Question

Conc. ${{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}$ reacts with carbon and forms:
A.$C{O_2}$
B.$S{O_2}$
C.${H_2}C{O_3}$
D.${H_2}S{O_3}$

Answer 1

Hint: Sulfuric acid, commonly known as oil of vitriol, is a mineral acid with the chemical formula ${{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}$ and is made up of the elements sulphur, oxygen, and hydrogen. It's a colourless, odourless, viscous liquid that's water miscible. Because it is an oxidant and has a strong acidic character, the acid in its pure form is very corrosive to other materials.

Complete answer:
Furthermore, pure acid is very dehydrating, meaning it will remove water from a wide range of things when it comes into contact with them. Phosphorus pentoxide, on the other hand, is capable of dehydrating sulfuric acid to sulphur trioxide. Sulfuric acid is also hygroscopic, meaning it can collect water vapour from the air easily. When sulfuric acid is added to water, a large amount of heat is produced. As a result, the practise of adding water to concentrated sulfuric acid solutions in reverse should be avoided. The heat produced may cause the solution to boil, spewing hot acid droplets in the process.
Sulfuric acid interacts with carbon to generate carbon dioxide and sulphur dioxide gas, as well as water. A concentrated, heated solution of sulfuric acid should be used. Carbon (as bituminous coal) and sulphur are oxidised by hot concentrated sulfuric acid. Concentrated sulfuric acid is an oxidising acid that may convert sulfuric acid to sulphur dioxide while oxidising carbon to carbon dioxide. Because the oxidation numbers of carbon and sulphur atoms change, this is a redox process.
Colorless carbon dioxide gas is produced when carbon is oxidised. Carbon oxidation number is increased from 0 to +4. Sulfuric acid is converted to a colourless gas called sulphur dioxide. Sulfur's oxidation number is lowered from +6 to +4.
\[C{\text{ }} + {\text{ }}2{\text{ }}{H_2}S{O_4}\;\xrightarrow{\Delta }{\text{ }}C{O_2}\; + {\text{ }}2{\text{ }}S{O_2}\; + {\text{ }}2{\text{ }}{H_2}O\]
Hence option A and B are correct.

Note:
Due to its high affinity for water, pure sulfuric acid does not occur naturally on Earth in anhydrous form. Acid rain contains dilute sulfuric acid, which is generated when sulphur dioxide is oxidised in the presence of water in the atmosphere, resulting in sulphurous acid oxidation. Sulfur dioxide is the principal byproduct of burning sulfur-containing fuels like coal or oil (besides the chief products carbon oxides and water).