(a) Name one metal in each case Which:

(i) exists as a liquid at room temperature,

(ii) can be found in nature in the uncombined state

 

(b) X and Y are 0.5 mol. dm\(^{-3}\) freshly prepared aqueous solutions of two salts of iron

(II) With excess sodium hydroxide solution, X gave a dirty green precipitate which was not obtained in the case of Y.