An example of a double salt is

$A$ 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

Which one of the following orders is correct for the first ionisation energies of the elements?

The set $\{x \in R: \cos 2x + 2 \cos^2 x = 2\}$ is equal to

Which of the following is not optically active?

Magnesium wire is heated in the atmosphere of $CO_2$ because