The human body does not produce

Two electrons occupying the same orbital are distinguished by

The specific conductance of a $0.1 \ N \ KCl$ solution at $23 \ ^oC$ is $0.012 \ \Omega^{-1} \ cm^{-1}$. The resistance of the cell containing the solution at the same temperature was found to be $55 \ \Omega$. The cell constant will be ............. $cm^{-1}$.

Seven white balls and three black balls are randomly arranged in a row. The probability that no two black balls are placed adjacently is

The strength of an acid depends on its tendency to