Q 15 and 16 Q.15. Why did gold and platinum always exist in free state? Q.16. A metal is found to be present in vitamin B-12. Name the metal. Share with your friends Share 0 Prateek Grover answered this 1 View Full Answer Dhanvi answered this Q15. because they are least reactive and do not react with any gas to form oxides ,etc. -1 Aryan Bindal answered this Question 15. As they are least reactive metals and don't react with any non metal in free conditions. 0 Aryan Bindal answered this Question 16. Metal is Cobalt(Co) 0
