Which of the following halogen oxides is ionic?

$A$ given system undergoes a change in which the work done by the system equals the decrease in its internal energy. The system must have undergone an

An ion $M^{2+}$ forms the complexes $[M(H_2O)_6]^{2+}$,$[M(en)_3]^{2+}$,and $[MBr_6]^{4-}$. Match the complex with the appropriate colour.

The angular magnification of a simple microscope can be increased by increasing

If $\alpha, \beta, \gamma$ are the roots of $x^3-2x^2+3x-4=0$,then the value of $\alpha^2\beta^2+\beta^2\gamma^2+\gamma^2\alpha^2$ is

In the given figure, the magnetic field at the centre will be: