The correct statement is/are:

Options

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

Answer

A, B, D

Explanation

Since `delta gt delta'`, hence C-atom in `CF_(4)` is more electronegative than in `C Cl_(4)`.