NEET2026ChemistryChapterActual
For the given hypothetical reaction: 2 P + 5 Q 3 R + 4 S The rate of disappearance of P is 4 10⁻³ ~mol ~L ⁻¹ ~s ⁻¹ . The overall rate of the reaction and the concentration of S formed in an interval of 20 seconds will be, respectively:
Options
- A4 10⁻³ ~mol ~L ⁻¹ ~s ⁻¹ and 32 10⁻² ~mol ~L ⁻¹
- B2 10⁻³ ~mol ~L ⁻¹ ~s ⁻¹ and 16 10⁻² ~mol ~L ⁻¹
- C2 10⁻³ ~mol ~L ⁻¹ ~s ⁻¹ and 4 10⁻² ~mol ~L ⁻¹
- D8 10⁻³ ~mol ~L ⁻¹ ~s ⁻¹ and 64 10⁻² ~mol ~L ⁻¹
Correct answer
B. 2 10⁻³ ~mol ~L ⁻¹ ~s ⁻¹ and 16 10⁻² ~mol ~L ⁻¹
Step-by-step solution
For the given reaction 2 P + 5 Q 3 R + 4 S , the overall rate of reaction is given by: Rate = - 1 2 d[ P ] dt = 1 4 d[ S ] dt Given the rate of disappearance of P is - d[ P ] dt = 4 10⁻³ ~mol ~L ⁻¹ ~s ⁻¹ . The overall rate of the reaction is: Rate = 1 2 (4 10⁻³) = 2 10⁻³ ~mol ~L ⁻¹ ~s ⁻¹ The rate of formation of S is: d[ S ] dt = 4 Rate = 4 (2 10⁻³) = 8 10⁻³ ~mol ~L ⁻¹ ~s ⁻¹ The concentration of S formed in an interval of 20 seconds is: [ S ] = d[ S ] dt t = (8 10⁻³) 20 = 160 10⁻³ = 16 10⁻² ~mol ~L ⁻¹ Answer: 2 10⁻