Which of the following is not considered as an organometallic compound?

$A$ bag $X$ contains $2$ white and $3$ black balls and another bag $Y$ contains $4$ white and $2$ black balls. One bag is selected at random and a ball is drawn from it. Then, the probability for the ball chosen to be white is:

The complex $[Pt(py)(NH_3)(Br)(Cl)]$ will have how many geometrical isomers?

In the circuit shown in the figure,the potential difference between points $A$ and $B$ is $16 \, V$. The current passing through the $2 \, \Omega$ resistance will be ................. $A$.

Which of the following substances would quickly absorb oxygen?

The following compounds have been arranged in order of their increasing thermal stabilities. Identify the correct order :
$K_2CO_3(I), MgCO_3(II), CaCO_3(III), BeCO_3(IV)$