Most people have a viewpoint that employees must have some moral obligations to stay loyal to their organizations. It is true that employees are obligated to do the tasks offered to them, but is it acceptable to have an obligation to work for the company in a manner that is beyond the assigned jobs?

Many employers may think so, but is not mentioned anywhere. The employees are not bound or obligated to have any kind of loyalty to the employers. But on a moral ground, loyalty to the company is often considered to be a good thing and it is plausible that the loyalty is rewarded through pay-raises, promotions, and good recommendations etc.