When the margins of sepals or petals overlap one another without any particular direction,the condition is termed as

Among $TiF_6^{2-}, CoF_6^{3-}, Cu_2Cl_2$ and $NiCl_4^{2-}$,the colourless species are:

The number of solutions for $z^3+\bar{z}=0$ is

Select the correct option with respect to the age pyramids shown in the image.

In a quadrilateral $ABCD$,the point $P$ divides $DC$ in the ratio $1:2$ and $Q$ is the midpoint of $AC$. If $\overrightarrow{AB}+2\overrightarrow{AD}+\overrightarrow{BC}-2\overrightarrow{DC}=k\overrightarrow{PQ}$,then $k$ is equal to

Electric field at a point varies as $r^0$ for