A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of the CO2 is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of K is

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A vessel at 1000 K contains CO₂ with a pressure of 0.5 atm. Some of the CO₂ is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of K is

0.18 atm

1.8 atm

3 atm

0.3 atm

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An acid HA ionises as

HA ⇌ H⁺ + A^–

The pH of 1.0 M solution is 5. Its dissociation constant would be

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