Which of the following is considered a hotspot of biodiversity in India?

The minimum force required to start pushing a body up a rough (having coefficient of friction $\mu$) inclined plane is $F_1$,while the minimum force needed to prevent it from sliding down is $F_2$. If the inclined plane makes an angle $\theta$ with the horizontal such that $\tan \theta = 2\mu$,then the ratio $F_1 / F_2$ is

$Ni$ anode is used in the electrolytic extraction of

The locus of $z$ satisfying the inequality $\left|\frac{z+2 i}{2 z+i}\right| < 1$,where $z=x+i y$,is

The atomic weights of two elements $A$ and $B$ are $40$ and $80$ respectively. If $x \ g$ of $A$ contains $y$ atoms,how many atoms are present in $2x \ g$ of $B$?

$CrO_3$ dissolves in aqueous $NaOH$ to give: