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I) It is a high class chemical laboratory where concentrated strong acids are used. Suresh needed a test tube. Lab attender advised him to clean a test tube and take it. He is afraid to wash. He wanted to know whether any harmful acid is already there or not. What do you suggest he do?
II) Arun is thinking about a chemical which is used to check whether a solution is acid or base. They are indicators. Which of the following is not an indicator?
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