`(1) Fe+2HClrarrFeCl_(2)+H_(2) uarr`
`(2) Cu+2HClrarr CuCl_(2)+H_(2)uarr`
`(3) Cu+ZnSO_(4)rarrCuSO_(4)rarrCuSO_(4)+Zndarr`
`(4) Zn+2AgNO_(3)rarrZn(NO_(3))_(2)+2Agdarr`
`(5) Cu+2AgNO_(3)rarrCu(NO_(3))_(2)+2Agdarr`
`(6) Fe+CuSO_(4)rarrFeSO_(4)+Cudarr`

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Verified by Experts

The correct Answer is:
2
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