Nothing happens actually except an increase in citation count for the author within google scholar. Unfortunately, this is how the system works.

Binaya - you are at liberty to cite whatever you wish from the public domain. However, there are considerations for 'credibility' - such as 'do you know it is a predatory journal?' If so - 'is there no alternative source that you could use?' Another consideration is 'what is the quality of the article - have you critically appraised it?' You could justify using the citation if it was of 'reasonable' quality and there were no alternatives. Otherwise, you could be challenged on using material that helps perpetuate and support predatory journals.

As along as you are satisfied with the quality of the content you can cite it. However, look for more credible sources, if available.

Nothing happens actually except an increase in citation count for the author within google scholar. Unfortunately, this is how the system works.

A best way to consider citations from well known and authentic published materials. Preferred option is to get citations from high quality journals, conference, workshops or books. If you know that some citation or reading scripts, materials belong to suspicious or predatory sources, please do not pollute your research and mind. Prevention from academic corrupt practices is the only best choice of solution for fair progress.

Usually, the editors of high quality journals verifying all the citations as well. If such things exists in the ongoing manuscripts for publication they will remove it., Alternatively, they will prompt you to remove it before its publication.

I am grateful to all for your wonderful responses.

If you are sure that the journal in question is a predatory one, refrain from citing it.

A recent article from Nature is helpful to wean predatory journals. Use the following link: https://www.nature.com/magazine-assets/d41586-019-03759-y/d41586-019-03759-y.pdf