સંપર્ક પદ્ધતિ દ્વારા સલ્ફર ટ્રાયોક્સાઇડના સર્જનની પ્રક્રિયા \(2S{O_2} + {O_2} \rightleftharpoons 2S{O_3}\) માં પ્રક્રિયાનો વેગ \(\frac{{d\left[ {{O_2}} \right]}}{{dt}} = - 2.5 \times {10^{ - 4}}\,mol\,{L^{ - 1}}\,{s^{ - 1}}\) તરીકે માપવામાં આવ્યો. તો \([SO_2]\) તી સાંદ્રતાના સંદર્ભમાં \(mol\,L^{- 1}\, s^{-1}\) માં પ્રક્રિયાવેગ શુ થશે ?

A \(- 1.25\times10^{-4}\)
B \(- 2.50\times10^{-4}\)
C \(- 3.75\times10^{-4}\)
D \(-5.00\times10^{-4}\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(-5.00\times10^{-4}\)

Step-by-step Solution

Detailed explanation

From rate law \( - \frac{1}{2}\frac{{dS{O_2}}}{{dt}}\, - \,\frac{{d{O_2}}}{{dt}} - \frac{1}{2}\frac{{dS{O_3}}}{{dt}}\) \(\therefore \,\,\frac{{dS{O_2}}}{{dt}}\, = -\,2 \times \frac{{d{O_2}}}{{dt}}\) \(=\,-\,2\times 2.5\times 10^{-4}\)…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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