Zakat can be given to eight categories mentioned in the Quran: the poor (Fuqara), the needy (Masakin), Zakat collectors, those whose hearts are to be reconciled, slaves seeking freedom, debtors, those fighting in Allah's cause, and travelers in need.

Yes, Zakat can be given to eligible relatives who fall under the eight categories, except direct descendants (children, grandchildren) and ascendants (parents, grandparents). Giving to eligible relatives is actually preferred as it combines charity with maintaining family ties.

Zakat cannot be given directly to institutions like hospitals or schools. It must be given to eligible individuals from the eight categories. However, you can give Zakat to poor patients for their medical expenses or to needy students for their education costs.

According to the majority of Islamic scholars, Zakat should primarily be given to Muslims. However, there are scholarly opinions that allow giving Zakat to non-Muslims in certain circumstances, particularly to those whose hearts are to be reconciled to Islam or in cases of extreme need.

No, Zakat cannot be used for building mosques, schools, or other public infrastructure. Zakat must be given to eligible individuals from the eight categories specified in the Quran. For mosque construction, use other forms of charity like Sadaqah or Waqf.