Oxidation number of $P$ in $Mg_2P_2O_7$ is

If $l_1 = \lim_{x \rightarrow 2^{+}} (x + [x])$,$l_2 = \lim_{x \rightarrow 2^{-}} (2x - [x])$ and $l_3 = \lim_{x \rightarrow \pi / 2} \frac{\cos x}{x - \pi / 2}$,then:

During which phase of the cell cycle are the proteins and microtubules required for mitosis synthesized?

Calculate the strength of $20 \, V \, H_2O_2$ in $g/L$.

The binding energy per nucleon of $^{16}O$ is $7.97 \, MeV$ and that of $^{17}O$ is $7.75 \, MeV$. The energy (in $MeV$) required to remove a neutron from $^{17}O$ is:

Heating $(NH_4)_2Cr_2O_7$ liberates a gas. The same gas is obtained by: