Is buying and storing gold bars for profit permissible or prohibited?
                                Buying and storing gold bars for profit is permissible, and there is no harm in it. And Allah The Almighty Knows Best.
                             
                        
                            
                                
                                Should nail polish be removed before making ablution?
                                Yes, it should be removed because it prevents water from reaching the nails.
                             
                        
                            
                                
                                An Imam stood to offer a fifth Rak`ah in a four-Rak`ah prayer, and he was reminded to sit by those behind him, but he wouldn`t listen. What is the ruling on those who followed his lead knowingly and intentionally?
                                If the Imam stood to offer a fifth Rak`ah, those praying behind him shouldn`t have approved of that, and the prayer of those who did is considered null and void.
                             
                        
                            
                                
                                My headcloth is causing me a terrible headache and severe shortsightedness. Is it permissible for me to take it off?
                                All perfect praise be to Allah, the Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad, sallallahu ‘alayhi wa sallam, is His slave and Messenger.
If the headcloth Khimar is harmful, it is sufficient to wear the Niqab (face-veil). However, with the passage of time you will get used to the Khimar and these symptoms will go away. And Allah The Almighty Knows Best.