For a gas, RCV= 0. ,67, the gas is made upof molecules which are:(a) Diatomic(b) Mixture of diatomic and polyatomicmolecules(c) Monoatomic(d) Polyatomic

The value of RCV (Ratio of specific heats, Cp/Cv) gives us information about the type of gas we are dealing with.

For monoatomic gases (like helium, neon etc.), this ratio is approximately 5/3 = 1.67.

For diatomic gases (like nitrogen, oxygen etc.) or polyatomic gases (like carbon dioxide, sulfur hexafluoride etc.), this ratio is approximately 7/5 = 1.4.

Given that RCV = 0.67, none of the options (a) Diatomic, (b) Mixture of diatomic and polyatomic molecules, (c) Monoatomic, (d) Polyatomic match this value.

There seems to be a mistake in the question or the provided value of RCV. The value of RCV should be greater than 1 for it to correspond to any known type of gas.