1.

The correct statement is/are:

Answer»

Zirconium (Zr) and hafnium (HF) have almost same size
Correct ORDER of ionisation energy of coinage metals is CugtAg`ltAu`
Carbon atom in `C Cl_(4)` is more electronegative than carbon atom in `CF_(4)`
`PB^(2+)` is more stable than `Pb^(4+)`

Solution :
Since `delta GT delta.`, hence C-atom in `CF_(4)` is more electronegative than in `C Cl_(4)`.


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