Amongst the following the metals which can be refined by vapour phase refining are :
Zn, Cu, Ti, Ni, Co, Al, Zr

Explanation

To determine which metals among Zn, Cu, Ti, Ni, Co, Al, and Zr can be refined by vapor phase refining, we need to understand the process of vapor phase refining and the properties of these metals.

### Step-by-Step Solution:

1. **Understanding Vapor Phase Refining**:
Vapor phase refining is a method used to purify certain metals by converting them into their gaseous form and then back into solid form. This process is particularly effective for metals that form volatile compounds.

2. **Identifying the Metals**:
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