Molecular compounds of low molecular weight tend to be gases at room temperature. which of the following is most likely not a gas at room temperature? molecular compounds of low molecular weight tend to be gases at room temperature. which of the following is most likely not a gas at room temperature? nabr co2 hcn n2 nh3

Option (a) is the correct answer.

Explanation:

Sodium bromide (NaBr) is an ionic salt as it is formed by transfer of an electron from sodium to bromine atom.

Whereas , HCN, and are all covalent compounds. And, all of them exists as a gas at room temperature.

Also according to rate of diffusion law, rate of diffusion is inversely proportional to square root of molecular weight of gas.

Mathematically,  Rate of diffusion =

Out of the given options NaBr has the highest molecular weight which is 102.894 g/mol.

Thus, we can conclude that NaBr is most likely not a gas at room temperature.

a electronegativity decreases beacuse the size of nucleus is bigger.