Identify A, B, C, and D in the following flowchart:
A
A: Coke; B: CO; C: H2; D: CO2
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B
A: Graphite; B: H2; C: CO; D: CO2
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C
A: Graphite; B: O2; C: CO2; D: CO
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D
A: Coke; B: CO2; C: H2O; D: CO
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Solution
The correct option is A
A: Coke; B: CO; C: H2; D: CO2
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 H2 and B is CO.
When coke reacts with air, it produces carbon dioxide, which turns lime water milky so D is CO2.