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Answer the following questions pertaining to the brown ring test for nitric acid : State why the unstable brown ring decomposes completely on disturbing the test tube .

Answer the following questions pertaining to the brown ring test for nitric acid : Give a reason why the brown ring does not settle down at the bottom of the rest tube.

Study the experimental set-up given below and answer the following questions: Name the liquid filled in the test tube. Explain how the above mentioned chemical would interfere with the experiment.

An instructor has a test bank consisting of 300 easy True/False questions, 200 difficult True/False questions, 500 easy multiple choice questions (MCQ) and 400 difficult multiple choice questions. If a questions is selected at random from the test bank, what is the probability that it will be an easy question given that it is a multiple choice question.

In an entrance test, there are multiple choice questions. There are four possible answers to each question, of which one is correct. The probability that a student knows the answer to a question is 90%. If the gets the correct answer to a question, then find the probability that he was guessing.

In an entrance test, there are multiple choice questions. There are four possible answers to each question, of which one is correct. The probability that a student knows the answer to a question is 90%. If the gets the correct answer to a question, then find the probability that he was guessing.

There are 180 multiple choice questions in a test. If a candidate gets 4 marks for every correct answer and for every unattempted or wrongly answered question one mark is deducted from the total score of correct answers. If a candidate scored 450 marks in the test, how many questions did he answer correctly?