1.

Pickout:compound+ elementtocompoundtypeof combinationreaction

Answer»

`PCl_(5)toPCI_3 +Cl_2`
`Mg+O_2 to 2MgO`
`PCI_3 Cl_2 toPCl_(5)`
`2Na+Cl_(2) to2NaCl`

ANSWER :C


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