Question

Identify A, B, C, and D in the following flowchart:

• A. A: Coke; B: $CO$​; ​C: $H_2$; D: ${CO}_2$
• B. A: Graphite; B: $H_2$; ​C: $CO$; D: ${CO}_2$
• C. A: Graphite; B: $O_2$; ​ C: ${CO}_2$; D: $CO$​​
• D. A: Coke; B: ${CO}_2$; ​C: $H_{2}O$; D: $CO$​

Answer 1

The correct option is A

A: Coke; B: $CO$​; ​C: $H_2$; D: ${CO}_2$

Coke is an amorphous form of carbon. So, A is coke.
When it reacts with steam it forms carbon monoxide and hydrogen. Hydrogen gas burns with a pop sound so C is $H_2$ and B is CO.
When coke reacts with air, it produces carbon dioxide, which turns lime water milky so D is ${CO}_2$.

Therefore, the correct answer is option (c).