Things which render the Salaah Makrooh

Q: What is the ruling on a muqtadi repeatedly clearing his throat during ṣalaah without need, where no audible words are formed—does it nullify the prayer?

Q: What should be done if one prayed while needing to urinate/defecate, wants to pray the same salah again after relieving himself, but a disliked time for salah (asr, fajr) is going to enter? 

Should one repeat the prayer during the disliked time anyway?

Q: Does clearing the throat unnecessarily break ones Salaah?

Q: Is it permissible to pray in front of a poster of the Kabah with people doing tawaaf and will my salaah be valid? What is the ruling in praying in front of a poster of the Kabah with human figures?

Q: Is it permissible to read salah on a musallah which has a picture of the clock tower on it where you are making sajda on the clock part?

Q: After getting up from ruku in the standing position, if someone uses both his hands for handling clothes or scarf (removes both the hands from the side of body), does salah become invalid?

Q: If a person prays while wearing a t-shirt that has depictions of creatures on it, is his prayer valid or should he repeat it?

Q: Can I perform namaz with a face mask?

Q: Prayers are offered in Masajid these days with distances between musallees being about one meter and leaving the alternate saff empty. Also, we need to wear a thin mask during prayers. This way the nose does not get in contact with the ground.

1. Are our prayers valid with distances in between?

2. Are our prayers valid with a face mask on? 

Q: Is it permissible to perform salaah with a mask on?