I am Used to _______ in queues .

I am seventh in the queue from either end. How many people are there in the queue ?

Statement : A large number of students and parents stood in the queue to collect forms for admission to various undergraduate courses in the college. Assumptons : I. The college authority may be able to admit all those who stood in the queue. II. The college authority may have adequate number of forms for all those standing in the queue.

I am an indicator . I am used to detect the presence of oxygen . Who am I ?

I am an alkaloid. I am used in soap to cure skin diseases and allergies. Who am I?

If you are eleventh in a queue starting either end, How many are there in the queue?

I am an alkaloid. I am present in root. I am used in the treatment of snake bite. Who am I ?

In a queue I am the last person while my friend is Seventh from the front. If the person exactly between me and my friend is on the 23^(rd) position from the front, what is my position in the queue?