Which of the following is an accessory whorl of a flower?

The complete set of values of $x$ for which the function $f(x) = 2 \log_e(x-2) - x^2 + 4x + 1$ is increasing is:

The total number of $\sigma$ and $\pi$-bonds in pyrophosphoric acid are respectively

What is obtained when one mole of calcium phosphide is reacted with excess water?

The electronic configurations of $Eu$ (Atomic No $63$),$Gd$ (Atomic No $64$) and $Tb$ (Atomic No $65$) are

$A$ metal crystallises in a face-centred cubic $(FCC)$ structure. If the edge length of its unit cell is '$a$',the closest approach between two atoms in the metallic crystal will be: