Acidity of diprotic acids in aqueous solutions increases in the order

$300 \, g$ of water at $25^{\circ} C$ is added to $100 \, g$ of ice at $0^{\circ} C$. The final temperature of the mixture is ........... $^{\circ} C$.

Which has the maximum number of molecules among the following?

$\Delta \lambda$ is the difference between the wavelength of the $K_{\alpha}$ line and the minimum wavelength of the continuous $X$-ray spectrum when the $X$-ray tube is operated at a voltage $V$. If the operating voltage is changed to $V/3$,then the above difference is $\Delta \lambda^{\prime}$. Then:

In a rectangle $ABCD$ where $BC = 2AB$,the moment of inertia will be minimum about which axis?

Which statement is incorrect regarding predators?