What is the ratio of the rate of diffusion of oxygen $(O_2)$ and hydrogen $(H_2)$?

What is $X$ in the following reaction?
$MgCl_2 + 2H_2O \to X + 2HCl + H_2$

Which of the following is a non-living level of biological organization?

The number of oxygen atoms bonded to one phosphorous atom in $P_4O_6$ is

Identify the equivalent logic gate for the following circuit.

$A$ particle performs linear $SHM$. At a particular instant,the velocity of the particle is $u$ and acceleration is $\alpha$ (both having the same direction). At another instant,the velocity is $v$ and acceleration is $\beta$ $(0 < \alpha < \beta)$ (both in opposite directions to each other). The distance between the two positions is