1.

Which of the following has highest ionisation energy ? (a) Cu (b) Au (c) Ag (d) All have equal ionisation energies

Answer»

Correct option (b) Au

Explanation:

The ionisation potential of Cu, Ag and Au are 7.7 eV, 7.5 eV and 9.2 eV. So Au (gold) has highest ionisation potential.



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