The anode mud in the electrolytic refining of silver contains

$A$ body of mass $6 ~kg$ is under a force which causes displacement in it given by $s = \frac{t^2}{4}$ metres,where $t$ is time. The work done by the force in $2$ seconds is: (in $~J$)

The joint equation of the lines passing through the origin and trisecting the first quadrant is . . . . . .

The integral $\int \frac{3x^{13} + 2x^{11}}{(2x^4 + 3x^2 + 1)^4} dx$ is equal to (where $C$ is a constant of integration)

Solvay process is used in the manufacture of

$Zn$ and $Cd$ metals do not show variable valency because