Answer:
Radiocarbon dating can be used to determine the age of a sample less than 50,000 years old - C
The Lewis acids are electron pair acceptors due to the availability of vacant orbitals they accept electrons from the donor compounds.
Hence, and are Lewis acids.
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in these options not any Element are liquid at 1000k i think you type wrong in first option It is Hg not Ag and Hg is liquid at 1000 k