The correct option is(D): - 2 and - 1.
The reaction involved is \(BaO_2 + H_2SO_4 \rightarrow BaSO_4 + H_2O_2\) The most electronegative atom, oxygen, in \(BaSO_4\) and
\(H_2O_2\) has - 2 and - 1 oxidation state respectively.
Ion having highest hydration enthalpy among the given alkaline earth metal ions is:
Two identical concave mirrors each of focal length $ f $ are facing each other as shown. A glass slab of thickness $ t $ and refractive index $ n_0 $ is placed equidistant from both mirrors on the principal axis. A monochromatic point source $ S $ is placed at the center of the slab. For the image to be formed on $ S $ itself, which of the following distances between the two mirrors is/are correct: