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Read the following information carefully to answer the questions that follow. In a survey of 25 students, it was found that 15 have taken Mathematics. 12 have taken Physics and 11 taken Chemistry, 5 have taken Mathematics and Chemistry, 9 have taken Mathematics and Physics, 4 have taken Physics and Chemistry and 3 have taken all the three subjects. The number of students who have taken only Physics, is (a)2 (b)3 (c)5 (d)6

The students of class IX have made placards showing the symbols of some elements and valencies of these elements. These placards somehow got mixed up as shown below : On this basis of these placards the chemistry teacher, Mrs. Shanti, asked a student Vikas to answer the following questions : (a) Choose the symbol of an element from among the placards which exhibits valencies of 3 and 5. What is the name of is the name of this element ? Is it a metal or a non-metal ? (b) Choose the symbol of an element from the given placards which shows a valency of 2. What is the name of this element ? Is it a metal or a non-metal ? (c) Work out the formula of the compound formed between the element of valency 3 and element of valency 2. Also name this compound (d) What values are displayed by Vikas in this episode ?

These questions are based on the following diagram: In the above figure, the Triangle represents the students who passed in Physics, the Rectangle represents the students who passed in Chemistry and the Circle represents the students who passed in Mathematics in a class. How many students passed in Chemistry but not in Mathematics? 1) 22 2) 11 3) 18 4) 17 5)23