Which of the following compounds has the highest boiling point?

The spin magnetic moment of cobalt in the compound $Hg[Co(SCN)_4]$ is

An electron moves with speed $2 \times 10^5 \ m/s$ along the positive $x$-direction in the presence of a magnetic induction $\vec{B} = \hat{i} + 4\hat{j} - 3\hat{k}$ (in $Tesla$). The magnitude of the force experienced by the electron in Newtons is (charge on the electron = $1.6 \times 10^{-19} \ C$).

Which of the following anthropogenic actions leads to evolution?

Differentiate the function with respect to $x$: $\sec (\tan (\sqrt{x}))$

$A$ roller coaster is designed such that riders experience "weightlessness" as they go round the top of a hill whose radius of curvature is $20 \, m$. The speed of the car at the top of the hill is between