$EAN$ of complex $[Fe(C_2O_4)_3]^{3-}$ is

During the change of $O_2$ to $O_2^-$,the incoming electron goes to the orbital

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

If $x$ is small,so that $x^2$ and higher powers can be neglected,then the approximate value for $\frac{(1-2 x)^{-1}(1-3 x)^{-2}}{(1-4 x)^{-3}}$ is

How many nodal tissues (specialized cardiac musculature) are present in the human heart?

If $\sin ^{-1}\left(\frac{x}{13}\right)+\operatorname{cosec}^{-1}\left(\frac{13}{12}\right)=\frac{\pi}{2}$,then the value of $x$ is