Molecular compounds are those with covalent bonds between the elements and those elements are typically non metals.
Here in the given options, Ar is an element. NaI has an ionic bond. Hence, N2O4 has a covalent bond between the two non metals and is a molecular compound.
Packet filter is a standard router equipped with some extra functionality. The extra functionality allows every incoming or outgoing packet to be inspected. Packets meeting some criterion are forwarded normally. Those that fail the test are dropped
Lying between the states of pennsylvania and Maryland, which imaginary line divided the 'Slave States' from the 'Free States' in pre-Civil war America?