Which of the following quantities does not depend upon the orbital radius of the satellite?

The eccentricity of the ellipse $x^2+4y^2+2x+16y+13=0$ is

According to molecular orbital theory,the total number of bonding electron pairs in $O_2$ is

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

If $\frac{x}{(x - 1)(x^2 + 1)^2} = \frac{1}{4}\left[ \frac{1}{(x - 1)} - \frac{x + 1}{x^2 + 1} \right] + y$,then $y =$

Four successive members of the first series of the transition metals are listed below. For which one of them is the standard electrode potential $(E^o_{M^{2+}/M})$ value positive?