Explain the following term with an example: Tridentate ligands.

$A$ gaseous mixture consists of $16 \, g$ of helium and $16 \, g$ of oxygen. The ratio $(C_p / C_v)$ of the mixture is

The solution of $\frac{dy}{dx} + 1 = e^{x+y}$ is

The structure of $PCC$ is

At a certain place,a magnet makes $30$ oscillations per minute. At another place where the magnetic field is double,its time period will be:

Match the following (Take the relative strength of the strongest fundamental forces in nature as $1$):
| List-$I$ (Fundamental forces in nature) | List-$II$ (Relative strength) |
| :--- | :--- |
| $(A)$ Strong nuclear force | $(e)$ $10^{-2}$ |
| $(B)$ Weak nuclear force | $(f)$ $1$ |
| $(C)$ Electromagnetic force | $(g)$ $10^{10}$ |
| $(D)$ Gravitational force | $(h)$ $10^{-13}$ |
| | $(i)$ $10^{-39}$ |
The correct match is: