A --High T & P--> 3B is a first order reaction. If A is a strong monoprotic acid and B is strong dip — AITS & Test Series Chemistry Question

Question

A --High T & P--> 3B is a first order reaction. If A is a strong monoprotic acid and B is strong diprotic acid and reaction kinetic is studied by using a standard solution of NaOH required to neutralise reaction mixture at different instant of time, when initially we had taken some concentration of A. Now, it was observed that volume required after 970 sec was double that required initially, then half life of reaction is