Venus
The planet Venus is completely covered with clouds. The clouds are comprised of sulfuric acid, which traps in the atmosphere and heat.
Mars is the terrestrial planet with a thin carbon dioxide atmosphere. Venus also has an atmosphere of carbon dioxide, but it is very thick.
Such an atmosphere on a planet would be the result of carbon dioxide emitted from volcanoes.
Venus has the thickest carbon dioxide atmosphere.
Earth, Mars and venus all have nitrogen and Carbon dioxide in their atmosphere, though the levels vary from planet to planet.
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That sounds like a description of Venus.
The planet Venus is completely covered with clouds. The clouds are comprised of sulfuric acid, which traps in the atmosphere and heat.
Venus
Venus is covered in acid clouds.
The atmosphere of Venus is made up of primarily of carbon dioxide. Thick clouds of sulphuric oxide and carbon dioxide completely cover the planet.
Presuming you mean which planet has carbon dioxide as the primary component of its atmosphere, and features clouds of sulfur dioxide (or sulfuric acid), which would be Venus, second planet from the Sun (the next innermost planet from the sun compared with earth).
Venus has an atmosphere of 96% carbon dioxide. It is also completely covered with clouds consisting of droplets of concentrated sulphuric acid. These cloud tops also show traces of sulphur dioxide, solid sulphur and chlorine. The surface temperature is 460oC (860oF).