Given that the equilibrium constant for the reaction, 2 SO_2(g)+ O_2(g) ⇌ 2 SO_3(g) has a value of 278 at a particular temperature. What is the value…
NEET UG 2012 — Chemistry Physical Chemistry
2012mcqmedium
Given that the equilibrium constant for the reaction, 2SO2(g)+O2(g)⇌2SO3(g) has a value of 278 at a particular temperature. What is the value of the equilibrium constant for the following reaction at the same temperature? SO3(g)⇌SO2(g)+21O2(g)
Official previous-year question
Held on 30 Apr 2012 · Verified 9 Jul 2026.
Options
A
1.8×10−3
B
3.6×10−3
C
6.0×10−2
D
1.3×10−5
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Solution
2SO2(g)+O2(g)⇌2SO3(g) Equilibrium constant for this reaction, K=[SO2]2[O2][SO3]2SO3(g)⇌SO2(g)+21O2(g) Equilibrium constant for this reaction, K′=[SO3][SO2][O2]21 On squaring Eq. (ii) both sides, we have (K′)2=[SO3]2[SO2]2[O2]∴K′=K1=2781=2781=0.003597=5.99×10−2≈6×10−2
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