@Mithoron Ok :). But in my book (Solomons) it is given superimposable is different concept and superposable is the more appropriate one for chirality check. That's why I made the edit to the post. Even IUPAC's gold book -
see this - uses the term superposable in place of superimposable. The latter term is just imposing the compounds, but the former means imposing and comparing the arrangement of atoms around the chirality centre.