Q101 · CSIR-NET Chemistry, June 2015
Paper: CSIR-NET June 2015 · Subject: Physical Chemistry · Chapter: Surface Chemistry · Topic: Surface Chemistry – General · Marks: 2 · Difficulty: Easy
For a reaction on a surface 
At low pressure of H, the rate is proportional to
At low pressure of H, the rate is proportional to(a)$\mathrm{H}_{2}$
(b)$1 / \mathrm{H}_{2}$
(c)$\mathrm{H}_{2}{ }^{1 / 2}$
(d)$1 /\left[\mathrm{H}_{2}\right]^{1 / 2}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
H₂ adsorbs dissociatively, θ ≈ (Kp)^½ at low pressure, so the rate ∝ p(H₂)^½.
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