Can you find number?/I.Q test

Can you find a rational number whose multiplicative inverse is -1?

Can you find the smallest number that can be multiplied to 1620 to get a perfect square?

Can you find at least one vector perpendiculr to 3hat(i)-4hat(j)+7hat(k) ?

Consider the marks obtained by 10 students in a mathematics test as given below: 55369573604225787562 The data in this form is called raw data.By looking at it in this form, can you find the highest and the lowest marks?

I am the smallest number,having four different prime factors.Can you find me?

(a) Why have primary amines higher boiling point than tertiary amines? (b) How can you find out whether a given amine is a primary amine? Write the chemical reaction involved in the test you perform.

If P = {a, e,i,o, u} and Q = {2, 4, 6, 8, 10}, then find the number of elements in P xx Q .