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A vessel at 1000 K contains CO 2 with a pressure of 0.5 atm. Some of CO 2 is converted into CO on addition of graphite. If total pressure at equilibrium is 0.8 atm, then KP is :

1. 0.18 atm
2. 1.8 atm
3. 0.3 atm
4. 3 atm

Correct answer: 1.8 atm

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