{:(,"Column I",,"Column II"),((A),"An element with +1 stable oxidation state",(p),"lead"),((B),"A neutral oxide",(q),"Dry ice"),((C),"An element with stable +2 oxidationstate",(r),"Thallium"),((D),"Solid carbon dioxide",(s),"Carbon monoxides"):}

{:(,"Column I",,"Column II"),((A),"An element with +1 stable oxidation

1.	{:(,"Column I",,"Column II"),((A),"An element with +1 stable oxidation state",(p),"lead"),((B),"A neutral oxide",(q),"Dry ice"),((C),"An element with stable +2 oxidationstate",(r),"Thallium"),((D),"Solid carbon dioxide",(s),"Carbon monoxides"):}
Answer» A-p,B-q,C-r,D-s A-r,B-s,C-p,D-q A-r,B-p,C-q,D-s A-q,B-s,C-r,D-p Answer :B