Which of the following bonds has the highest energy?

The function $f(x) = x e^{-x}, \forall x \in R$ attains a maximum value at $x$ equal to

During the depression in freezing point experiment,an equilibrium is established between the molecules of

$4 \ g$ of an ideal gas occupies $5.6035 \ L$ of volume at $546 \ K$ and $2 \ atm$ pressure. What is its molecular weight?

The image of the point $(3, 2, 1)$ in the plane $2x - y + 3z = 7$ is

$A$ cylindrical metallic rod,in thermal contact with two heat reservoirs at its two ends,conducts an amount of heat $Q$ in time $t$. The metallic rod is melted and the material is formed into a rod of half the radius of the original rod. The amount of heat conducted by the new rod,when placed in thermal contact with the same two reservoirs in time $t$,is: