Which of the following gas mixtures will not obey Dalton's law of partial pressure?

Atmolysis is a process of

$A$ neon-dioxygen mixture contains $70.6 \ g$ dioxygen and $167.5 \ g$ neon. If the total pressure of the mixture of gases in the cylinder is $25 \ bar$,what are the partial pressures of dioxygen and neon in the mixture?

Consider the following statements: For diatomic gases,the ratio $C_p/C_v$ is equal to:
$1$. $1.40$ (lower temperature)
$2$. $1.66$ (moderate temperature)
$3$. $1.29$ (higher temperature)
Which of the above statements are correct?

The total pressure of a mixture of two gases is equal to .......

The ratio of rates of diffusion of gases $X$ and $Y$ of molecular weights $36$ and $64$ is