A drop of solution (volume 0.05mL) contains 3.0×10−6 moles of H+ ions. If the rate constant of disappearance of H+ is 1.0×107mollitre−1sec−1, how long would it take for H+ in drop to disappear?
A
6×10−7s
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B
6×10−9s
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C
6×10−10s
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D
6×10−8s
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Solution
The correct option is B6×10−9s The concentration of drop is given by Conc.=mole ×1000volume (in mL)=3×10−6×10000.05=0.06mol L−1
Given,
rate constant, k=1.0×107mol L s−1
Thus it is a zero order reaction.
For a zero order reaction, t=xk=0.06mol L−11.0×107mol L s−1=6×10−9s