Which of the following is a prokaryotic kingdom?

Which property of alkaline earth metals increases with their atomic number?

The number of sigma $(\sigma)$ and pi $(\pi)$ bonds present in benzene respectively are:

If $f(x) = x^3 - 6x^2 + 9x + 3$ is a decreasing function,then $x$ lies in

$A$ choke coil works on the principle of

$Fe_2Cr_2O_4 + Na_2CO_3 + O_2$ $\xrightarrow{\text{Fusion}} [X]$ $\xrightarrow[H_2O]{H^+} [Y]$ $\xrightarrow{H_2O_2/H^+} [Z]$
Which of the following statements is true for the compounds $[X], [Y]$ and $[Z]$?