The oxidation number of $Pt$ in $[Pt(C_2H_4)Cl_3]^-$ is

Product $(A)$ is

$A$ monoatomic ideal gas,initially at temperature $T_1$,is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature $T_2$ by releasing the piston suddenly. If $L_1$ and $L_2$ are the lengths of the gas column before and after expansion respectively,then $\frac{T_1}{T_2}$ is given by:

The lines represented by the equation $x^2-y^2-x+3y-2=0$ are :

The number of divisors of $7!$ is

The organization of living organisms starts with which level?