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Q.

Contact process is used in the formation of sulphur trioxide, $2 {SO}_{2} (g) + O_{2} (g) ⇌ 2 {SO}_{3} (g)$
The rate of reaction can be expressed as $\frac{- Δ [O_{2}]}{Δt} = 2 .5 \times 10^{- 4} mol L^{- 1} s^{- 1}$
Then rate of disappearance of [SO₂] will be

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a

$50 .0 \times 10^{- 5} mol L^{- 1} s^{- 1}$

b

$3 .75 \times 10^{- 4} mol L^{- 1} s^{- 1}$

c

$2 .5 \times 10^{- 4} mol L^{- 1} s^{- 1}$

d

$4 .12 \times 10^{- 4} mol L^{- 1} s^{- 1}$

answer is A.

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Detailed Solution

$\frac{- Δ [{SO}_{2}]}{Δt} = 2 (- \frac{Δ [O_{2}]}{Δt})$
$∴ \frac{- Δ [{SO}_{2}]}{Δt} = 2 \times 2 .5 \times 10^{- 4} mol L^{- 1} s^{- 1}$
$\begin{array}{l} = 5 .0 \times 10^{- 4} mol L^{- 1} s^{- 1} \\ = 50 .0 \times 10^{- 5} mol L^{- 1} s^{- 1} \end{array}$

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Contact process is used in the formation of sulphur trioxide, 2SO2(g)+O2(g)⇌2SO3(g)The rate of reaction can be expressed as −ΔO2Δt=2.5×10−4mol L−1s−1Then rate of disappearance of [SO2] will be