Which of the following complexes exhibits both geometrical and optical isomerism?

Two cylinders $A$ and $B$ fitted with pistons contain equal number of moles of an ideal monoatomic gas at $400 ~K$. The piston of $A$ is free to move while that of $B$ is held fixed. Same amount of heat energy is given to the gas in each cylinder. If the rise in temperature of the gas in $A$ is $42 ~K$,the rise in temperature of the gas in $B$ is (in $~K$)

The number of circles that touch all the straight lines $x+y=4$,$x-y=-2$,and $y=2$ is

$A$ fall in glomerular filtration rate $(GFR)$ activates

$\sqrt{10 - \sqrt{24} - \sqrt{40} + \sqrt{60}} = ?$

An athlete completes one round of a circular track of radius $R$ in $40 \ s$. What will be his displacement at the end of $2 \ min \ 20 \ s$?