Hazard and Operability (HAZOP) technique is the best step for identification and analyzing the hazard and operational issues of the system. It is very organized, methodical and structured process to identify hazards of any system or process from the initiating stage till decommissioning of the project. Technology and system possess exposure to undesired events because the system can fail or improper work resulting in injury, damage, and deaths. Our lives are dealing with a web of different systems, each of which can affect our safety. Each of these systems contains inherent hazard that presents unique risk. The major concerned is about eliminating and reducing risk which leads to undesired events. This paper discusses the hazard analysis through HAZOP technique done on a chemical mixing process producing 10% HCL as a final product and all the possible consequences arising from the deviation is identified using several guide words. The result of Hazard identification helps to suggest the control measures in order to prevent deviation and to avoid the consequences. HAZOP technique provides clear and detailed analysis of hazard associated with the process and results are easy to understand.