A hydrogen chloride gas reacted with oxygen gas to yield water and chlorine gas. The mole ratio of the hydrogen chloride gas to water is?

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A. 1:3
B. 2:1
C. 3:1
D. 4:1

Correct Answer:

Option B = 2:1

Explanation

4HCl + O2 — 2Cl2 + 2H2O
4:2 = 4/2
2:1

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