Venus.
Venus' atmosphere consists mostly of carbon dioxide, with clouds containing of sulfuric acid. There are also compounds of chlorine and fluoride.
That sounds like a description of Venus.
It's rocky, but it has an atmosphere made up mostly of carbon dioxide and has clouds made of sulfuric acid.
Your thinking of Venus which does have a high Co2 atmosphere and sulphuric rain. Mars has very little atmosphere.
Venus' atmosphere is mostly carbon dioxide (this is what we breathe out) and the rest is mostly nitrogen. There is a very thick layer of poisonous clouds covering the entire planet. These clouds are made up of sulfuric acid droplets. (The clouds on earth are made up of water droplets.)
Venus has an atmospheric pressure about 90 times that of earth. It is mostly carbon dioxide with sulfuric acid clouds. It's temperature is over 400 degrees.
Venus is the hottest planet. Its average surface temperature is 464 degrees Celsius. Its atmosphere has thick, pale, yellow clouds of carbon dioxide and sulfuric acid.
Venus is a planet that has a smooth unmarked surface caused by a thick protective atmosphere. The atmosphere of Venus is mostly carbon dioxide, which is surrounded by sulfuric acid clouds.
Atmosphere is made up of mostly carbon dioxide and nitrogen with traces of other dangerous and rather poisonous gases. Also with clouds of sulfuric acid make earth-like life impossible.
Venus
Venus is covered with clouds It's atmosphere is 92% carbon dioxide, 3% nitrogen, and there are small amounts of water vapor, argon, carbon monoxide, neon, and sulfur vapor. Venus is covered by clouds of sulfuric acid. The sulfuric acid rains down to Venus, but evaporates before touching the ground.
Venus' atmosphere is 96.5% carbon dioxide and 3.5% nitrogen. There are heavy clouds of sulfur dioxide and sulfuric acid. The runaway greenhouse effect that results causes the temperature to be 860 F, making Venus the hottest planet in the Solar System.