Which among the following factors is the most important in making fluorine the strongest oxidising halogen?

For a binomial variate $X$,if $n=4$ and $P(X=4)=6 P(X=2)$,then the value of $p$ is

The Biuret test is not given by:

What effect does branching of an alkane chain have on its boiling point?

The covalent alkaline earth metal halide $(X = Cl, Br, I)$ is

When a non-volatile solute is added to a solvent,the vapor pressure of the solvent decreases by $10 \ mm \ Hg$. The mole fraction of the solute in the solution is $0.2$. If the vapor pressure is to be decreased by $20 \ mm \ Hg$,what will be the mole fraction of the solvent?