If a polygon of $n$ sides has $275$ diagonals,then $n$ is equal to

Which one of the following is the correct order of the second ionisation potential of $Na, Ne, Mg$ and $Al$?

If $\alpha \neq \beta$ but $\alpha^2 = 5\alpha - 3$ and $\beta^2 = 5\beta - 3$,then the equation whose roots are $\frac{\alpha}{\beta}$ and $\frac{\beta}{\alpha}$ is:

What are $X$ and $Y$ in the following reaction sequence?
$C_2H_5OH$ $\xrightarrow{Cl_2} \underline{X}$ $\xrightarrow{Cl_2} \underline{Y}$

Hairs of a shaving brush cling together when it is removed from water due to:

Nitrobenzene gives $N$-phenylhydroxylamine by