Which of the following is used for metal...

Which of the following is used for metal cleaning and finshing

`CHCl_2`

`C Cl_4`

`CH_2 Cl_2`

`CHI_3`

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Which of the following is a amphoteric metal

`Zn+CuSO_(4)rarrZnSO_(4)+Cu`

`2Na+2H_(2)Orarr2NaOH+H_(2)`

`TiCl_(4)+2MgrarrTi+2MgCl_(2)`

`3Fe_(3)O_(4)+8Alrarr4Al_(2)O_(3)+9Fe`

`Zn+CuSO_(4) to ZnSO_(4)+Cu`

`2Na+2H_(2)O to 2NaOH+H_(2)`

`TiCl_(4)+2Mg to Ti+2MgCl_(2)`

`3Fe_(3)O_(4)+8Al to 4Al_(2)O_(3)+9Fe`