What planet is covered in toxic clouds and is the driest and Rockies planet?

The planet you are referring to is Venus. It is enveloped in thick, toxic clouds primarily composed of sulfuric acid, which contribute to its extreme greenhouse effect, making it the hottest planet in the solar system. Additionally, Venus has very little water, making it one of the driest planets. Its harsh surface conditions are a result of both the intense atmospheric pressure and high temperatures.