The optimal strength of ethanol for instrument disinfection and storage is:
a. 50%. c. 95%.
b. 70%. d. 10%.
ANS: A
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A Correct: Fifty percent concentration of ethanol appears to be a more effective germicide (than 70%), when long contact can be maintained.
B Incorrect: This is most appropriate for rapid skin disinfection.
C Incorrect: This is not an appropriate concentration.
D Incorrect: This is not an appropriate concentration.
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