The cyclotron frequency of an electron gyrating in a magnetic field of $1\, T$ is approximately

What are the metal ions present in carnallite?

If $y=y(x)$ is the solution of the differential equation $\left(\frac{2+\sin x}{y+1}\right) \frac{d y}{d x}+\cos x=0$ with $y(0)=1$,then $y\left(\frac{\pi}{2}\right)$ is equal to

The area (in square units) of the region bounded by the curves $x=y^2$ and $x=3-2y^2$ is

Among the following compounds $(I-III)$,the correct order of reactivity towards electrophilic substitution is:

The ratio of anion radius to cation radius of a crystal is $10: 9.3$. Then,the coordination number of the cation in the crystal is