Which of the following plants is commonly used as green manure?

Three samples of the same gas $A, B$ and $C$ $(\gamma = 3/2)$ initially have equal volume. Now the volume of each sample is doubled. The process is adiabatic for $A$,isobaric for $B$ and isothermal for $C$. If the final pressures are equal for all three samples,the ratio of their initial pressures is:

$A$ rope is used to lower a block of mass $M$ vertically by a distance $x$ with a constant downward acceleration of $\frac{g}{2}$. The work done by the rope on the block is:

Fight-or-flight reactions cause activation of

The chlorination of ethane is an example of which of the following types of reactions?

Which of the following complexes has the highest stability constant at $298 \ K$?