Question

Venus is hotter than mercury even though it is far from sun than mercury

Answer 1

because too many gasses are present in Venus and gasses absorb heat of sun and so Venus is more hotter than mercury

Answer 2

The reason of this is that the atmosphere of mercury is very thin and most of the heat of the sun is reflected back. Whereas the atmosphere of Venus has a large amount of carbon dioxide and it, being a greenhouse gas, absorbs most of the heat by the sun and hence it is hotter than mercury even though mercury is closer to the sun as compared to venus.