Which series possesses an inferior ovary?

Which one of the following halogens liberates oxygen,when passed through hot concentrated $KOH$ solution?

The structure of $XeOF_4$ is

$A$ block of mass $m$ is placed on a surface with a vertical cross-section given by $y = \frac{x^3}{6}$. If the coefficient of friction is $0.5$,the maximum height above the ground at which the block can be placed without slipping is

Modern cereal $Triticale$ is developed by crossing between

The ratio of diameters of two wires of the same material is $n : 1$. The length of the wires is $4\, m$ each. On applying the same load,the increase in length of the thin wire will be