question_answer

Which of the following reactions will evolve CO(g).

(i) \[{{K}_{4}}Fe{{(CN)}_{6}}+Conc.\,\,{{H}_{2}}S{{O}_{4}}\xrightarrow[{}]{\Delta }\]

(ii) \[Ni{{(CO)}_{4}}\xrightarrow[{}]{\Delta }\]

(iii) \[Zn+C{{O}_{2}}\xrightarrow[{}]{\Delta }\]

(iv) \[MgC{{O}_{3}}+Zn\xrightarrow[{}]{\Delta }\]

A) All the above

B)  One (i)

C) (i) & (ii)            

D) none of these